68 PROCEEDINGS OF THE ACADEMY OF [1896. 



P. sphaeralceae, race alticola. 



9 . — Nervures dark brown. A light spot on each side of 5th 

 abdominal segment. (Ckll., 3,850). The spots on 5th segment may 

 be absent as in the type. 



$ . — Nervures dark, as in the 9 • The dog-ear marks have more 

 or less of a dark border below. 



Mut. SUFFUSA. $ . — Abdomen above suffused with brown, only 

 the yellow bands on segments 2 and 3 remaining. Dog-ear marks 

 reduced, their lower half often wanting. 



Mut. 9 • — Only 6 mm. long. Abdominal bands narrow^ that on 

 segment 5th present though interrupted in the middle, (Ckll., 3,849). 

 This may be the proper 9 of mut. suffusa. 



Hah. — Santa Fe, N. M., common at flowers of Sphceralcea angus- 

 tifolia; the males much more frequent than the females. The 

 species was first taken in Mr. Boyle's garden on July 25, 1895; 2 

 normal S alticola, 2 <^ sxiffnsa. On July 27th were taken several 

 males, about equally divided between alticola proper and suffusa, 

 and also two females. The latest date I have is Aug. 8th, a 9 taken 

 by Miss Myrtle Boyle. The S differs from zehrata $ by its very 

 dark (not bluish) thorax, much yellower light markings, darker 

 stigma, and rather differently shaped face-markings. 



A species found on Cleome serrulata (C. integrifolia). 



23. Perdita zebrata Cr., Tr. Am. Ent. Soc, 1878, p. 69. $ (Hab., Colorado). 



S Perdita canina Ckll., Proc. Phila. Acad., 1895, p. 17. (Hab., Santa F6, N. M.). 

 Figs. 9, 10, (face-marks and <} genitalia). 



Originally described from seven specimens taken by Ridings and 

 Morrison. The $ was not known until described by me as canina. 

 My No. 1,270 (1. c, p. 18) proves to have been the true 9 , and is 



identical with at least some of Cresson's types 

 of zebrata, though it is possible that under 

 this name more than one species was in- 

 cluded. The matter is complicated from the 

 variability of 9 zebrata on the one hand, 

 and the discovery of I', bakeroi on the other, 

 the latter species being easily distinguished 

 in the $ , but only with ex- -.^ 

 treme difficulty in the 9 • 

 Mr. Fox has sent me a 9 

 Fig. 10. Qf zebrata from the Magdalena ^'^- ^• 



Mts., N. M., Aug., 1894, collected by Snow. Mr. C. F. Baker sends 



