82 OHIO BIOLOGICAL SURVEY 



12 Pipiza radicum. Walsh and Riley. One female. Columbus, 

 September 15. 



Paragus Latreille 



1 Sciitellum with a yellow border, at least in the female; face of male without 



a black median stripe; front of female narrow above bicolor 



Scutellum without a yellow border; face in both sexes with a black median 

 stripe; front in female of nearly equal width 2 



2 Abdomen with more or less red on the dorsum; vertical triangle in the male 



large tibialis 



Abdomen wholly greenish-black angustifrons 



13 P. angustifrons Loew. 9 females, Columbus, Sandusky, Cin- 

 cinnati, Waterloo, Kent, Vinton, Lockbourne, Sugar Grove; first of Maj^ 

 to the last of Jul}'. 



14 P. bicolor Fabricius. For description of this species see Part II, 

 p. 53 where the inunature stages are also described. Many specimens are at 

 hand from Cohunbus, Lakeville, Sandusky, Waiiseon, Castalia, Vinton 

 and Gypsimi; early May to late August. 



15 P. tibialis Fallen. Descriptions of the life stages are given in Part 

 II p. 54. Numerous specimens, mostly males, Akron, Sandusky, Medina, 

 Vinton; middle of May to early August. 



Chilosia Meigen 



Key to Species (adapted from Hunter, 



Canad-Ent. Vol. XXVIII, pp. 229-233, September., 1896.) 



r Eyes bare, tibiae at least largely yellow 2 



2 Scutellum without bristles or bristle-like hairs on the margin 3 



Scutellum with bristles or bristle-like hairs on the margin 5 



3 Posterior femora largely reddish, or at least so colored at the base; second 



abdominal segment partly opaque; four anterior tibiae entirely yellow 



* prima Hunter ( Pa . ) 



Posterior femora except the tip always black 4 



4 Abdomen entirely shining in both sexes comosa 



Abdomen at least in the male largely opaque; four anterior tibiae entirely yel- 

 low; pile of front light colored capillata 



5 Arista briefly pubescent, femora yellow *pri}iia Hunter (Pa.) 



Arista plumose or long pilose, third antennal joint rounded-ovate or ovate. . 6 



6 Abdomen of both sexes entirely shining, anterior femora largely black 



.*cyanescens Loew (111., Conn., N. H., Montreal) 



Abdomen in the male largely opaque 7 



7 Posterior femora on basal third, and at apex, yellow; scutellum yellow except 



the narrow base pallipes 



Posterior femora except the apex black; scutellum only piceous at apex; first 

 posterior cell broader and last section of fourth longitudinal vein accordingly 

 longer tristis 



