36 THE CANADIAN ENTOMOLOGIST. 



black. Length 4-5 lines; with ovipositor 11-19 lines. ^ has antennre 

 brown, pale beneath; Jegs paler than in 9, the anterior eosce and trochan- 

 ters white, posterior legs more or less obfuscated, base of their tibiae and of 

 their tarsi white; abdomen with first segment about as long as second, with 

 two longitudinal ridges, most prominent at base. Length 2j-3 lines. 



JIab. — Ottawa (Billings) ; London (Saunders). Coll. Am. Ent. Soc. 

 This is the smallest and most slender of our North American species. 



9. Perithous pleuralis. — Ç. Black, shining ; anterior orbits, basal 

 margin of clypeus, mandibles, palpi, scape beneath, tip of acutellums, spot 

 beneath posterior wing, arched line on tip of metathorax, four anterior coxse, 

 all the trochanters, anterior legs in front, and posterior margin of abdominal 

 segments, interrupted laterally by a dusky spot, white ; scutellum, pleura, 

 sometimes the anterior portion of mesothorax, tibiae, and posterior coxae, honey- 

 yellow ; antennae brownish ; wings hyaline, iridescent, nervures brown, pale 

 at base, as well as a spot at base of stigma ; tibiaî and tarsi whitish, tips of 

 posterior femora, a line on outside of all the tibise, encircling the apex of 

 posterior pair, and tips of tarsal joints, blackish ; segments of abdomen 

 shining, with a lateral blister-like elevation on each, two basal segments 

 with thick coarse punctures, remainder with sparse punctures ; ovipositor 

 longer than body. Length 4^-6i lines. 



/7a&.— Grimsby, C.W. (Pettit). Coll. Am. Ent. Soc. Closely resembles 

 the European P. mediator', but differs in the ornamentation of the legs. 



10. Arenetra canadensis.' — %. Deep black, densely and coarsely 

 punctured; head, thorax and base of legs, thickly clothed with short black 

 pubescence, most dense on the head; antennae long, slender; wings hyaline, 

 nervures black, areolet small, triangular, subpetiolate ; apex of femora, the 

 tibiae and tarsi dull testaceous, posterior pair pale fuscous; abdomen narrow, 

 subdepressed, shining at tip, apical margin of third and following segments 

 with a very narrow pale fascia. Length 5 lines. 



Hab. — London, G. W. (Saunders). Coll. Am. Ent. Soc. Very closely 

 allied to A. nigrita, Walsh, which has the pubescence less dense, and whitish. 



11. LissoNOTA RUFIPES. — J. Black, somewhat shining; legs rufous, the 

 coxae, trochanters, and posterior tibiae and tarsi black ; middle tibise and 

 tarsi sometimes dusky ; wings dusky hyaline, iridescent, nervures black, 

 areolet small, petiolated; abdomen shining at tip; ovipositor longer than 

 body; body densely punctured, most sparse on abdomen. Length 4^- lines.. 



iZa5.— Grimsby, C. W. (Pettit). Coll. Am. Ent. Soc. 



12. LissoNOTA FRIGIDA. — ?. Black; head and thorax densely punctured, 

 opaque; abdomen shining, delicately punctured, polished at apex; wings 

 dusky hyaline, iridescent, areolet triangular, not petiolated ; legs, including 



