348 EDWARD NORTON. 



Larvae, little known. Latreille states that they live " in the interior 

 of vegetables or in old wood." 



A. — Antennsc 9-jointed; third submarginal cell with two recurrent nervures. 

 ]. X. ferruginea. 



Xyelaferruginea, Say, Long's 2nd. Exj]. ii. 1824, 310. 



"Ferruginous; thoracic spots and base of the abdomen blackish. Length to 

 tip of oviduct seven-twentieths of an inch. 



" Antennae fuscous, basal joint ferruginous; above the antennae 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; me- 

 ta thorax blackish behind ; wings hyaline, slightly tinged with yellowish ; 

 nervures brown ; terguiu, the three basal segments black, remaining 

 segments obsoletely blackish on their posterior margins ; posterior pairs 

 of the tibias 6-spined, one pair on the middle, one pair beyond the 

 middle, and one at tip. 



'' Arkansa." 



Not seen. The neuration of this and the three following species 

 differs from that of European species, and as Mr. Say remarks, will 

 warrant a separation into another section. "The first radial (marginal) 

 cell receives one recurrent nervure, the second none and the third two. 

 The first is nearly square, slightly oblong, nearly two-thirds the size of 

 the second, which receives no recurrent nervure and is somewhat small- 

 er than the third, which receives two. The maxillary palpi are much 

 shorter than in the Swedish genus. 



2. X. tricolor. 



Xyda tricolor, Norton. Proc. Ent. Soc. Phil. i. 1S62, 144, %. 



Color steel blue, rufous and black. Length 0.30. Br. wings 0.72 inch. 



% . — Antennae black, 9-jointed, body steel blue; spots at insertion 

 of antenniB, nasus, labrum, mandibles, palpi and edges of ventral seg- 

 ments, white ; nasus edged with black, emarginate ; mandibles triden- 

 tate, inner edge rufous; legs rufous; tips of posterior femora, the tibiae 

 and tarsi black; intermediate tibiae with five, posterior with six spurs; 

 wings hyaline, stigma black, nervures as in X. infascata except the 

 costal space, which is widened and divided by a slender longitudinal 

 nerve, which opens into a Y near the stigma. The underwings have 

 three inner cells, two of which are submarginal. 



Kansas. One specimen (Coll. Am. Ent. Soc). 



