LONGS SECOND EXPEDITION. 217 



3. B. ligator. — Black, abdomen and feet rufous, antennae with 

 a white annulus. 



Inhabits Pennsylvania. 



9 Vertex and occiput impunetured ; annulus of the antennas 

 placed beyond the middle ; palpi piceous; stethidium with eon- 

 fluent punctures ; thorax with two dilated, abbreviated longitu- 

 dinal, dull rufous lines; scutel with a dilated, longitudinal, dull 

 rufous line; wings hyaline, nervures fuscous; metathorax dull 

 rufous ; feet rufous, tarsi blackish at tip ; posterior thighs with 

 a strong tooth beneath near the tip; posterior tibia) fuscous; 

 posterior tarsi whitish ; tergum punctured, glabrous at tip ; ovi- 

 duct blackish. 



Length seven-twentieths of an inch. 



4. B. stigmator. — Dark yellowish-rufous; metathorax and 

 segment of the tergum black. 



Inhabits North-west Territory. 



Antennae as long as the body, dusky towards the tip ; vertex 

 between the stemmata black; occiput all round the neck, black- 

 ish; metathorax above and on the sides black; pleura with a 

 blackish, dilated, longitudinal line; pectus with a blackish, dilated 

 line before the anterior feet, [324] reaching near the head ; wings 

 hyaline; nervures fuscous; stigmata rather large, triangular, 

 fuscous, dull white at the anterior and posterior tips, and also on 

 the costal edge ; tergum paler, disk of the first segment blackish. 



Length less than one-fifth of an inch. 



This insect is one of the many species that deposit their 

 in great numbers in the larva of Lepidopterus insects. In a dead 

 and dried larva, which I found adhering to a tree, were the fol- 

 licles of forty or fifty individuals of this species. It varies some- 

 what in the quantity of the black coloring with which it is marked. 

 In some specimens this extends not only along the pectus, but is 

 continued in a capillary line along the edge of the thorax, the 

 metathorax also is entirely black, the tergum is blackish at tip 

 and on the sides, the pectus has a black spot in the middle, ami 

 the hypostoma has a transverse, blackish spot. 



