244 DIPTERA OF NORTH AMERICA. [PART II. 



with ciliatus. Five species have to be recorded as synonyms of 

 others ; these are radians Macq., as a synonym of longicornis 

 Fab., sipho Macq. of jucundus Loew, gemmifer Walk, of sipho 

 Say, amatus Walk. of. patibulatus Say, and inficitus Walker, 

 likewise of patibulatus Say. 



Table for the determination of the Species. 



, ( Tegulae with black cilia. 2 



I Tegulse with pale cilia. 15 



2 ( Wings with a darker picture. 3 



v Wings without picture. S 



f Wings black, hyaline only at the tip and the hind margin. 



1 dimidiatns Lw. 



j Wings hyaline, with two black fasciae connected on the anterior mar- 

 gin. 4 

 i Feet of the predominantly yellow. 5 

 ( Feet of the predominantly black. 6 

 ("First joint of the middle tarsi of the with a few ordinary bristles 

 upon the anterior side. 2 sipho Say. 

 1 First joint of the middle tarsi of the $ closely ciliated with short 

 erect bristles on the anterior side. 3 scaber Lw. 

 i Face hairy. 4 patibulatus Say. 

 \ Face without hairs. 7 

 r, ( Feet in both sexes entirely black. 5 melampus Lw. 

 I Feet in both sexes not entirely black. 8 

 "Middle tibiae and first joint of the middle tarsi of the ciliated on 

 the upper side. 6 pilosus Lw. 

 Middle tibiae and first joint of the middle tarsi not ciliated on the 

 upper side in the $ . 7 jucundns Lw. 

 'First longitudinal vein much prolonged beyond the middle of the 

 wing. 8 ciliatus Lw. 

 First longitudinal vein reaching at the utmost as far as the middle of 

 the wing. 10 



{Arista extremely elongated, apparently apical. 9 comatus Lw. 



Arista not very elongated, distinctly dorsal. 11 



!Fore tibiae of the , fore and middle tibiae of the 9 > yellow. 

 10 chrysoprasius Walk. 

 All tibiae of the $ , in the 9 also the femora, yellow. 12 



r The first joint of the middle tarsi of the beset with crooked bris- 

 12] ties. 13 



( The first joint of the middle tarsi of the plain. 14 



Tip of the abdomen of the with moderately long hairs. 



11 scobinator Lw. 

 Tip of the abdomen of the with exceedingly long hairs. 



12 caudatulus Lw. 



