96 OHIO BIOLOGICAL vSURVEY 



94 B. frontosus Loew. One male, I^ondon, April 19. 



95 B. rileyi Williston. Two males, one female, Columbus, Cincin- 

 nati; April 21 to May 6. 



Merapioidus Bigot 



96 M.villosus Bigot. One female, Hinckley, two females, Lakeville, 

 April I (on Sa/ix). (Figs. 225, 226.) 



Crioprora Osten Sacken 

 *C cya?iogaster hoQw (Pa., Col., Montreal.) 



Criorhina Meigen 



Face produced downwards and forwards; males dichoptic; ground 

 color black, thickly pilose Sub-genus Criorhina 



Face produced downwards, convex below; males holoptic, ground 



color with ^xllow markings, moderateh' pilose ... 



vSub-genus Cyiiorhina Williston 



Face produced downwards, convex below; eyes dichoptic, moder- 

 ately pilose, in large part yellow Sub-genus Souuila Macquart 



Criorhina 



97 C. verbosa Walker. 12 specimens, Lakeville, March 31, April 

 i; one, Ira, March 29. 



( Cynorhina ) 



1 Face without yellow produced somewhat forwards below; second segment of 



abdomen broadly and third and fourth narrowly on the sides, 5'ellow 



umbratilis 



Face in large part yellow 2 



2 Face with a median shining black stripe; second segment of the abdomen on 



the sides, continued more narrowly on the third, yellow intersistens 



Face yellow. Without a median black stripe 3 



3 Front of female wholly yellow; abdomen black except a large part of fourth 

 and the whole of the fifth segments, which are bright orange yellow 



*aiialis Macq. ( N. J. Can. L I. ) 



Front of female black on upper jiart 4 



4 Abdomen with two to four pairs of yellow side-spots touching the lateral mar- 

 gins *nota(a Wied (Ga., Car. ) 



Abdomen with yellow markings as follows: sides of first segment, an inter- 

 rupted or sub-interrupted anterior fascia on second segment expanded in 

 the middle, and the remainder of the segments especially the fourth with 

 a narrow posterior margin; elsewhere black shining pictipes? 



