OF NATURAL UISTORY. G83 



as the abdomen, punctured: altdumen orbicular, jioli.-licil, iin- 

 puuctured : feet, two anterior pairs piceuus. [224] 



Length about one-filth of an inch. 



I agree with Leach in the propriety of .separating this group 

 from Eiania. In addition to the great dissimilarity of the ntu- 

 ration of the wings, the proportional length of the posterior Icct 

 and of the antennae is (j[uite different. 



PLMl'LA V. 



1. P. IITJMIDA. — Black; feet yellow ; thorax with white lines; 

 abdomen with white lateral spots. 



Inhabits Indiana. 



Body black, traiKsverscly rugulous ; anterior orbits and palpi 

 white: thorax with rather large, transverse wrinkles; wing-scale, 

 line before the wing, and two abbreviated dorsal lines white : wings 

 immaculate : nervures blackish ; stigma at base whitish ; .second 

 cubital cellule petiolated : scutel, posterior margin white : abdo- 

 men falcate; segments, excepting the first, with a rather large, 

 rounded, whitish, lateral spot : oviduct at least as long as the 

 body; pectus and feet honey-yellow: tarsi whitish, incisures 

 dusky : tibiae whitish, posterior pairs blackish at tip. 



Length over half an inch. 



Form and magnitude of P. ji/vrt/tis nob., which, however, is 

 destitute of white spots and lines. 



2. P.? PETIOLATUS. — Black; varied with yellowish-white; 

 second cubital cellule minute, petiolated. 



Inhabits Indiana. 



Body black, densely punctured : hypostoma, mouth and an- 

 tennae beneath whitish : thorax with a wide, white line before the 

 wings : wings hyaline ; nervures blackish ; stigma whitish towards 

 the base; second [225] cubital very minute, the petiole being 

 elongated : scutel dull honey-yellow : tergum densely punctured ; 

 two ba.sal segments with an elevated, abbreviated line ; that of 

 the second segment parted into several at ba.se, that of the first 

 segment dilated into a groove at ba.se ; basal segment with a 

 tubercle each side and an elevated line on the lateral margin, 

 continued on the sccuiul .'■'cgmcnt : pleura and pectus huney-yel- 

 low varied with white: coxaj and trochanters white; posterior 

 1835.] 



