188 Journal New York Entomological Society. [VoI. xv 



23. Antenna; reddish beneath, mesothorax dull, the punctures minute; about 6y^ 



mm. long cordleyi Crawford. 



Antenn?edark beneath, mesothorax shiny, punctures larger, about 8 mm. long. ..24 



24. Rug.ie of metathorax very coarse truncatus Robertson. 



Rugce of metathorax fine 25 



25. Punctures of mesothorax close, of first abdominal segment distinct. 



cooleyi Crawford. 

 Punctures of mesotliorax sparse, of abdomen minute aberrans Crawford. 



The following, described from the males only, have not been 

 placed : disti>ictus Provancher, cinctipes Provancher. 

 Halictus bardus Cresson. 



I have not seen authentic material of this species and the identifi- 

 cation may be wrong. 

 Halictus trizonatus Cresson. 



Either this is a very variable species or there are several closely 

 allied species in the western United States, but it will take a large 

 series of specimens to decide this point. H. egregius Vachal seems to 

 belong here and also the male described by him as colatus. 

 Halictus similis Smith. 



The species which I have always called by this name, is called 

 discus by Professor Cockerell, according to notes sent me by Mr. J. 

 H. Lovell. The two species would run out at the same point in the 

 table. Comparison with the types is needed to determine which 

 species is found in the New England states. 

 Halictus subobscurus Cockerell. 



Comparison of the types shows the species described by me as 

 cockerelli to be a synonym of this species. 

 Halictus divergens Lovell. 



This is very closely allied to quadritnaculatus and may be only a 

 variety. 

 Halictus diatretus Vachal and Halictus synthyridis Cockerell. 



These seem to be very close to each other and to foxii but both 

 differ from that species in the males having the legs entirely dark. 

 Halictus truncatus Robertson. 



H. fulgidits Crawford will have to go as a synonym of this species. 

 Halictus galpinsiae Cockerell. 



In the females this species and H. aberrans Crawford are very 

 closely related as shown by the table but in the males they are easily 

 separated, the male of gaipinsice having appressed pubescence. This 

 seems without any doubt to be the form described by Vachal as 

 gelidus 



