48 ACADEMY OP NATURAL SCIENCES 



On flowers : this species resembles L. hngirostris Wied. in the 

 form of the rostrum and the arrangement of the nervures, and 

 with that insect it seems entitled to be separated from Limnobia 

 as a distinct genus. 



[Belongs to Aporosa Macq. — Sacken.] 



TIPULA Linn. Meig. 



1. T. CUNCTANS. — Wings with a fuscous costal margin : ter- 

 gum with a dusky line. 



Inhabits Pennsylvania. 



Rostrum, mouth and base of the antennae pale reddish-yellow, 

 flagellum dusky ; front and vertex cinereous ; collar pale, with a 

 dusky line ; thorax brown, two pale distant lines on the disk, 

 confluent behind, and another on each side passing over the wings ; 

 wings dusky ; nervures fuscous ; the fuscous costal margin is in- 

 terrupted near the stigma, by an obsolete, pale spot ; poisers 

 dusky, stipes yellowish ; feet blackish ; thighs and tibia, paler at 

 base ; pleura gray ; abdomen, pa.le brownish-yellow, with a dis- 

 tinct dusky line on the tergum, the segments of which are also 

 margined behind with dusky. 



Length four-fifths of an inch. 



Arrangement of the nervures like that of the preceding species- 



2. T. COSTALIS. — Wings with a fuscous costal margin ; [24] 

 antennae annulate ; segments of the tergum with an interrupted 

 transverse line. 



Inhabits Pennsylvania and 31aryland. 



Head cinereous ; rostrum and antennae yellowish, segments of 

 the latter, excepting the three basal ones, fuscous at base ; tho- 

 rax yellowish brown, with a darker line ; scutel and metathorax 

 pale ; pleura whitish ; feet dull yellowish-brown ; wings with a 

 brown costal margin extending to the extremity of the carpus ; 

 tergum light yellow-brown, segments with a fuscous posterior 

 margin, and two linear spots placed in a line transversely. 



Length three-fifths of an inch. 



The arrangement of the nervures of the wings is nearly simi- 

 lar to that of Meigen's fig. 9 of pi. 6. 



3. T. MACROCERA. — Pale-yellowish ; antennae elongated. 

 Inhabits Pennsylvania. 



Inferior longitudinal half of the rostrum, reddish-brown ; palpi 



[Vol. III. 



