‘ 
184 AN ACCOUNT OF BRITISH FLIES. 
Legs stouter than Zermacer, and hind metatarsus 
is less than two-thirds of "the length of the hind 
O. incallidus, WIk, ... tibia (nearly allied to former). gth, 23 lin. 
(do). 
; Black. Abdomen greenish-black. Legs dingy 
Ouohianpeteey NU: « as whitish, slender. Length, 14 lin. ~ 
O. pagans Wik, .... | Crapiubr blacks ge ous sles aaa 
Black, stout. Thoraxshining. Abdomen pubes- 
sii A aN be 3 cent. Legs stout. peed 23 lin. (3). 
O. novatus, Wik. ... ___ | Cinereous-black. Legs dark brown, slender. 
Length, 14 to 2 lin. Common. 
Black, slender. Thorax wage eis three black 
almost confluent stripes. omen piceous, 
D1 ap neIsts, NMeta Vinee te black. Legs brown, long and slender. h, 
2h lin. (3): 
Testaceous. Thorax with three black stripes ; 
metathorax Ave ie Abdomen brown, first, 
. second and third veins testaceous ; discal trans- 
O) SORE MIN, “26. verse veinlet brown. Legs dull and testaceous, 
long ; tips of tibize and tarsi black. Length, 3 
lin. 
“ors Black. Thorax testaceous, with three broad black 
O. frigidus, Zett. ... ee stripes. Legs brown. Length, 1 lin. (3). . 
Testaceous. Thorax with three black stripes ; 
O seatipele tae metathorax black. Abdomen pale _ brown. 
. fe a ct Legs testaceous, slender ; tarsi and tips of tibize 
brown. Length, 1} lin. (2). 
Black, stout and pubescent. Legs piceous, pubes- 
O. lucens, Zett. cent, stout. ings blackish at the base ; veins 
white. Halteres brown. Length, 3 lin. (¢). 
\ Black. First, second and third veins testaceous, 
ae Halteres white. Legs dull, testaceous, tarsi 
( brownish. Length, # lin. (2). 
Black. Thorax shiny. Legs black, long and 
O. opplens, Wik... pa slender. Halteres white. Veins as above. 
Length, 1, to2lin. (2). 
O. minutus, Zett. 
Black. Thorax shiny. Veins white. Halteres 
brown. Legs ferruginous, pubescent. Length, 
2 lin. (¢). 
Hoary. Thorax with three black stripes ; abdo- 
men black, cinereous beneath. Legs tawny, 
long and slender. Length, 24 lin. (7). 
O. nitidicollis, Steph. } 
. Black. Thorax as above. First, second and third 
O. pergens, Wik. 
veins dark brown, rest pale brown. Yellow 
band on hind border of each abdominal segment. 
Legs black, stout. Length, 14 lin. (2). 
Black. First, second, and third veins black, rest 
brown. Probably the ¢ of deproperans (F.V.T.). 
Hoary, slender. Thorax as above. Veins white. 
Abdomen cinereous-black; sutures whitish. 
Legs piceous, rather long andslender. Length, 
24 lin. (3). 
| Gray. Abdomen black, hind borders of the seg- 
O. deproperans, Wik. 
O. obsistens (3), WIk. 
la 
O. pertractus, Wik. .. 
O. moturus, Wik. ments gray. Legs black, femora thick. 
Length, 13 lin. 
