56 ACADEMY OF NATURAL SCIENCES 



Length 9 one-fifth of an inch. S rather less. 

 The nervures of the wings are disposed as in Meigen's second 

 division." 



5. L. RUFITHORAX. — Yellowish-testacBOus ; wings dusky ; ter- 

 gum with a series of black spots. 



Inhabits Pennsylvania. 



Antennas dull testaceous, terminal joint black; labia fuscous; 

 thorax in a particular light with two dusky obsolete lines ; poisers 

 fuscous ; wings fuliginous, particularly on the costal edge, the 

 antepenultimate nervure uniting with the preceding one before it 

 attains to the inner edge of the wing ; tibia and tarsi dusky, hind 

 feet elongated, tibia and tip of the thighs above blackish, the 

 tarsi paler ; tergum [37] with a longitudinal fusiform black line 

 on each segment, those on the two basal segments rounded and 

 central, posterior segments blackish on their basal margins. 



Length two-fifths of an inch. 



Belongs to Meigen's first division. 



6. L. FUMiPENNis. — Wings dusky; tergum brown, annulate 

 with pale testaceous. 



Inhabits Pennsylvania. 



Hypostoma cinereous ; globular prominence, proboscis and an- 

 tennae yellowish ; thorax fuscous, posterior edge dull testaceous ; 

 scutel pale testaceous, fuscous at base ; wings, inner and terminal 

 margins hyaline; poisers brown; scapus whitish; feet white; 

 pleura and pectus yellowish-testaceous ; tergum fuscous, segments 

 yellowish testaceous on their posterior margins; venter yel- 

 lowish. 



Length rather more than one-fifth of an inch. 



Belongs to Meigen's second tribe. 



7. L. FASCIATA. [Ante, vol. 1, p. 28.] 



8. L. VERTEBATA. [Ante, vol. 1, p. 27.] [38] 



9. L. ALBicoRNis. [Ante, vol. 1, p. 27.] [39] 



10. L. PLUMBEA. — Blackish-plumbeous; wings clouded ; poisers 

 pale-yellow. 



Inhabits Pennsylvania. 



Thorax brown, with five obsolete cinereous lines ; wings with 

 a fuscous costal margin, and four dusky arquated bands which 

 do not attain the inner margin, the terminal one is obsolete and 



[Vol. III. 



