b. _Cruriferæ_ (collectors on the shanks and tarsi). † _With two submarginal cells to the wings._ Genus 10. EUCERA, _Scopoli_. (Plate VI. fig. 2 ♂ ♀.) APIS ** _d_ 1, Kirby.
_Gen. Char._: HEAD transverse; _vertex_ concave; _ocelli_ in a curve, and very high up; _face_ flattish; _clypeus_ very convex, hirsute, and fimbriated; _labrum_ transverse-ovate, and emarginate in front; _mandibles_ very obtusely and inconspicuously bidentate; _tongue_ very long and slender, and gradually acuminating, transversely striated; _paraglossæ_ slender, membranous, very acute, and about two-thirds the length of the tongue; _labial palpi_ membranous, and about the length of the paraglossæ, the basal joint linear, broad, longer than the rest united, the second about half its length and acuminate, the two terminal ones are very short and equal, and articulate within the apex of the second joint; _labium_ less than half the length of the tongue, its inosculation concave; _maxillæ_ two-thirds the length of the tongue, subhastate; _maxillary palpi_ six-jointed, short, less than one-third the length of the maxillæ, the basal joint robust, the rest filiform, and gradually decreasing in length and substance. THORAX very pubescent, which conceals its divisions; _metathorax_ truncated; _wings_ with two submarginal cells, the second receiving both the recurrent nervures, one near each of its extremities; _legs_ setose, especially the tibiæ and plantæ, which, in the posterior pair is very dense on the exterior of the tibiæ, and both externally and internally upon the plantæ, the following joints of the posterior tarsi inserted beneath, and within the extremity of their plantæ; the claw-joint being longer than the two preceding, and the _claws_ acutely bifid. ABDOMEN oval, convex above, subtruncate at the base, where it is thickly pubescent, the other segments glabrous on the disk; the fifth segment fimbriated with decumbent short hair, and the terminal segment having a central triangular plate at the sides of which it is rigidly setose.
The MALE differs in having the _antennæ_ longer than the thorax, filiform, but with their several joints curved, the curvature increasing towards the terminal joints, the integument of the whole of the flagellum consisting of a congeries of minute hexagons, the edges of which are all raised, and the whole resembling shagreen; the legs have the usual sexual slighter and extended development, and are necessarily less setose; it is also deficient in the transverse whitish bands of decumbent hair upon the abdomen, which is more densely pubescent on the first and second segments; and the four terminal joints of the posterior tarsi are conterminous with their plantæ.