Lasioglossum (Dialictus) coactus

Lasioglossum (Dialictus) coactus (Cresson, 1872) Figs 9–11, 76B, 82B, 85A, 86A, 106A, 107A Halictus coactus Cresson, 1872: 254 (lectotype designated in Cresson (1916), ♀, deposited in ANSP, type no. 2123, examined). Halictus coactus – Cresson 1887: 292 (catalogue); 1916: 107 (lectotype designation). — Dalla Torre 1896: 58 (catalogue). Halictus (Chloralictus) coactus – Ellis 1914: 100, 101 (comparison to jamaicae = gemmatum and tegulare), 103 (comparison to perparvum). Lasioglossum (Chloralictus) coactum (!) – Michener 1951: 1112 (catalogue). — Scott et al. 2011: 29 (checklist). Dialictus coactus – Hurd 1979: 1965 (catalogue). — Moure & Hurd 1987: 95 (catalogue). Diagnosis Females of L. coactus have T1–T3 distinctly convex in lateral view (although not as strongly so as in the male), with apical rims strongly depressed, shiny, and impunctate or very sparsely punctate, contrasting with densely punctate discs (IS ≤ 1 PD); T3 with dense and complete subapical band of tomentum; tegula relatively small (reaching but not exceeding posterior margin of mesoscutum) and densely punctate (IS ≤ 1 PD); metapostnotum usually shiny with strong anastomosing rugae reaching posterior margin (rarely dull with fine rugae); mesepisternum imbricate with punctures often dense (IS <1 PD) but distinctly separated and round (sometimes crowded (IS = 0 PD)); and inner metatibial spur with 3–4 branches. Females of L. coactus are most similar to those of L. carlinvillense and L. tegulare, both of which have T1–T3 flat in lateral view. In addition, females of L. carlinvillense have the inner metatibial spur with only 2 branches and L. tegulare have the mesepisternum with crowded indistinct punctures (IS = 0 PD) or rugulose. Some species in the L. stictaspis species complex (particularly L. stictaspis s. str.) are also similar, but have T1–T3 flat in lateral view and more finely and sparsely punctate (IS = 1–3 PD), the mesepisternum shiny, and/or metapostnotum dull with fine, subparallel rugae. Males of L. coactus have T1–T4 very strongly convex, with abruptly depressed, shiny, impunctate apical rims contrasting with densely punctate discs (IS <1 PD); tegula relatively small (reaching but not exceeding posterior margin of mesoscutum in dorsal view), with inner posterior margin weakly concave, and somewhat densely punctate (IS ≤1 PD); and mesepisternum densely punctate (IS <1 PD). They are not likely to be confused with any other species so long as T1–T4 are visible, but specimens with broken metasomas may be indistinguishable from L. tegulare. Etymology The specific epithet ʻ coactus ʼ could be either a Latin noun (compulsion, constraint) or a perfect participle (forced, compelled). Because Cresson (1872) did not specify the intended grammar, according to Article 31.2.2 of the International Code of Zoological Nomenclature (ICZN 1999), the epithet is treated as a noun and is therefore not declinable to ʻ coactum ʼ in combination with ʻ Lasioglossum ʼ, as has been done in the past. Material examined Holotype UNITED STATES – Texas • ♀; ANSP. Other material MEXICO – Chihuahua • 1 ♀; 83 km N of Chihuahua; [29.38° N, 106.07° W]; 29 Aug. 1991; Terry L. Griswold leg.; ex Coreopsis tinctoria; BBSL849296. – Coahuila • 1 ♂; 61 mi. N of Saltillo; [26.31° N, 101° W]; elev. 853 m; 8 Sep. 1972; Byers, Thornhill leg.; SEMC • 1 ♀; San Juan de Sabinas; [27.93° N, 101.3° W]; elev. 354 m; 22 May 1952; P.S. Chrapliwy leg.; SEMC. – Hidalgo • 1 ♀; Grutas Tolantongo, 30 km NW of Cardonal (Barranco del Tolantongo); [20.65° N, 98.96° W]; elev. 1230 m; 13 Jul. 1990; Robert L. Minckley leg.; ex mimosoid legume; SEMC. – Nuevo León • 1 ♀; 12 mi. W of Linares; 24.8537° N, 99.7244° W; 21 Sep. 1974; George E. Bohart, W.J. Hanson leg.; BBSL1101070 • 1 ♀, 1 ♂; 15 mi. SW of China; [25.54° N, 99.41° W]; 19 Jul. 1954; SEMC • 1 ♀; 16 mi. S of Montemorelos; [24.96° N, 99.84° W]; 19 Jul. 1951; University of Kansas Mexico Expedition leg.; SEMC • 1 ♀; 4 km S of Linares; [24.81° N, 99.55° W]; elev. 400 m; 22 Mar. 1991; R.W. Brooks, R. Leschen leg.; ex Cercidium macrum; SEMC • 1 ♀; ibid.; 22 Mar. 1991; R.W. Brooks, R. Leschen leg.; ex yellow flower Opuntia; SEMC • 1 ♀; Ciudad Universitaria, San Nicolás de Garza, Jardin Desértico; [25.73° N, 100.31° W]; elev. 520 m; 4 Jun. 2009; Liliana Ramírez Freire leg.; LRF • 1 ♀; Ciudad Universitaria, San Nicolás de Garza, Jardin Desértico; [25.73° N, 100.31° W]; elev. 529 m; 1 Jun. 2009; Liliana Ramírez Freire leg.; ex Leucophyllum frutescens; LRF • 2 ♀♀; Parque Estatal El Cuchillo, China; [25.66° N, 99.27° W]; elev. 205 m; 27 Jun. 2009; Liliana Ramírez Freire leg.; LRF. – San Luis Potosi • 3 ♀♀, 3 ♂♂; 3.4 mi. NE of El Naranjo; [22.56° N, 99.3° W]; elev. 244 m; 5 Sep. 1962; University of Kansas Mexico Expedition leg.; SEMC • 1 ♀; Salinas; [22.63° N, 101.72° W]; Apr. 1982; R. Del Castillo leg.; SEMC • 1 ♂; Xilitla; [21.385° N, 98.975° W]; elev. 400 m; 7 Jul. 1990; Robert L. Minckley leg.; SEMC. – Tamaulipas • 1 ♂; 15 mi. N of Llera; [23.53° N, 99.03° W]; 24 Feb. 1972; F.D. Parker, D. Miller leg.; BBSL1101048 • 2 ♀♀; 3 mi. S of San Fernando; [24.8° N, 98.15° W]; 9 Jul. 1966; SEMC • 16 ♀♀; 8 mi. S of Jiménez; [24.1° N, 98.49° W]; 15 Jun. 1953; ex Parthenium hysterophorus; SEMC • 1 ♀; Antiguo Morelos; [22.55° N, 99.08° W]; elev. 300 m; 6 Jul. 1990; Ilan Yarom leg.; SEMC • 1 ♂; Forlon; [23.24° N, 98.8° W]; 30 Sep. 1938; L.J. Lipovsky leg.; SEMC • 1 ♀, 2 ♂♂; Jiménez; [24.22° N, 98.49° W]; 19 Jul. 1962; University of Kansas Mexico Expedition leg.; SEMC • 1 ♀; Matamoros; [25.87° N, 97.5° W]; 27 Sep. 1954; SEMC • 3 ♀♀, 1 ♂; Padilla; [24.05° N, 98.9° W]; 15 Jun. 1953; University of Kansas Mexico Expedition leg.; SEMC • 1 ♀; Playa Altamira; [22.4° N, 97.845° W]; 5 Jul 196?; M.S. Wasbaner, J.E. Slansky leg.; UCDC • 1 ♂; Rio Conchos, San Fernando; [24.84° N, 98.16° W]; 9 Jun. 1966; University of Kansas Mexico Expedition leg.; SEMC • 1 ♀; Tampico; [22.23° N, 97.86° W]; 27 Mar. 1951; W.P. Stephen leg.; SEMC. – Veracruz • 5 ♀♀; Llave Panuco; 22.0504° N, 98.185° W; 26 Feb. 1972; F.D. Parker, D. Miller leg.; BBSL1101039, BBSL1101040, BBSL1101041, BBSL1101042, BBSL1101043. UNITED STATES – Colorado • 1 ♀; Boulder Co., Palisades, “L. H. Can.” [Lefthand Canyon]; [40.11° N, 105.305° W]; 25 Jul. 1942; Hugo G. Rodeck leg.; ex Carduus; UCMC • 2 ♀♀; Jefferson Co.; 39.7433° N, 105.2365° W; 22 Aug. 2001; Sam W. Droege leg.; PCYU USGS-DRO 020468, USGS-DRO 020471 • 1 ♂; Las Animas Co., Model; 37.493° N, 103.8345° W; 23 Jul. 2009; J. Newton leg.; PCYU • 1 ♂; Grand Junction; [39.06° N, 108.55° W]; 4 Sep. 1938; D.E. Hardy leg.; SEMC. – Kansas • 2 ♀♀; Barber Co.; 37.0873° N, 98.379° W; 29 Apr. 2013; S. Griffin leg.; WRME. – New Mexico • 1 ♀; De Baca Co., Old Fort Sumner; [34.402° N, 104.194° W]; 17 Jun. 1999; W.F. Chamberlain leg.; ex Melilotus; TAMU-ENTO X1400068 • 1 ♀; Doña Ana Co., New Mexico State University campus; [32.28° N, 106.75° W]; elev. 1189 m; 11 Jun. 1979; G.S. Forbes leg.; ex Santolina; NMSU • 2 ♂♂; Eddy Co., Carlsbad; [32.42° N, 104.23° W]; 31 May 1979; Carrola, D.R. Delorme, Friedlander leg.; TAMU-ENTO X1365290, X1399323 • 1 ♀; Eddy Co., Carlsbad; [34.42° N, 104.23° W]; 20 May 1969; D.J. Brothers, Krueger, Charles D. Michener leg.; ex Lepidium integrifolium; SEMC • 1 ♂; Eddy Co., Pecos River at Highway 31; [32.31° N, 104.06° W]; 13 Jul. 1979; D.R. Delorme, C.P. McHugh leg.; TAMU-ENTO X1365429 • 1 ♀; Eddy Co., Rattlesnake Springs; 32.1095° N, 104.4716° W; elev. 1115 m; 18 Jun. 2010; J.D. Herndon leg.; BBSL CAVE2826 • 1 ♂; Otero Co., Alamogordo Dam; [32.93° N, 105.95° W]; 6 Jun. 1969; D. Liesnee leg.; ex Tamarix; NMSU • 1 ♀; Quay Co., Tucumcari; [35.17° N, 103.73° W]; 10 Jul. 1963; R.M. Bohart leg.; UCDC • 2 ♀♀; Sandoval Co., Corrales; [35.24° N, 106.61° W]; 23 Apr. 2000; R. Fagerlund leg.; PCYU • 2 ♀♀; 3 miles west of Cimarron, “Ovka? Kenton ”; [36.51° N, 104.97° W]; 23 Jun. 1970; D. Liesnee leg.; ex Tamarix; NMSU • 11 ♀♀; Carrizozo; [33.64° N, 105.88° W]; 9 Jun. 1950; L.D. Beamer leg.; ex Asclepias galloides; SEMC • 27 ♀♀; ibid.; 9 Jun. 1950; L.D. Beamer leg.; ex Dasylirion wheeleri; SEMC • 1 ♀; ibid.; 9 Jun. 1950; L.D. Beamer leg.; ex Marrubium vulgare; SEMC • 14 ♀♀, 5 ♂♂; ibid.; 9 Jun. 1950; L.D. Beamer leg.; ex Pyrrhopappus multicaulis; SEMC • 37 ♀♀, 1 ♂; ibid.; 9 Jun. 1950; L.D. Beamer leg.; SEMC. – Texas • 1 ♀; Anderson Co., 10 mi. SW of Elkhart; [31.52° N, 95.7° W]; 5–6 Jun. 1976; H.R. Burke leg.; TAMU-ENTO X1365914 • 1 ♀; Anderson Co., Salmon; [31.57° N, 95.5° W]; 17 May–6 Jun. 1975; H.R. Burke leg.; TAMU-ENTO X1365410 • 1 ♀; Bandera Co., 10 miles west of Medina; [29.8° N, 99.42° W]; 17 May 2004; W.F. Chamberlain leg.; TAMU-ENTO X1416743 • 1 ♀; Bastrop Co., Camp Swift; 30.2833° N, 97.3233° W; 2 May 2002; J.L. Neff leg.; ex Coreopsis basalis; CTMI 23406 • 1 ♀; Bastrop Co., Camp Swift; 30.284° N, 97.323° W; 2 Oct. 2003; J.L. Neff leg.; ex Heterotheca subaxillaris; CTMI 26042 • 1 ♀; ibid.; 2 Apr. 2004; J.L. Neff leg.; ex Ilex vomitoria; CTMI 26762 • 1 ♀; Bastrop Co., Camp Swift; 30.296° N, 97.31° W; 2 Oct. 2003; J.L. Neff leg.; ex Croptilon divaricatum; CTMI 26078 • 4 ♀♀, 1 ♂; Bastrop Co., Stengl Biological Station, 6 mi. N of Smithville; [30.09° N, 97.17° W]; 12 May 2000; J.C. Abbott, R. Caesar leg.; PCYU • 2 ♀♀; Bexar Co., Ebony Hill Research Station (Kendall residence); [29.488° N, 98.696° W]; 12 May 2003; Roy O. Kendall leg.; TAMU-ENTO X0408802.1, X0408802.2 • 1 ♀; Bexar Co., San Antonio; [29.42° N, 98.49° W]; 29 Aug. 1964; A.H. Alex leg.; ex Helianthus annuus; TAMU-ENTO X1400725 • 2 ♀♀; ibid.; 12 Jul. 2018; Richard S. Peigler leg.; ex Astrophytum myriostigma; TAMU-ENTO X1600774, X1602051 • 1 ♀; ibid.; 13 Jul. 2018; Richard S. Peigler leg.; ex Astrophytum ornatum; TAMU-ENTO X1597095 • 1 ♀; ibid.; 13 Jul. 2018; Richard S. Peigler leg.; ex Leuchtenbergia principis; TAMU-ENTO X1601105 • 1 ♀; ibid.; 14 Jul. 2018; Richard S. Peigler leg.; ex Leuchtenbergia principis; TAMU-ENTO X1599632 • 1 ♀; Bexar Co.; [29.4° N, 98.5° W]; 20 Oct. 1928; H.B. Parks leg.; TAMU-ENT

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