OP PHILADELPHIA. 65 



2. L. PUNCTIPENNIS. — Blackish ; wings spotted j abdomen pale 

 at base. [35] 



Inhabits Pennsylvania. 



Hypostoma dark cinereous, with a fringe of long hair each 

 side ; antennjc, palpi and rostrum black • vertex blackish-fuscous ; 

 stethidium black ; thorax varied with cinereous lines ; pleura, 

 pectus and coxa3 dark cinereous ; feet pale brownish, thighs more 

 dusky ; poisers yellowish white ; wings hyaline, tip margin, con- 

 necting nervures, margin of the nervures near the thinner edge 

 of the wing, costal margin ending in a carpal spot, fuscous ; ter- 

 gum, four basal segments pale-yellowish, with a dusky basal 

 margin and triangular spot, remaining segments black. 



Length % more than one-fifth of an' inch. 



3. L. QUADRATA. — Pale yellowish; thorax lineated ; abdomen 

 fasciated ; wings with a large spot. 



Inhabits the United States. 



Body pale-yellowish ; head very slightly tinged with plumbe- 

 ous, excepting the antennae and mouth ; thorax with three dilated 

 longitudinal brown lines, of which the lateral ones are interrupted ; 

 scutel immaculate ; wings whitish, with a brown subquadrate 

 spot, extending from the margin to the centre of the wing, and 

 from near the anterior inner angle of the spot an oblique brown 

 line extends to the thinner margin, nervures brown, white at 

 base ; pectus and feet immaculate ; tergum with a black band at 

 the base of each segment; halteres with a dusky capitulum. 



Length to the tip of the wings more than seven-twentieths of 

 an inch. [36] 



This insect is most closely allied to the Atherix oculata Fab. 

 It occurs in Pennsylvania as well as in the State of Missouri. 



4. L. BASILARIS. — Blackish-fuscous j wings hyaline, base or 

 neck only fuscous. 



Inhabits Pennsylvania. 



Hypostoma in a particular light cinereous ; antennae dark tes- 

 taceous ; thorax and scutel with scattering golden-yellow hairs ; 

 pectus and pleura brown ; feet white, thighs at base and tips of 

 the tarsi brown ; tergum on the posterior margins of the 

 basal segments with yellow hairj venter immaculate, paler at 

 base ; 5 head cinereous, vertex and occiput spotted with black. 

 1823.] 



