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Megachile alucaba (Snelling, 1990)
Chalicodoma (Chelostomoides) alucaba Snelling, 1990

Life   Insecta   Hymenoptera   Apoidea   Megachilidae   Megachile
Subgenus: Chelostomoides


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Identification
Extracted from: Snelling R.R., (1990). A Review of the Native North American Bees of the Genus Chalicodoma (Hymenoptera: Megachilidae). Contributions in Science, Number 421, pp. 1-39.

Male with unmodified protarsus and without ven-tral mandibular process; carina of tergum 6 low and inconspicuous, weakly bilobate; clypeus with prominent median process, but lateral processes weak; third mandibular tooth with a small, conical tubercle on inner surface. Female with short, broad mandible and tergum 6 without preapical groove; apical margin of clypeus produced and with small median process and some erect fuscous to blackish hairs on disc; tergum 5 without traces of marginal hair band.

FEMALE. Measurements (mm): HW 2.71-2.95; HL 2.24-2.43; WL 5.3-5.6; TL 9.4-10.5.

Head about 1.2 times as broad as long; inner eye margins very weakly convergent below, upper in-terorbital distance less than 1.1 times lower inter-orbital distance; in frontal view, vertex-preocciput elevated above ocelli by considerably less than transverse diameter of anterior ocellus. Mandible robust, apical margin with four well-defined teeth and with a weak tooth between third and fourth (inner) teeth. Sides of labrum mostly subparallel, narrowed preapically, without median, preapical seta-pit. Apical margin of clypeus slightly produced and with low median denticle, margin on either side irregular but without definite denticles; disc with very narrow median impunctate line, broadest basad, otherwise contiguously, moderately punctate, median line and interspaces smooth and shiny. Supraclypeal area shiny between contiguous, moderate punctures, but interspaces progressively less shiny above, merging to slightly shiny interspaces between contiguous, moderate punctures of frons; vertex and preocciput similar to frons, but with some irregular interspaces up to one-half puncture diameter. Gena, at widest, about one-half as wide as eye, shiny between contiguous, fine to moderate punctures. Pedicel about twice longer than first fla-gellar segment and less than twice longer than sec-ond; first flagellar segment broader than long; me-dian flagellar segments slightly longer than broad. Interocellar distance greater than ocellocular dis-tance, each distinctly greater than ocelloccipital distance.

Mesoscutum and scutellum moderately shiny between mostly contiguous, moderate punctures, scutellum with a few coarse punctures; mesepisternum, metepisternum, and side of propodeum similar, with punctation on anterior portion of mesepisternum tending toward rugosopunctate.

Discs of terga 1-5 moderately shiny, that of first tergum with subcontiguous, fine to moderate punc-tures, those of terga 2-5 similar, but punctures a little more separated and with fewer fine punctures; depressed apical margins with contiguous, fine punctures at base, but with narrow, impunctate rims; tergum 6 slightly shiny between contiguous, fine punctures; preapical groove absent.

Integument generally blackish, flagellum and legs dark reddish brown. Tegula medium brown, becoming transparent yellowish brown toward margins. Wings transparent light brown; veins and stigma dark to medium brown.

Pilosity about as in other Chelostomoides, but clypeal disc with a few light brownish hairs, frons and vertex with numerous dark brown to blackish hairs; humeral angle of pronotum with flocculent hair patch; terga 2-5 with basal fasciae of appressed, plumose, white hairs and terga 2-4 with narrow apical fasciae of similar hairs, tergum 5 without apical band; terga 2-5 with sparse, very short, simple, yellowish to brownish hairs across discs and a few long, simple, whitish hairs at sides; tergum 6 with short, subappressed, short-plumose, pale hairs; scopa whitish on sterna 2-5, dark brown on 6.

MALE. Measurements (mm): Holotype HW 2.71; HL 2.24; WL 5.2; TL 8.3. Paratypes: HW 2.62-2.90; HL 2.14-2.52; WL 5.1-5.8; TL 7.5-8.7.

Head about 1.2 times as broad as long; eyes weakly convergent below, upper interorbital dis-tance about 1.2 times lower interorbital distance; preoccipital margin arcuately produced above ocelli by about diameter of anterior ocellus. Mandible (Fig. 20) weakly quadridentate, second (subapical) tooth very low and blunt, interspace between third and fourth teeth broad and deep; a low, conical tubercle present on inner side of fourth tooth. Labium as in female. Apical margin of clypeus nearly straight between weak lateral tubercles and with large median tooth (Fig. 1); disc dull, finely to moderately rugosopunctate. Frons slightly shiny, finely rugosopunctate, grading to contiguously to sub-contiguously, moderately punctate on vertex-preocciput. Gena, in profile, nearly as wide as eye, with moderate punctures. Pedicel about twice longer than first flagellar segment, and about as long as second; middle flagellar segments about 1.5 times longer than wide. Interocellar distance less than ocellocular distance, latter about equal to ocelloc-cipital distance.

Mesosoma about as described for female.

Metasomal terga 1-5 about as in female, but apical margins transparent yellowish and not vertically depressed from discs; carina of tergum 6 low and obscure, with very weak median emargination, apical margin without traces of lateral or submedian teeth.

Hidden sterna and genitalia (Figs. 30, 36-38).

Color as described for female.

Pilosity about as in female, except metasomal terga 1-3 with apical hair bands incomplete and present as lateral patches only, terga 4-5 entirely devoid of apical hair bands; tergum 6 without basal hair band, disc with short, sparse, simple hairs only.


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Updated: 2019-10-15 17:13:37 gmt
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