212 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.49. 



According to Mr. Snyder's notes the larva of Pteronidea aceris feeds 

 on Acer spicatum. His notes are as follows: 



"May 26, 1913. Sawfly larva feeding on under surface of leaf; 

 green with blackish spots; moulted a few hours later to pale green 

 w^th a yellow band near the end of the abdomen. 

 "May 27, 1913. Cocoon spun." 



Genus LYGAEONEMATUS Konow. 

 LYGAEONEMATUS ROBINSONAE, new species. 



Readily separated from Lygaeonematus Winnipeg by having the 

 upper part of the mesepisternum and part of the mesoscutum marked 

 with pale and by characters of the head. 



Female. — Length 7.5 mm. Apical margin of the labrum obtusely 

 rounded; clypeus short, not as long as the labrum, the apex truncate; 

 supraclypeal area triangular in outline, strongly convex; the upper 

 margin more prominent; supraclypeal foveae deep, small, puncti- 

 form, not connected with antennal foveae; middle fovea elongate, 

 confluent with the depression in front of the anterior ocellus; frontal 

 crest obsolete; ocellar basin four-sided, the upper walls nearly 

 obsolete, meeting on the postocellar furrow well above a line drawn 

 tangent to the upper margin of the lateral ocelli; lower wall of the 

 ocellar basin low, rounded, uninterrupted on the median fovea; post- 

 ocellar area parted by a depression, well defined laterally, a little 

 more than twice as wide as the cephalo-caudad length; postocellar 

 furrow angulate anteriorly and not sharply defined; antennal furrows 

 complete above the lateral angulation made by the ocellar basin; 

 antennae slender, tapering apically, the third joint slightly shorter 

 than the fourth; head and thorax shining; stigma broader at base, 

 gradually tapering to an acute apex; first transverse cubitus obsolete; 

 second recurrent almost interstitial with the second transverse 

 cubitus; third cubital cell parallel-sided, a little more than twice 

 as long as its apical width; upper and lower discoid'al cells in the 

 hind wings of nearly equal length, the lower being slightly shorter; 

 abdomen shining; sheath straight above, tapering from an acute apex 

 to a broad base. Black, marked with pale ; following parts are black : 

 Antennae, spot opposite the lower lateral walls of the ocellar basin, 

 the ocellar area, spot on the prescutum, spot on the scutum, apex of 

 the scutellum, metanotum, mesepisternum, sides of the episternum, 

 and all the tergites except the apical two; remainder of the insect 

 pale yellow; legs pale; bases of the coxae, bases of the femora (more 

 broadly beneath) and apices of the posterior tibiae black; anterior 

 tai"si apically, and posterior tarsi infuscated; wings hyaline, slightly 

 iridescent; venation black except the pale yellow costa and stigma. 



Boulder, Colorado. Described from one female collected May 9, 

 1914, by Elizabeth Kobinson, for whom the species is named; speci- 

 mens transmitted by Prof. T. D. A. Cockerell. 



Type.— C&t. No. 14862, U.S.N.M. 



