70 



PROCEEDINGS OF THE ACADEMY OF 



[1896. 



When Mr. Baker sent me this species, with the statement that it 

 was found on Solidago, I could hardly believe there had not been 

 some mistake, as it so nearly resembled P. zebrata, which I have 



Fig. 12. Fig. 11. 



found always on Cleome, never on Solidago. Mr. Baker, however, 

 assures me that there has been no mistake ; and on re-examining the 

 series I find that it differs from zebrata, in the males at least, by the 

 average greater reduction of the pale bands of the abdomen, and 

 constantly in the broader supraclypeal mark. We thus appear to 

 have a species in the early stages of difterentiation, perhaps hardly 

 to be regarded as more than a race of zebrata. I have taken the 

 liberty of naming it after Mrs. Baker, who has collected part of the 

 material received from Fort Collins. 



Since the above was written, I have examined the $ genitalia of 

 canina (zebrata) and bakerce, and find apparently good distinctions. 

 See fig. 12. 



Three species found on Solidago in Colorado, one being also found 

 at Santa Fe, N. M. 



25. Perdita affinis Cr., Tr. Am. Ent. Soc, 1878, p. fi'j. c? 5 (Hab., Colorado). 



Five specimens were collected by Ridings ; I have examined one 

 of the types. Mr. Baker sends me two 9 s taken at Fort Collins, 

 Colo., one on Aug. 8th, the other on Aug. 15, 1895. The latter was 

 on Solidago canadensis. 



Cressou's description is not entirely satisfactory. The nervures 

 and stigma (except the hyaline centre) are dark. The clypeus in 

 Mr. Baker's examples has two black bars ; in the type specimen 

 examined these bars are present, though not so much developed. 



The vertex and mesothorax are dark green, granulai', dull. The 

 clypeus is not hairy. The wings are slightly smoky ; the marginal 



