228 long's second expedition. 



Length nearly half an inch. 



I have not seen the female, the male is in the collection of Mr. 

 William W. Wood. 



ASTATA Latr. 



A. UNICOLOR. — Deep black, immaculate ; wings dusky at tip. 



Inhabits North-west Territory and Missouri. [338] 



9 Head with rather long, silvery hair ; thorax and scutel with 

 remote punctures, the former with a very slight appearance of 

 longitudinal lines before, the latter with a longitudinal impressed 

 line at tip, metathorax with dense, dilated punctures ; wings hya- 

 line, with a broad, dusky tip, nervures black ; tarsi piceous : ab- 

 domen polished, immaculate. 



Length less than half an inch. 



OXYBELUS Latr. 



0. 4-notatus. — Black ; tergum with a slight, whitish, abbre- 

 viated line on each side of the first and second segments. 



Inhabits Pennsylvania. 



Antennae towards the tip beneath, stethidium, immaculate; 

 wings byaline, nervures brown ; metathorax and scutel each with 

 three raised lines, two superior spines of the former whitish at 

 tip, decurved ; inferior spine larger, black , tarsi testaceous at 

 tip ; anterior tibiae testaceous on the inner side ; tergum polished ; 

 lateral abbreviated line of the first segment much more distinct 

 than that of the second. 



Length nearly one-fourth of an inch. 



GORYTES Latr. 



G-. bipunctatus. — Black, collar and scutel with a white line ; 

 tergum with two white spots. 



Inhabits Pennsylvania. 



Hypostoma silvery white; basal joint of the antennas before, 

 exterior base of the mandibles and palpi, white ; line of the collar 

 capillary of the scutel broader, abbreviated ; [339] wings hyaline, 

 nervures fuscous ; pleura with a small dot before the wing ; feet 

 black ; tibise sericeous, white on the exterior base ; tarsi white ; 

 tergum, second segment at tip each side with a small white spot. 



Length three-tenths of an inch. 



This species corresponds in its generic characters precisely with 



