no 



Journal New York Entomological Society. [Voi. v. 



larva oi Andrena in its head being a little larger, the antennal tubercles 

 being flatter and much less prominent; the eye-pieces less globose and 

 spreading less laterally. The clypeus is longer and larger, and the 

 front edge deeply excavated, where in Atidrena it is square and entire. 

 The labrum is narrower, the front edge more excavated, being hardly 

 at all so m Andrena. The mandibles are stouter; the maxilla large 

 and slender, as is the labrum, which has a broad, thickened, square 

 chitinous tip, not present in Andrena, the end of which in Andrena is 

 fleshy. 



h Oj G 



Fig. 9. MegachiU centiincularis. <?, larva; /', c, pupa. (Emeiton, </£•/. ) 



Pupa. — Head broad and flat, subtriangular, the front flattened ; 

 the supraantennal area broad and flat ; seen laterally the head is much 

 more vertical than in Bombi/s, and is more like Apis ; seen from above 

 the head is much broader, supraclypeal piece transversely oblong-trian- 

 gular, thus setting the antenn?e far apart. Clypeus transverse, broader 

 than long, with two curvilinear lateral lobes which are much longer 

 and more curved than in Bombus. Labrum square, longer than broad, 

 the edges square, the sides contracting slightly towards the anterior 

 edge, which is square, not rounded or excavated. Mandibles long, 

 stout, thick, not incurved, but rather bent inwards so as to meet just 

 in front of the labrum. The eyes are more prominent and farther apart 

 than in Bombus. Antennae more rectangularly bent than in Bombus 

 owing to the greater width of the head ; the joints are shorter, much 

 more convex ; only reaching to just beyond the middle of the anterior 

 tarsi, whereas in Bombus they reach to the second joint of the posterior 

 tarsi. The maxillas reach just beyond the anterior tarsi ; neither pair 

 of palpi are visible. Paraglossse extending to half-way between tips of 

 lingua and the maxillae. The mouth parts are less loosely arranged on 

 the breast than in Rhopalitm, Pelopceus and the other fossorial forms. 



