84 PROCEEDINGS OF THE ACADEMY OF [1896. 



dots, wings clear, abdominal markings inclined to be smaller, or 

 wanting on 4th segment. 



43. Perdita biparticeps n. sp. 



S . — Length SJ mm. Head and thorax very dark blue; thorax 

 practically black, except the metathorax. Head large in compari- 

 son with the small thorax, rounded, somewhat broader than long, 

 cheeks unarmed. Face below antennae, labrum and mandibles ex- 

 cept their slightly rufescent tips, lemon-yellow. The yellow extends 

 above the antennae a short distance (and equally) in the median line 

 and at the sides, almost exactly as in the $ of affinu, the limit of the 

 lateral extension marked by a small pit close to the ocular margin, 

 where the yellow forms an angle of about 55°. Cheeks yellow below, 

 the yellow extending furthest upward along the orbital margin. 

 Antennae sepia above, yellow below, the scape all yellow except end 

 above. Vertex granular. Mandibles simjDle. Mesothorax shining 

 but noticeably sculptured, the surface liueolate rather than granu- 

 lar. The mesothorax, as also the face, is very free from hairs ; and 

 even on the pleura and sides of metathorax there are comparatively 

 few. The upper part of the cheeks, however, exhibits conspicuous 

 white hairs. 



Tegulae hyaline ; wings slightly smoky, nervures and stigma sepia- 

 brown, the latter pallid in middle. Marginal cell rather large, 

 appendiculate, substigmatal portion about as long as poststigmatal ; 

 2d submarginal rather large, narrowed one-half to marginal; 3d 

 discoidal distinct. 



Legs yellow, anterior and middle femora and tibiae with a dark 

 brown patch behind ; posterior femora brown with yellow ends and 

 an obscure yellow stripe in front, posterior tibiae brown with the 

 proximal fourth pallid, tarsi whitish. 



Abdomen above pale sepia-brown, shining, with rather obscure 

 and suffused yellow markings, namely a patch on disc of 1st segment, 

 and bands at bases of segments 2-4, the last two of these shorter and 

 emarginate posteriorly. Venter dull yellow, brownish toward tip. 



Hub. — Las Cruces, N. M., on Pedis paj^posa, Sept. 17, 1895, one 

 example. 



Differs from rectangulata by its small size and shiny mesothorax, 

 as well as the markings of the abdomen. The pleura has not the 

 yellow patch seen in maculipes. 



