LONG S SECOND EXPEDITION. 207 



angle, a third to the carpal spot, and a fourth towards the base, 

 interrupted in its middle; dorsal margin, particularly towards 

 the base, fuscous ; surface with scattered hairs, those of the ner- 

 vures more distinct and blackish ; tibiae and tarsi with black setie. 

 Length to tip of wings seven-tenths of an inch. 



3. P. sericea. — Blackish, sericeous; wings varied with fus- 

 cous and sericeous. 



Inhabits North-west Territory. 



Head with a cinereous gloss, and a few long hairs ; antennas 

 brown, incisures margined with yellowish ; basal joint color of 

 the head ; thorax with a cinereous gloss in a particular light ; 

 superior wings varied with pruinose and fuscous ; a transverse, 

 quadrate, blackish spot on the middle of the inner margin ; hairs 

 numerous, minute, those of the nervures larger and black ; in- 

 ferior wings immaculate; posterior pairs of feet pale ochreous 

 sericeous, with black setae. 



Length to tip of wings more than two-fifths of an inch. 



MANTISPA Ulig. Latr. 

 M. brunnea. [Ante, p. 54.] 



ORDER HYMENOPTERA. [310] 



XYELA Dalman. 



X. ferruginea. — Ferruginous; thoracic spots and base of 

 the abdomen blackish. 



Inhabits Arkansa. 



Antennae fuscous, basal joint ferruginous above the antennae 

 [311] and extending between the eyes is a transverse black spot; 

 thorax each side above the base of the superior wings with a 

 longitudinal blackish spot, connected behind with a transverse, 

 almost indefinite one ; metathorax blackish behind ; wings hya- 

 line, slightly tinged with yellowish, nervures brown; terguni, 

 three basal segments black, remaining segments obsoletely blackish 

 on their posterior margins ; posterior pairs of the tibiae six-spined, 

 one on the middle, one beyond the middle, and the other at tip. 



Length to tip of oviduct seven-twentieths of an inch. 



This [interesting insect was presented to me by Mr. Thomas 

 Nuttall, who obtained it during his expedition to Arkansa. The 

 forms of some of the wing cellules differ a little from tins, oi 



