102 PROCEEDINGS OF THE ACADEMY OF [1896. 



i 



Abdomen rather broad, dark sepia-brown, without light mark- 

 ings, the distal margins of the segments more or less pallid. Ven- 

 ter pale brown. Tip pale testaceous. 



Hab. — Las Cruces, N. M., one on Verhesina encelioides, Sept. 28, 

 1895. 



I had considered the possibility that this might be the $ of as- 

 teris, but it differs too much from it for this to be likely, I think. 



Group of P. alhipennis. 



67. Perdita sparsa Fox, Proc. Cal. Ac. Sci., 1893, p. 16. cf ? (Hab., Margarita 

 and Magdalena Islands, L. Cal.) 



Collected by Mr. Haines in March, being, therefore, distinct from 

 the other members of the group by its vernal appearance. I have 

 examined a 9 from Magdalena I., March, 1889, one of the types. 

 It is very near to albipeiinis, and the difference of punctuation, 

 mentioned by Mr. Fox, is not a very satisfactory character. It is, 

 however, readily distinguished thus : 



P. alhipennis 9 • 



Nervures colorless. 

 Stigma not so margined. 

 Median mark broadening above 

 to a T-shape. 



P. sparsa 9 • 



Nervures dark. 



Stigma margined with brown. 



Size a little smaller. 



Median mark of clypeus broad, 



lance-head-shaped, going to a 



point above. 

 Three yellow bands on abdomen, 



first entire, the other two with 



a linear interruption. 



68. Perdita verbesinae n. sp. 



5 . — Length 7 mm. Head and thorax green, abdomen black, 

 wings milky-hyaline. Head rounded, moderately small, unusually 

 pubescent, especially on occiput and cheeks, the hairs on occiput 

 pale fulvous, those on face and cheeks white. Face and vertex 

 brassy-green, vertex rather strongly rugulose, and sparsely punc- 

 tured. Mandibles rufescent, yellowish at base, simple but strongly 

 elbowed ; clypeus black, punctured, with a longitudinal central yel- 

 low line, not always produced to the margins, and a more or less 

 developed yellow patch on each side at anterior margin. Sides of 

 face below, adjacent to clypeus, with a yellow patch. These face- 

 markings are of essentially the same pattern as those of alhipennis. 



