214 EDWARD NORTON. 



uent and rounded at tip. Occiput generally with a discoidal black 

 cloud. Antenna? full one-half as long as body, the scape black, flagel- 

 lum brown-black. A broad vitta on the anterior two-thirds of the an- 

 terior mesothoracic lobe, sometimes reaching to the scutel, the whole 

 of the lateral lobes or sometimes only the interior third of each, the 

 extreme base and tip of scutel, sometimes connected by a black line, 

 the entire pectus and part of the pleura, so as to leave above a large, 

 triangular, honey-yellow spot of variable size, and a cloud on lower 

 corner of anterior angle, black. Metathorax black, the basal plates 

 occasionally with a discoidal honey-yellow cloud on each side. Tergum 

 black, sometimes on all but the last segment, sometimes on one or two 

 or three basal segments, with several of the following sutures dusky; 

 venter and side plates honey-yellow, also the cerci, with dusky tips. 

 Ovipositor greenish-white, its sheaths black. Legs greenish-white, the 

 hinder pair sometimes pale honey-yellow, the tips of hinder tibia) and 

 all the tips of tarsi dusky. Wings hyaline, veins black; costa and 

 stigma pale dusky, sometimes the costa and basal half of stigma dull 

 greenish-white. 



% . Differs from 9 only in having the ocellar spot much larger and 

 the disk of the occiput black, the aotenntB two-thirds as long as the 

 body, the meso- and metathorax entirely black, lateral plates basally 

 black, the whole of the hind tarsi dusky, the costa and stigma black. 



Rock Island, 111. 



One S , three $ . April 17 — 18 from the Cecidomyidous gall S. 

 rhodoides, AValsh. It is much like the pale variety of JVnnafus s. des- 

 modioides, Walsh. It may be the same with N. placenhis, n. sp., 

 which is, however, larger and with diiferent shades of color. In a spe- 

 cimen received from jMr. Walsh I find a central pale spot in middle of 

 pectus, which is not noted by him in his description. 



37. N. longulicornis.* 



Nematus longlcorni'i, Say, Bost. Jour, i, 18.35, 219, .3. 



Norton, Proc. Bost. Soc. viii, 15S, 4, 9- 

 Black; orbits, face below antennse, tegulse, anterior angle, pleura, (except a 

 black spot,) the whole body beneath and legs whitish. Length 0.26. Br. wings 

 0.54 inch. 



9 . Body rather long. Antennae black, more than two-thirds the 

 length of body, slender, third and fourth joints equal; head rather 

 smooth, sutures at sides of ocelli distinct; lower ocellus in a basin, 

 which is smooth and shining, obovate, with distinct edges; nasus an- 

 gulate emarginate ; labrum emarginate ; a spot on vertex, from anten- 



* Escholz named a Nematus longicornis in 1822. 



