112 Journal New York Entomological Society. [voi. \\ 



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 Megachile, long and thick, suddenly bent in under the 

 labrum, so that the tips are not visible. " Antennre 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 papillre ; 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 Boinlnis in length, reaching to the 



Fig. lo. Ceratina dupla. Larva; <z, head enlarged. (Trouvelot, r/t'/. ) 



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 sternile is full and large, rounded triangular. The ovipositor 



