186 Journal New York Entomological Society. [Voi. xv. 



39. Abdomen bare, no hair patches or appressed pubescence on segments ; facial 



quadrangle slightly longer than broad foxii Robertson. 



Abdomen with hair patches of appressed pubescence on bases of segments ; facial 

 quadrangle as broad, or broader than long 40 



40. Abdomen brown, rather dull, patches large, covering fourth segment entirely. 



cordleyi Crawford. 

 Abdomen darker, shiny, patches of hair smaller, not covering fourth segment.. ..41 



41. Smaller, less than 6 mm. ; wrinkles of metathorax few, failing apically, wings 



hyaline nigrescens Crawford. 



Larger, 7 mm. ; wrinkles of metathorax more numerous, reaching to apex, wings 

 yellowish niger Viereck . 



42. Wings clear, hyaline, veiy ample; wrinkles of metathorax not reaching to 



apex 43 



Wings yellowish or dusky, wrinkles or rugae reaching to apex 44 



43. First abdominal segment very delicately but distinctly punctured; punctures of 



mesothorax sparser aherra^is Crawford. 



First segment almost entirely impunctate ; punctures of mesothorax closer. 



galpinsict Cockerell. 



44. Mesothorax dull from strong lineolation 45 



Mesothorax shiny, lineolation obscure 46 



45. Smaller, hardly 7.5 mm. ; abdomen shiny, basal hair patches distinct. 



niger Viereck. 

 Larger, over 8 mm. ; abdomen dull, hair patches not 2i^^?iX^\-\\...qHebecensis n. sp. 



46. RugK of metathorax very coarse, punctures of mesothorax sparser. 



trtincalus Robertson. 

 Rugae of metathorax fine, punctures of mesothorax close cooleyi Crawford. 



The following species are not included in the above table : fartus 

 Vachal ; lusorius Cresson ; cfassicornis Kirby ; discus Smith which 

 would run to similis in the table ; egregius Vachal which is, I think, 

 trizonatus or a closely allied form ; diatretus Vachal and synihyridis 

 Cockerell which would both run close to foxii in the table and which 

 are closely related to each other, especially in the males. 



The following table will serve to separate all the species known to 

 me in the male sex and the notes to indicate where some of the others 

 will run. 



Table fop the Males. 



1. Apical margins of abdominal segments with strong hair bands 2 



No hair bands on apical margins of segments 5 



2. Wings deep yellowish ; legs yellow and red .parallelus Say. 



Wings not deep yellow ; legs yellow and black 3 



3. Antennae fulvous beneath ligatus Say. 



Antennre only obscurely reddish beneath 4 



4. Tegulse coarsely punctured all over /6'ro«jr?V Lepeletier. 



Tegulffi not punctured all over .farinosits Smith. 



