1865.] 269 



and oblique. Legs stout, pale yellowish-fulvous, the posterior pair 

 more deeply tinged with fulvous. Abdomen elongate, slightly dilated 

 and depressed near the tip, smooth and highly polished ; basal segment 

 with a rather deep channel down the middle, and the apical segment 

 with a slight central groove. Length 4f lines ; expanse of wings 9 lines. 



One specimen. 



Genus EPHIALTES. Grav. 

 Ephialtes occidentalis, n. sp. 



Black : tegulse and legs, except hind tibiae and tarsi, pale ferruginous ; wings 

 hyaline. 



Female. — Deep black ; head smooth and polished ; palpi pale; an- 

 tennas black (apical half wanting). Thorax polished, clothed with 

 tine pale pubescence ; mesothorax smooth, somewhat rugose on the 

 disk behind the middle lobe, which is prominent ; pleura feebly punc- 

 tured ; scutellum polished ; metathorax minutely rugose, with a rather 

 deep central longitudinal channel, bordered on either side by a well- 

 defined carina which diverges and becomes obsolete before reaching 

 the tip ; tegulae yellowish-ferruginous. Wings hyaline, faintly tinged 

 with yellowish, and stained with honey-yellow at extreme base, iride- 

 scent; nervures and stigma black, the former honey-yellow at base; 

 areolet triangular. Legs long, pale ferruginous ; posterior tibiae and 

 tarsi blackish ; middle tarsi dusky. Abdomen elongate, slender, cov- 

 ered with very minute, dense, transverse strife; five basal segments 

 long, narrow, subequal, each being about three times longer than wide, 

 the sixth segment about half the length of the fifth, basal segment de- 

 pressed on the disk, with two central and a lateral, well-defined carime, 

 the base broadly excavated ; second segment with an oblique deeply 

 impressed line on each side ending in a depression on the lateral mid- 

 dle ; third and the following segments with a longitudinal depression 

 on the lateral middle; extreme apex of the segments shining, promi- 

 nent on the disk and excavated on each side ; ovipositor very slender, 

 ferruginous, about half again as long as the body, valves black, very 

 finely pubescent. Length 14t> lines, of ovipositor 22 lines; expanse 

 of wings lf>2 lines. 



One specimen. Closely allied to E. manifestator Linn. (Europe), 

 but the hind legs, segments of the abdomen, and the ovipositor, are 

 much longer and the abdomen is much narrower than in that species ; 

 the coloration is much the same in both species. 



Genus RHYSSA, Grav. 

 1. Rhyssa Nortoni, Cresson. 



Rhyssa Nortoni, Cresson, Proc. Ent. Soc. Philad. iii, p. 317. 

 One $ specimen. 



