THE CANADIAN ENTOMOLOGIST. 35 



recurrent nervure unites with the transverse cubital nervure, by which 

 character it may be readily distinguished from amoenus. Length 5^ lines. 



Eab.— Ottawa, (Billings). Coll. Am. Ent. Soc. 



6. CoLEOCENTRUS Pettiti. — §. Black, somewhat shining ; wings yellow- 

 ish-hyaline, nervures black, honey-yellow at base, areolet small, triangular, 

 petiolated ; legs honey-yellow, coxae and posterior tibige black, posterior tarsi 

 yellow, dusky at base ; abdomen broad at apex, which is compressed and 

 bhining ; ovipositor as long as body. Length 6 J lines, 



i/a6.— 'Grimsby, C. W. (Pettit). Coll. Am. Ent. Soc. In this genus the 

 last ventral segment is long and lanceolate, as in Arotes, but which has the 

 areolet of anterior wings wanting. 



This fine species is respectfully dedicated to Johnson Pettit, Esq., of 

 Grimsby, to whom I am indebted for many specimens of Canadian Hymen- 

 optera. 



- 7. Rhyssa CANADENSIS. — Ç. Black, shining; anterior orbits, interrupted 

 on each side of antennae, palpi and tegulae white ; antennae brownish at tip 

 and beneath ; mesothorax coarsely transversely rugose ; metathorax with a 

 broad, deep, longitudinal channel on the disk; wings hyaline, faintly stained 

 with yellowish, nervures black, pale at base, as well as extreme base of 

 stigma, areolet minute, petiolated, sometimes reduced to a mere point ; legs 

 bright honey-yellow, tips of all the tarsi, extreme tips of posterior femora, 

 and base and apex of their tibiae, fuscous, middle of tibiae pale; abdomen 

 long, minutely transversely aciculate ; ovipositor longer than body, piceous, 

 sheaths black. Length 7-8 lines. 



Hah. — Quebec (Couper). Coll. Am. Ent. Soc. Mr. Couper informs me 

 that this insect was found " boring into a pine tree." 



8, Ephialtes macer.— 9- Slender, black, shining, with short, thin, 

 glittering, cinereous pile; cheeks and sides of thorax polished; clypeus 

 reddish ; palpi whitish ; metathorax with a shallow central channel ; tegulae, 

 and sometimes a short line in front, whitish ; wings hyaline, beautifully 

 iridescent, nervures brown, areolet triangular ; legs honey-yellow, front coxae» 

 except dusky spot in front, their trochanters, and apex of four posterior 

 trochanters, whitish ; tips of posterior femora, their tibiae and tarsi more or 

 less dusky, the tibiae more or less pale at middle and within, and sometimes 

 the middle tibiae and tarsi are varied with dusky, the posterior coxae in one 

 specimen are dusky behind; abdomen long, cylindrical, surface uneven, 

 densely punctured and somewhat shining, subpubescent, posterior margin of 

 the segments unevenly transversely wrinkled, first segment shorter than 

 second, the second to fifth one-third longer than wide; ovipositor twice, 

 sometimes nearly four times longer than body, very slender, rufous, sheaths 



