OF PHILADELPHIA. 45 



Hues ; venter yellow, obsolete central vitta and posterior margins 

 of tlie segments, blackish. 



Length about seven-tenths of an inch. 



2. C. ABDOMiNALis. — Abdomen bright fulvous, margined with 

 black ; wings spotted with fuscous. 



Inhabits Pennsylvania. 



Head dull yellowish ; rostrum, palpi, and antennas, dark fus- 

 cous : front with a transverse black line at the base of the an- 

 tennae, and another each side from the antennae to the rostrum ; 

 occiput dusky ; thorax cinereous, a double black longitudinal line 

 abbreviated behind, and three black spots on each [19] side, 

 whereof two are oblong, and the intermediate one subquadrate; 

 collar pale, with three black spots; scutel dirty yellowish, an oblique 

 black spot on each side of it ; pleura gray, with a longitudinal 

 vitta from the head to the abdomen ; wings with four fuscous 

 spots on the costal margin, and a minute one beyond the carpus ; 

 nervures fuscous, slightly margined, the middle furcate one sub- 

 margined with white, costal margin between the spots white, pos- 

 terior margin from the ultimate nervure to the apex with alter- 

 nate fuscous and white spots ; tergum bright fulvous, basal and 

 apical segments, and a wide lateral vitta, black ; venter paler 

 fulvous, posterior segments shaded with dusky, and with a longi- 

 tudinal black line; feet black, a white annulus at base of the 

 tibia ; thighs pale with a black annulus at tip. 



Length one and a half inches. 



This is one of our largest and finest species of Linnsean Tipula. 



LIMNOBIA Meig. 



1. L. FASCiAPENNis. — Wings white, with four fuscous mar- 

 bled bands ; feet pale, blackish at the tips of the thighs. 



Inhabits the United States. 



Body above rufo-cinereous ; eyes deep black; antennae fuscous, 

 first and second joints black, third and fourth, yellowish ; palpi 

 black; wings white, [20] with about four, much dilated, mar- 

 bled, dark brown bands, of which one is terminal, and one elon- 

 gated to the base, a small costal spot between the second and 

 third bands ; halteres dusky, capitulum white ; feet pale rufous, 

 thighs tipped with fuscous; abdomen, segments with an obsolete, 

 1823.] 



