OP NATURAL HISTORY. 761 



the second cubital cellule and second recurrent nervure maro-ined 

 with whitish, the latter abbreviated before the anal tip : abdomen 

 subsessile; with the exception of the first segment, piceous 

 blackish : feet honey-yellow. 



Length over three-twentieths of an inch. ' 



The second cubital cellule is somewhat larger than usual, and 

 the nervures which form it, as well as the second recurrent ner- 

 vure, are less distinct than usual. 



2. P. ANNULATUS. — Black; mandibles white ; feet yellowish. 



Inhabits Indiana. 



9 Body black, polished, minutely punctured : antennae, basal 

 joint white; second joint piceous : nasus prominent in the mid- 

 dle : mandibles and palpi white : wing-scale dull honey-yellow ; 

 wings hyaline ; nervures blackish, tinged with yellow at base ; 

 first and second cubital cellules receiving their appropriate re- 

 current nervures : metathorax with larger punctures and lines : 

 abdomen polished, impunctured, subsessile, the petiole being very 

 short : pleura with a small whitish dot under the wing-scale : 

 feet honey-yellow. 



Length one-fifth of an inch. [380] 



% Hypostoma silvery : nasus rounded : antennae annulate, 

 one-half of each joint being yellowish. 



Length over three-twentieths of an inch. 



ALYSON Jur. 



1. A. OPPOSITUS. — Black; feet honey-yellow; tergum with 

 two yellow spots. 



Inhabits Indiana. 



9 Body black : mouth, hypostoma and anterior orbits yellow : 

 antennge at base beneath yellow : thorax with an obsolete yellow 

 spot before the wings each side : wings very slightly tinted with 

 dusky, more particularly in an obsolete band toward the tip : ner- 

 vures fuscous : stigma brown : recurrent nervures entering the 

 petiolated^ cellule exactly opposite to its bounding nervures: 

 spines very short : feet honey-yellow : tergum polished, first 

 segment honey-yellow; second segment with a large, lobately- 

 rounded, bright yellow spot each side at base; the base is also 

 obsoletely honey-yellow. 

 1837.] 



