1896.] NATURAL SCIENCES OF PHILADELPHIA. 87 



densely white-hairy. Prothorax with less pale marking, the tuber- 

 cles not connected with yellow of margin of prothorax. Nervures 

 dark brown ; 3d discoidal distinct. Legs about as in austini, but 

 anterior femora partly black in front, and middle femora with less 

 black. Abdomen banded as in ^ , but the banding yellowish-white. 



48. Perdita bigeloviae n. ?p. 



$. — About 5 mm. long. Resembles nitldella $, but larger; 

 face-markings as in gutierrezice $ , but the black spots close to eyes 

 above are not enclosed, but only produce a notch in the yellow ; and 

 the yellow is in the middle-line rather more produced upward, not 

 reaching the ocelkis, but terminating some distance before it in an 

 emarginate truncation. Venation as in nitidella, with 3d discoidal 

 cell very indistinct. Pleura largely yellow, the amount of yellow 

 on it variable. Legs and abdomen as in nitidella. Cheeks unarmed. 

 (1 S% examined.) 



9 . — Length 6mm. Similar to nitidella 9 , the pale marks of 

 fiice rather inclining to pinkish-brown ; and the marks of sides of 

 face distinctly notched on inner side, and sometimes also at end. 

 Sometimes there are two pale spots above the clypeus ; 3d discoidal 

 cell distinct. Abdomen brown-black, with creamy-white bands on 

 segments 1-4, that on 1 interrupted ; 5 with a rudimentary linear 

 broken band, or frequently with a distinct broad band. 



Hah. — Albuquerque, N. M., several of both sexes between the 

 old and new towns, on Bigelovia ivrightii, Aug. 16, 1895. The males 

 of this lot were unfortunately reddened by the cyanide ; but the 

 females, collected in the same bottle at the same time, were not so 

 affected. On September 11th, a specimen of each sex was taken on 

 Bigelovia ivrightii close to the Agricultural College at Las Cruces. 

 The 9 is very similar to that of P. mmierata. 



49. Perdita maculipes n. sp., or variety. 



S • — A small form, 4 mm. long, similar to nitidella, anterior and 

 middle femora all yellow, anterior and middle tibise each with a black 

 patch. 



From nitidella it is readily separated, thus : 

 (1). Median and lateral upward extensions of yellow on face ir- 

 regularly truncate ; anterior and middle tibiie with a black 

 patch ; pleura with a large yellow patch ; bands of abdo- 

 men united at sides ; lower part of cheeks broadly yellow, 



^^ maculipes S . 



