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 ; surfiice with scattered hairs, those of the ner- 

 vures more distinct and blackish ; tibial and tarsi with black seta?. 

 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 ; antennae 

 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 j hairs 

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

 ferior wings immaculate ; posterior pairs of feet pale ochreous, 

 sericeous, with black set33. 



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



MANTISPA Illig. Latr. 

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



ORDER HYMENOPTERA. [310] 



XYELA Dalmau. 



X. FERRUGINEA. — Ferruginous J 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 ; tergum, 

 three basal segments black, remaining segments obsoletely blackish 

 on their posterior margins ; posterior pairs of the tibije 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 those of 



