314 APPENDIX. 



Inhabits Pennsylvania. 



9 Body black, polished ; labrum white, with a dilated, 

 longitudinal, fuscous line ; thorax with an oblique, white, 

 abbreviated line at the base of the superior wings ; scuteL 

 with a transverse white line ; metathorax with a longitu- 

 dinal white triangle ; wings hyaline, nervures fuscous ; the 

 small nervure which divides the first marginal cellule from 

 the first submarginal cellule is abbreviated and does not 

 reach the margin ; feet pale rufous, tibiae with a white ab- 

 breviated line on the exterior side near the knees ; poste- 

 rior tibiae and tarsi black ; abdomen compressed, acutely 

 edged above beyond the middle 5 first and second segments 

 rufous. 



Length seven-twentieths of an inch. 



This may be readily distinguished from the preceding 

 species as well by its inferior size and colour, as by the 

 remarkable abbreviation of the dividing nervure of the first 

 marginal and submarginal cellules. 



HYLOTOMA, Latr. 



H. dulciaria. $ Pale rufous ; head, wings, and feet vio- 

 laceous-black. 



Inhabits North-west Territory. 



^ntennse black, with a slight violaceous tinge ; pectus 

 with a large, well defined black spot, tinged with violace- 

 ous 'ffeet hardly tinged with violaceous ; abdomen yellow; 

 tail black. 



Length to tip of the wings nine-twentieths of an inch. 



This species was found by Dr. Bigsby, to whom I am 

 indebted for the specimen. It seems to be allied to the pec- 

 toralis, Leach, of which, however, the wings are " luteo- 

 hyalinse." 



