286 



HOUGH. 



[Vol. II. 



C. viridescejis Desv. (1830), syn. violacea Meig. (1838), Fig. 5. 

 — Prostigma usually black or dark brown. Abdomen in about 

 half the specimens dull green, with pollinose coating instead of 

 blue, as in erytJir. Strobl has pointed out that this may be a 



melanochroitic form of ejythi'., but I think that the combination 

 of the color differences with the uniform presence of a 3d post, 

 i.a. proves the specific distinctness ; only one out of several hun- 

 dred specimens examined lacked the 3d post. i.a. Not very 

 common ; occurs especially in early spring and late fall. 



C. coloradcnsis nov. sp., two males and four females (Colorado, 

 C. F. Baker). — Prostigma black or dark brown. Abdomen dull 

 green, with slight pollinose coating. Were it not for the male 

 front being twice as wide, this might well be considered a 

 connecting link between crytJir. and viiidesccns. 



C. latifrons nov. sp. (Fig. 6), eight males and twenty-eight 

 females ; Pullman and Seattle, Wash., C. V. Piper ; Moscow 

 and Craig's Mt., Idaho, J. M. Aldrich ; Santa Barbara, Cal., 

 Dyar ; Mexico, O. W. Barrett. — Seven specimens have a 

 minute 3d post. i.a. bristle. The second large pair of ocellar 

 bristles (almost as large as the regularly situated pair) is about 

 0.05 to 0.1 mm. caudad, and about as much mesad the posterior 

 ocelli. A stout costal spine just basad the end of the auxiliary 

 vein ; sometimes this is so appressed as to be seen with diffi- 

 culty. Abdomen dull bluish green, with some pollinose coating. 



I feel very certain of the following synonymy : aurnlans Desv., 



