276 ENTOMOLOGICAL NEWS. [Oct., '04 



Some Little-known Bees of the Genus Colletes. 



BY T. D. A. COCKERELL. 



The following table and notes are based on specimens in the 

 British Museum, the species of F. Smith being represented by 

 the types, and those of Spinola apparently by cotypes. 



A. Abdomen not at all blue or green. 



Large, Andrena-\\^Q, thorax with conspicuous ochreous or fulvous pu- 

 bescence ; abdomen without conspicuous continuous hair- 

 bands, or with none i ..... i. 



Smaller, of ordinary Co/letes-iorm 3. 



1. Malar space longer than broad; size larger than the others; stigma 



practically obsolete ; . second recurrent nervure with only a 

 gentle single curve (Chile). 



nigriventris Sm. (probably same as nigroventris Spinola). 

 Malar space much broader than long ; stigma distinct 2. 



2. Abdomen distinctly subfasciate ; second recurrent nervure with a 



strong double curve ; second and third submarginal cells about 



equally broad above thoracica Sm. . 



Abdomen not fasciate ; second recurrent nervure with a slight double 

 curve ; second submarginal cell extremely broad, much broader 

 than third intricata Sm. 9 



3. First abdominal segment with strong punctures ; disc of thorax with 



ochraceous or fulvous hair, not at all mixed with black ; abdo- 

 men with broad continuous hair-bands 4. 



First abdominal segment without strong punctures ; disc of thorax 

 with dull white or griseous hair, mixed with black ; abdomen 

 only subfasciate 5. 



4. Larger ; stigma dark brown ; thoracic pubescence short and fulvous. 



perplexa Sm. $ . 

 Smaller ; stigma orange-fulvous ; tarsi light red . mandibularis Sm. <j\ 



5. Abdomen obconical, shining ; stigma ferruginous ; hair of face dull 



white nitida Sm. 9. 



Abdomen broader and duller ; stigma very dark ; hair of face longer 

 and with much black at sides grisea Sm. $. 



B. Abdomen blue or green. 



Dorsum of thorax covered with short, dense, very bright red hair ; abdo- 

 men brilliant dark purple-blue ; malar space fairly large, but 

 broader than long ; stigma distinct but small ; second recur- 

 rent nervure with a strong double curve (Mencloza, Argentine). 



bicolor Sm. 9 . 



Dorsum of thorax without such red hair . i. 



