62 PROCEEDINGS OF THE ACADEMY OF [1896. 



14. Perdita pulchrior n. sp. Fig. 7, (part of wing). 



$ . — Resembles the ^ of pallidior, but rather larger and stoutly 



built, with the cheeks armed below with a pi'ominent spine. Head 



large and subquadrate. Second submarginal not so much narrowed 



above. Legs entirely yellow. Abdomen above shiny 



pale orange-yellow, the first segment mostly black, second 



with a pair of dark spots ; no dark bands. The second 



Fig. 7. segment may have its lateral margins also dark, and the 



third segment may show spots. 



Hab. — Albuquerque, N. M., on Mentzelia 7n(f?a,same time and place 

 as pallidior, two males (Ckll., 4,537, 4,538). On Sept. 12th, I was 

 surprised to take another example, also a male, on Bigelovia wrightii 

 close to the Agricultural College, Las Cruces, N. M. This species- 

 may possibly represent 9. dimorphic $ of pallid lor ; the 9 is either 

 unknown, or not to be separated from those presumably referable ta 

 pallid ior. 



Four species found on Larrea in Neiv Mexico. 



15. Perdita larreae n. s}). Fig. 8. (stigma etc). 



$ . — Hardly 4 mm. long, bright orange-yellow, smooth and shiny • 



pubescence consisting of sparse white hairs on vertex, cheeks beneath^ 



mesothorax, pleura, tibise, tarsi, apex and venter of 



abdomen. Head very large, considerably larger than 



the small thorax, subquadrate ; clypeus joroduced into 



Fig. 8. ^ spine at each lower corner, cheeks with a stout spine 



beneath, eyes rather small and narrow. 



Wings small, hyaline, nervures white, stigma hyaline in middle. 

 Marginal cell narrow but hardly produced beyond stigma, not 

 quite as long as first submarginal, appendiculate. Second submar- 

 ginal very small, triangular, coming to a point at its junction with 

 marginal. First recurrent joining, first transverse cubital. Third 

 discoidal cell wanting. 



The mandibles are elongate, simple, dark at tips. The ocelli are 

 more or less dark, with some dark marbling about them. Tongue 

 about as long as head. 



Hab. — San Marcial, N. M., close to Mr. Shope's house, at flowers 

 of Larrea divaricata var, tridentata, June 28, 1895. Five specimens. 



16. Perdita marcialis n. sp. 



$ . — Size and form of P. larrece. Anterior margin of clypeus not 

 so broad, with the spines longer and parallel ; whereas in larrece 



