THE CANADIAN ENTOMOLOGIST. 299 



Owing to ihe fact that Mr. Walsh's description of Euiira S. nodus is 

 given in a comparAtive way with reference to Euura S. ovum, a descrip- 

 tion of the latter is inserted here before the description of the former. 



Imago. — Euura S. ovum, n. sp.— Shining honey-yellow. Head, with 

 the eyes, a square spot enclosing the ocelli, but separated from the eyes 

 by a pretty wide orbit, and also the tips of the mandibles, all black. 

 Clypeus emarginate, in a circular arc of about 90 degrees. Labrum 

 rounded at the tip. Occiput more or less clouded with black on the disk. 

 Antennae dull rufous above, with their basal one-half black, honey-yellow 

 below, with the scape, black, and more or less of the basal half of the 

 flagellum dusky, three-fifths as long as the body, joints three to five 

 subequal, four slightly the longest, five to eight very gradually becoming 

 shorter, nine fully as long as eight. Thorax with an oblong spot on the 

 anterior lobe of the mesoi-otum, generally extending from the collar two- 

 thirds of the way to the hind angle of the lobe, rarely covering almost its 

 entire surface; anterior disk of the mesonotum, and the edges cf the basal 

 plates that border on the basal membrane, or rarely the entire surface of 

 the basal plate, all black. Ccnchri whitish. A more or less black cloud on 

 the pectus, and another on the posterior disk of the pleura, the former 

 occasionally obsolete. Abdomen with that part of the anterior edge of 

 joint one that borders the whitish basal membrane, or rarely the basal 

 one half of joint one, black. Ovipositor honey-yellow, the tarsal claws 

 dusky. Wings hyaline, veins black ; those on the costa, as well as the 

 basal one-half of the stigma, whitish or yellowish, the rest of the stigma 

 dusky. Length of female .17 to .22 inch. Front wing of female .18 to 

 .24 inch. 



Euura S. ovum male differs from the normal female only as follows : 

 First, the ground colour is greenish-white, not honey-yellow ; second, the 

 black spot enclosing the ocelli is larger, and is separated from the eyes 

 only by a narrow orbit, and occasionally touches them for a small space ; 

 third, the occiput, except the orbit, is distinctly black ; fourth, in the 

 antenuce the pale colours are more dominant, and verge more or less on 

 greenish-white, and the antennae are three-fourths, not three-fifths, as long 

 as the body ; fifth, the thorax is black, except the tegul^, the superior 

 margin of the collar, and the cenchri, which are all greenish-white; sixth, 

 the abdomen is black above, greenish-white below, the lateral plates 

 basally black, but terminally clouded with the pale colour. Basal mem- 

 brane white. Seventh, the legs are greenish-white, sometimes, especially 



