OF PHILADELPHIA. 47 



4. I^ CINCTIPES. — Yellowish; wings varied with dusky; thighs 

 bifasciate beyond the middle. 



Inhabits Missouri. 



Body pale-yellowish ; thorax trilineate with black, intermediate 

 line double, terminating at the central incisure ; lateral lines in- 

 terrupted before, and continued posteriorly to their union at the 

 base of the tergum ; wings varied with blackish ; four distant 

 spots on the costal margin, of which the terminal one is semi-cir- 

 cular and the penultimate one is continued in a very irregular 

 band towards the thinner margin ; thinner margin with about 

 four much diluted spots, the terminal one being continued as a 

 band across the tip ; abdomen yellow, somewhat varied with [ 22 ] 

 black : thighs with two black annulations beyond the middle. 



Length about half an inch. 



The nervures of the wings agree with those of Meigen's fig. 5 

 of tab. 6, excepting that there are three nervures on the costal 

 margin as in his figures 5, 7 and 8 of tab. 5. 



5. L. HUMERALIS. — Dusky, beneath pale; wings hyaline im- 

 maculate. 



Inhabits Pennsylvania. 



Antennaa fuscous, first joint and rostrum dull-yellowish; front 

 and vertex dull cinereous ; thorax dark livid ; humerus, two ob- 

 solete lines, and lateral margin as far as the wings, yellowish ; 

 pleura and pectus pale yellow; scutel and metathorax color of the 

 thorax ; nervures dark brown, corresponding in arrangement with 

 Meigen's fig. 2, pi. 6; feet dark brown; tergum dull-yellowish, 

 with a black line ; venter white. 



Length two-fifths of an inch. 9 . 



6. L. ROSTRATA. — Feet elongated ; wings spotted ; rostrum 

 nearly three times as long as the head. 



Inhabits Pennsylvania and Maryland. 



Antennae, rostrum and vertex fuscous ; thorax cinereous, tri- 

 lineate with fuscous, the intermediate line abbreviated behind, 

 and the lateral ones abbreviated before ; wings with five fuscous 

 sub-equal spots on the costal margin, the penultimate one rather 

 largest, and a spot at each termination of a nervure at the inner 

 [23] margin and apex, the connecting nervures also are margined 

 with fuscous J feet pale. 



Length one quarter of an inch. 9 . 

 1823,] 



