112 Journal New York Entomological Society. [Voi. v. 
Ceratina dupla Say. 
Larva. —The following description was drawn up from living speci¬ 
mens. 
Head rather long and narrow, as in Megachile ; full and convex; 
the vertex elevated convex, with fine hairs; front scarcely so broad as 
in Megachile. Clypeus full, convex. Labrum exserted, square, thick 
and very prominent; end much thickened, excavated beneath. Man¬ 
dibles as in Megaehile, long and thick, suddenly bent in under the 
labrum, so that the tips are not visible. Antennae rather thick, bent at 
a considerable angle on the side of the clypeus; the scape longer and 
slenderer than in Megachile , the flagellum a little clavate, the tips 
reaching to the end of the maxillary palpi, or near the tips of the 
first tarsal joint when the leg is normally folded. Ocelli similar to 
those of Megachile , forming raised, acute papillae; the maxillae are 
nearly twice as long as in Megachile , reaching to the middle of the 
body and to the second pair of trochanters. The palpi three-jointed, 
rapidly tapering toward the tip; the basal joint much the largest. 
Labial palpi two-jointed, reaching to the tip of the second pair of legs; 
lingua long and slender, like that of Bombas in length, reaching to the 
Fig. io. Ceratina dupla. Larva; a, head enlarged. (Trouvelot, del.) 
tip of the second abdominal segment. The legs much slenderer than 
in Megachile , the tarsal joints especially slenderer and longer than in 
Megachile , and reaching the same relative distances toward the tip of 
the body. In the median line of each of the second to the fifth ab¬ 
dominal segments is an acute spine, the hind tarsal joints lying on each 
side of and parallel with them; these spines I have not before noticed. 
The last sternite is full and large, rounded triangular. The ovipositor 
