282 ENTOMOLOGICAL NEWS. [July, '07 



28. Process of labrum rounded ; abdomen with its tegument partly red 



dish, the first dorsal segment being black at base and apex. 



erythrogaster rhodnra. 



29. Ten mm. in length ; clypeus uniformly dullish, sparsely puuctured, 



but impunctate along the middle ; process of labrum nearly 

 four times as wide as long ; thorax and abdomen throughout 

 more or less dullish, like the head, with the exception of the 

 scutellum which is rather shining ; pubescence pale, ochreous; 

 scopa of posterior tibiae composed of simple hairs that one 

 might say look very like hair "standing on end ;" abdomen 

 subfasciate ; color of the anal fimbria sort of a golden brown ; 

 wings brownish, with sort of a yellowish tinge .... cornelli. 



30. Abdomen black 31. 



31. Process of the labrum truncate, or semicircular, or when seen from 



below, subemarginate 32. 



Process of the labrum otherwise 43. 



32. Enclosure of the metanotum granular 33. 



Enclosure smooth 38. 



33. The greater portion of the longitudinal middle third of the clypeus 



impunctate 34. 



The clypeus not so 35. 



34. The clypeus with a rather circular impunctate area, which is usually 



highly polished and conspicuous ; abdomen subfasciate. 



flavoclypeata. 



35. The clypeus with a narrow but distinct median impunctate space . 36. 



36. The clypeus very sparsely punctured robertsoni. 



The clypeus closely punctured 37. 



37. Pubescence ochreous to brownish-ochreous ; abdomen dull ; clypeus 



somewhat flattened arabis. 



38. The tips of the wings distinctly clouded 39. 



The tips of the wings not so 40. 



39. Clypeus abundantly and distinctly punctured . nubecula. 



40. Dorsulum dull 41. 



Dorsulum shining . 42. 



41. Clypeus dull and smooth distans. 



42. The abdomen dull canadensis. 



43. Process of the labrum finger-shaped ; the anal fimbria from pale 



brown to blackish in color, usually the latter placida. 



44. Abdomen black ; scopa of posterior tibiae loose, i. e. with its hairs 



sparse gerani-maculati. 



45. Process of the labrum quadrate or nearly so, and margined. . fragilis. 

 Process of the labrum rounded, not margined Integra. 



46. Face immaculate 47. 



Face maculated , 48. 



47. Process of the labrum emarginate ; clypeus roughened and indistinctly 



punctured ; the dorsulum and scutellum shining. . . solidaginis- 



