OF NATURAL HISTORY. 683 



as the abdomen, punctured: abdomen orbicular, polished, im- 

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



Length about one-fifth of an inch. 



I agree with Leach in the propriety of separating this group 

 from Evania. In addition to the great dissimilarity of the neu- 

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

 and O'f the antennae is quite different. 



PL^IPLA F. 



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

 abdomen with white lateral spots. 



Inhabits Indiana. 



Body black, transversely 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. pterelas 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- 

 tennas 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 basal segments with an elevated, abbreviated line ; that of 

 the second segment parted into several at base, that of the first 

 segment dilated into a groove at base ; basal segment with a 

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

 continued on the second segment : pleura and pectus honey-yel- 

 low varied with white : coxae and trochanters white ; posterior 

 ]835.j 



