78 PROCEEDINGS OF THE ACADEMY OF [1896, 



abdomeu being fuscous, and in the posterior tibise being clothed with 

 a ' a thin scopa ' of pale yellow pubescence, as Smith described, 

 which has now faded to a dirty white." 



While I am not yet certain, I am decidedly inclined to suppose 

 that we may after all recognize Macrotera as a valid genus, with 

 these species, M. bicolor Sm., 31. texana Cr., and 3/. latior (Ckll.). 



A species from Nevada, yellow loith black markings, habits unknown^ 

 9 unknown. 



34. Perdita cephalotes (Cr.) Cr., Cat. Hym., 1887, p. 296. 



Macrotera cephalotes Cr., Tr. Am. Ent. Soc, 1878, p. 71. cT (Hab. Nevada). 



Described from a single specimen, collected by Mr. Hy. Edwards, 

 It has a very large head, after the manner of grandiceps and crassi- 

 ceps, but the markings are very like those of punctosignata. 



Two specimens were obtained by the Death Valley Expedition in 

 the Panamint Mountains. (N. Amer. Fauna, No. 7, 1893, p. 246). 



Tivo species found on mesquite in New Mexico. 



35. Perdita punctosignata Ckll., Suppt. to Psyche, Sept., 1895, p. 6. cf . (Hab. Las 

 Cruces, N. M.). 



Two specimens are known, both from mesquite; one taken by 

 Miss J. Casad, the other by Mr. Alfred M. Holt. The latter speci- 

 men has a large yellow patch on dorsum of metathorax, instead of 

 two spots. The eyes are pale coffee-color Avith a purplish tint. 



36. Perdita exclamans (Ckll.). 



Perdita 7iitidella var. exclamans Ckll., Suppl. to Psyche, Sept., 1895, p. 5. ^. (Hab. 

 Las Cruces, N. M.). 



This and the last are spring species, found in May. P. nitidella^ 

 which frequents Bigelovia in the late summer and early autumn, is 

 unquestionably distinct from exelamans. 'Of the latter we know 

 four specimens, 3^,1?. Prof. Townsend took a $ some years 

 ago ; this is the specimen formerly reported in error as nitklella. 

 Miss Casad found the type specimen, and the other two were ob- 

 tained at the same locality by Mr. A. M. Holt in 1895, a <? on a 

 young Cottonwood tree, not in flower, and near some mesquite 

 bushes, May 9th, and a 9 on mesquite. May 13th. 



The 9 may be described as follows : 



9 . — Larger, about 6 mm. long, Antennre dark brown above^ 

 yellow beneath. Clypeus cocked-hat shape, flattened above, very 

 pale yellowish with the usual two dark dots. Supraclypeal yellow 

 mark well-developed, produced above into a narrow stripe widening 



