40 ACADEMY OF NATURAL SCIENCES 



brown, crneiate mark on each, of which the transverse line if 

 black. 



Leno-th of female, three-fifths of an inch, male rather shorter. 



This species occurs not unfrequently on the banks of the Mis- 

 sissippi. The nervures of the wings correspond with those of the 

 wing represented on tab. 6, fig. 4, of Meigen's descriptions of 

 European Diptera. 



2. L. MACROCERA. — Blackish-piccous, polished ; wing three- 

 spotted ; antennae longer than the body. 



Inhabits East Florida. 



Rostrum, first and second joints of the antennas, and the in- 

 ferior portion of the front, yellowish ; vertex piceous ; antennae 

 hairy on all their length, third and fourth joints with a small 

 vertical spine at tip ; halteres and feet yellowish-white ; thighs 

 and tibia at tip dusky ; wings with three large fuscous spots, of 

 which one is near the base, the second on the middle of the cos- 

 tal margin not attaining to the edge, and the third forms nearly 

 a band across on the connecting nervures : abdomen less intensely 

 colored than the thorax, the three or four middle segments 

 pale-yellowish at base. 



Length three-tenths of an inch. 



The disposition of the wing nervures difiers from [21] any of 

 those represented by Meigen, but they are more like those of fig. 

 7, pi. 5, than any of the others. 



3. L. TENUIPES. — Thorax livid j humerus yellowish ; wings 

 dusky. 



Inhabits Pennsylvania. 



Antennae long, blackish ; vertex fuscous ; thorax livid ; hu- 

 merus reddish-yellow ; nervures arranged as in Meigen's fig. 2, 

 pi. Gj pleurae and pectus reddi.sh-ycllow ; feet long and slender, 

 blackish, pule at base; tergum brownish-livid, segments on their 

 posterior margins somewhat darker ; abdomen whitish. 



Length two-fifths of an inch. 



This species may be found in plenty during the autumn at 

 Harrowgate, in humid situations, in company with T. fiavicans 

 Fabr. 



[This species is united with L. liumeralu, below, by Wiede- 

 mann, as one species, under the name L. humcralis. — Sacken.] 



[Vol. IIL 



