t. d. a. cockerell. 65 



Group B. 



Black species ; thorax above covered with black or brown-black hair. 

 Larfte robust species, over 15 mm. long ; hair of legs black, but shining white on 

 outer side of bind tibia and basal half of first joint of hind tarsus. 



farbonaria Cress.=infernalis D. T. 



Much smaller, less than 13 mm. long. 1. 



1. Femora dark chestnut (Cuba) atrata Cress. % . 



Femora dark chestnut, but anterior ones almost black ; fifth abdominal seg- 

 ment covered with bright orange-fulvous hair (Nevada). 



periiigra Cress. 9- 



Notes. — Tlie ua,mecarbonaria is a honionyni, so Dalla Torre pro- 

 posed infer )ialk. I had been erroneously informed that infernalis 

 was an Einphoropsis, and so was led to redescribe it as A. corvicolor. 

 A comparison of descriptions indicates that corvicolor may possibly 

 rank as a variety, but it certainly is not a distinct species. A. at- 

 rata and pernigra are so much alike, that were it not for the totally 

 different localities, one might imagine them to be sexes of one 

 species. 



Group C. 



Medium sizedor large species; abdomen with iegumentary white or creamy bands 



I have given a table of this group in Bull. So. Cal. Ac. Sci., 

 190-t, and other remarks in Canad. Entom., 1905, p. 335. I offer 

 now my notes from the Cresson collection. 



Larger; hair of thorax above fulvous, not mixed with black.. 1. 



Bather smaller; hair of thorax above with much black intermixed. 2. 



1. Clypeus of % with a large quadrangular black patch on each side above (Il- 



linois) walNhii Cress. 



Clypeus of % with very small marks above (Colorado) siniiliii Cress. 



2. Hair of thorax above except the black, mouse-grey. 



marginata Smith, and cleomiiii Ckll. 

 Hair of thorax above, except the black, ochracous or fulvous 3. 



3. Tegulse of both sexes black californiCH Cress. 



Tegulae ( 9 ) bright shining copper red, semi-translucent..- • • -lexana Cress. 



NOTES. 



(^1.) A. marginata and cleomis are not separable in the 9. 

 The Cresson collection contains three % marginata, from Mex- 

 ico. The British Museum has males regarded as marginata, but 

 they are of two species. The S marginata described by Dours is 

 different from cleomis. My impression is, that Dours' S was not 

 the true insect, and that marginata and cleomis are really one 

 species. 



TEANS. AM. ENT. SOC. XXXII. (9) JANUARY, 1906. 



