Megachile (Argyropile) longuisetosa, Gonzalez & Griswold

Gonzalez, Victor H. & Griswold, Terry L., 2007, A review of the North and Central American Megachile subgenus Argyropile Mitchell (Hymenoptera: Megachilidae), Zootaxa 1461, pp. 1-14 : 8-9

Megachile (Argyropile) longuisetosa, Gonzalez & Griswold , new species

( Figs. 1, 3, 4, 6–8, 12–14, 21, 22 , 25, 30, 33, 36 , 39, 42, 45, 48 )

Diagnosis. Females can be recognized by the following combination of characters: mid tarsomeres with anterodistal margin strongly acutely produced ( Fig. 1 ), mesoscutal-mesoscutellar suture with distinct pubescent fascia, T5 finely and densely punctate (<PW), and apical margin of S6 abruptly bent dorsally. Males can be distinguished by the combination of T6 with preapical carina and apical margin entire ( Fig. 33 ), S5 and S6 with simple, unmodified setae ( Figs. 30 , 39 ), and apex of gonoforceps with long setae ( Figs. 42, 45 ).

Description. Female. Body length, 11 mm; forewing length, 7.1 mm. Structure. Head 1.5 times as wide as long; inner orbits slightly converging below, upper interocular distance 1.2 times inferior interocular distance; interalveolar distance 1.4 times alveolorbital distance; interocellar distance 2.6 OD, slightly shorter than ocellocular distance; ocelloccipital distance about twice as long as OD; compound eye about 2.7 times as long as wide; maximum width of gena approximately equal to maximum width of compound eye in profile, narrower above; clypeus 2.4 times wider than long, apical margin sinuous ( Fig. 8 ); mandible as in Fig. 4 ; scape 3.2 times longer than broad, pedicel about as broad as long, F1 1.5 times longer than broad, 1.5 times longer than pedicel, only slightly longer than F2 and F3, individually, F2–F10 slightly longer than broad. Mid tarsi as in Fig. 1 ; hind tibia three times longer than broad, 1.2 times longer than hind basitarsus; hind basitarsus 2.7 times longer than broad, slightly narrower than tibia. Coloration. Black except: dark reddish brown on labrum, apical half of mandible, flagellum, tegula, all legs except for spurs; distitarsi and pretarsal claws yellowish ferruginous; wings subhyaline, veins dark brown. Pubescence. White, unless indicated otherwise. Basal half of outer surface of mandible densely covered with very short (<0.5 OD), minutely branched setae, lower margin of mandible with longer (> 2 OD) setae. Face with dense (integument barely visible), long (1– 1.5 OD), minutely branched setae; sparser on clypeus; gena with setae as on face, longest on lower gena (> 2 OD); area above ocelli and vertex with shorter (OD), sparser dark brown setae. Scape with outer surface uniformly covered (integument visible) with very short (<0.5 OD) dark brown to light ferruginous setae. Mesosoma with long (> 2 OD) setae as on face, shorter, sparser on margins of mesoscutum; disc of mesoscutum and mesoscutellum with sparse, poorly branched dark brown setae, longest (> OD) on mesoscutellum; inner surface of tarsi of all legs with light ferruginous setae; posterior margin of fore basitarsus with long setae, longer than twice width of segment. T1 with long (> 2 OD), branched setae, denser on sides; T1–T5 with apical margins densely covered with dense, appressed, very short (<0.5 OD), minutely branched setae; dorsal surfaces of T2–T5 with sparse, semi-erect, mostly simple, short (0.5 OD) dark brown setae, longest on T5; T6 densely covered (integument not visible) with appressed, very short, light ferruginous setae, with longer (1.5 OD), semi-erect, poorly branched, dark brown setae anterolaterally. Pubescence of S6 as in Figs. 6, 7 . Punctation. Face finely and closely punctate (<PW), punctures larger on clypeus, integument smooth and shiny; vertex with integument imbricate between punctures; gena with shallow, larger punctures than face, integument weakly imbricate. Mesoscutum, mesoscutellum as on vertex, punctures coarser and larger on mesoscutellum, mesepisternum and metepisternum coarsely punctate, punctures larger, closer (<0.5 PW) than mesoscutum; basal area of propodeum strongly imbricate. Terga densely, finely punctate (<PW). Sterna with punctures coarser, larger than on terga.

Male. As in female except for: Body length, 12 mm; forewing length, 7.7 mm. Structure. Head 1.6 times as wide as long; interalveolar distance 1.6 times longer than alveolorbital distance; interocellar distance 2.4 OD; ocelloccipital distance 2.5 OD; gena narrower than width of compound eye in profile; clypeus 2.3 times broader than long, apical margin as in Fig. 22 ; mandible tridentate as in Figs. 12–14 ; scape 2.4 times longer than broad, pedicel slightly wider than long, F1 slightly longer than broad, slightly longer than pedicel, F2 1.6 times longer than F1. Front coxal spine as in Fig. 25 ; fore femur compressed antero-posteriorly, 2.5 times longer than wide, dorsal margin almost straight, ventral margin broadly convex, carinate; fore tibia 0.8 times length of femur, somewhat compressed, about 3 times longer than wide; basitarsi of all legs slender and unmodified; hind tibia 3.2 longer than wide; hind basitarsus about 3.9 times longer than wide, about half tibial length. T6, T7, S5, S6, S8, genitalia as in Figs. 30, 33, 36 , 39, 42, 45, 48 . Pubescence. In general, longer, denser than in female. Face, mesoscutum, terga with yellowish to light ferruginous setae. Sides of scape with dense, long (> diameter of scape), minutely branched setae; upper half of gena with sparse, short (<OD) setae, denser, longer (2–3 OD) on lower gena. Apex of anterior surface of fore coxal spine with patch of dense, short (0.5 OD) ferruginous setae. Punctation. Coarser than in female. S1–S4 with thin, impunctate, translucent, wide (<OD) marginal zones (as in Fig. 28 for M. flavihirsuta ).

Type material. Holotype: MEXICO, Ver a cr u z: 1Ψ, 31 KM SE Xalaja, 7 Nov 1991, 400 m., along hwy, steep hill to fallow field, [R.] Ayala [ UNAM]; Paratypes: 1Ψ, 8 km S Carrizal, 5 Nov 1991, 140 m hot spring resort, along river, R. Ayala [ SEMC]; 1Ψ, idem, T. Griswold [ BBSL]; 1♂, Catemaco, 6 Sep 1974, W. Hanson & G. Bohart [ BBSL]. GUATEMALA, Mixto Viejo: 1♂, 30 Oct 1982, H. Suzuki [ BBSL].

Etymology. The specific name means “long setae”, in reference to the long setae on the apex of the gonoforceps in the male genitalia.

Figures

FIGURES 1 – 24. Mid tarsomeres of females (1, 2); male mid tibial spur (3); female mandible (4, 5); sternum six of female, ventral and lateral views (6, 7); apical margin of clypeus of females (8, 9); apex of sternum six (close-up of selected area in Fig. 7) in lateral view (10, 11); superior, lateral and inferior views of male mandible (12 – 20), detail of lacinia of female and male mouthparts (21), and apical margin of clypeus of males (22 – 24). M. flavihirsuta (28); M. longuisetosa sp. nov. (1, 3, 4, 6 - 8, 12 – 14, 21, 22); M. rossi (9, 11, 15 – 17, 23); M. sabinensis (10, 18 – 20, 24).

FIGURES 25 – 38. Fore coxa (25 – 27), sterna four (28 – 29), and five (30 – 32) of males. Terga six, dorsal and ventral views (33 – 35) and seven, dorsal view (36 – 38) of males. M. flavihirsuta (28); M. longuisetosa sp. nov. (25, 30, 33, 36); M. rossi (26, 29, 31, 34, 37); M. sabinensis (27, 32, 35, 38).

FIGURE 39 – 50. Male genitalia and associated sterna. Sternum six (39 – 41), genitalia, dorsal and ventral (42 – 44), and lateral views (45 – 47), and sternum eight (48 – 50). Megachile longuisetosa (39, 42, 45, 48); M. rossi (40, 43, 46, 49); M. sabinensis (41, 44, 47, 50).