174 PSYCHE [(3ct.-Dec. 



long conical flattened, antennae inserted midway between the eyes and the 



tip of the rostellum ; proboscis geniculate at the middle trinotatns, sp. n. 



Markings of abdomen arranged in a double series ; head in profile more or 



less hollowed out at the antennae; proboscis geniculate before the middle 



19. 



19. Abdomen with whitish markings beneath, at least in the middle: face very 



long and sharp, frequently paler above; thorax shining; 3 mm. 



acutirostris Loew 

 Abdomen black beneath ; if the face is long the thorax is not shining 20. 



20. Thorax granular, subshining, sparsely pubescent ; facial projection long, acute ; 



humeral mark small, frontal spots punctiform . . luheeleri, sp. n. 



Thorax polished, nearly bare; face short, black; humeral mark large; frontal 



spots transverse ........ heUuhis, sp. n. 



21. With a whitish spot on each side of the front above the antennae . 22. 

 With no whitish spot on the front ...... .25. 



22. Facial projection shorter than width of eye; antennae inserted near its tip; 



lateral line of thorax obsolete ...... bntesiiy sp. n. 



Facial projection equal to width of eye, antennae inserted near its base 23. 



23. Lateral line of thorax well defined ....... 24. 



Lateral line of thorax obsolete ....... tristis l^igot 



24. Head and thorax nearly bare, subaenescent canadensis Loew 

 Head and thorax moderately pilose, with a greenish tinge . arator, sp. n. 



25. Sides of thorax with a yellowish line . . . . . . 27. 



Sides of thorax not marked ; hhick shining species .... 26. 



26. Anterior tibiae subfuscous, hind ones black except extreme tip and base 



carbonarius Loew 

 All the tibiae vittate with black ..... carncus Walker 



27. All the femora and tibiae black ; thorax with a greenish tinge glaber Loew 

 Front and middle tibiae rather yellowish ...... 28- 



28. Blue-green species . . . . . . . . . . 39. 



Black, shining species ....... nigrinus Fallen 



unicolor Loew 



29. Facial projection longer than width of eye . . crassus Loew 

 Facial projection shorter than diameter of eye . . . unicolor, var. 



