364 EDWARD NORTON. 



legs dark ferruginous ; coxse and base of hinder pair blaclcish ; wings 

 as in female. 



Canada, Colorado (Coll. Am. Ent. Soc.) H. B. T., Youkon River, 

 Arct. Am. (Smith. Inst.). 5 9,1 % . 



This is either the U. Spectrum of Europe or closely allied to it. 

 Klug separates U. Spectrum from other species by the palpi : max- 

 illary uni-artieulate ; labial tri-articulate. I have not examined the 

 palpi of this species^ which are retracted. 



5. TREMEX, Jurine. 

 Tremex Jurine. 

 Xyloterus, Ilarting. 

 Sirex, Linn., Fabr. &c. 

 Wings with two marginal cells, the second incomplete, and three sub- 

 marginals, the second large, receiving two recurrent nervurcs; lance- 

 olate cell with oblique cross-line ; under wings with two inner cells. 

 Antennse filiform, shorter than to base of thorax, 13 or li-jointed. 

 Maxillary palpi 1-articulate, labial palpi, 2-articulate, the second 

 thick and hairy, body and ovipositor like that of Urocerus ; anterior 

 tibiae and tarsi depressed, the posterior pair long and flattened, the 

 first tarsal joint of females as long as tibiae, and of males much flatten- 

 ed and wide. 



Habits like Urocerus. 



1. T. columba. 



Sirex col umba, Fabr. Syst. Ent. 1775, 325, 2; Spec. Ins. i, 1781, 418, 2; Mant. 

 Ins. 1787, 257, 2; Ent. Syst. ii, 1795, 105, 3; Syst. Piez. 1804,49, 3. Linn. Syst. 

 Xat. ii, 929, 2; Amosn. Acad, vi, 412, 88. 



Sirex ductus, Drury, Exot. Ins. ii, App. 



Sirex penny Ivanicus, DeGeer, Ins. iii, 393, 1, tab. 30, fig. 13. 



Tremex columba, Drury, Exot. Ins. 2nd. Ed. ii, 78, pi. xxxviii, fig. 2, J. Say, 

 Am. Ent. ii, 74, pi. xxxii, 3, 9 . Harris, N. E. Farmer, v, 165, 211 ; Inj. Ins. 536. 



Tremex obsoleius, Say, West. Quar. Rep. ii, 1823, 73; Am. Ent. ii, 1825, 74, pi. 

 32, fig. 2, I . 



9. — Head ferruginous, body black, with six yellow bands on abdomen. %. 

 Color ferruginous, irregularly varied witli black. Length 1.08 — 1.46; with oviji. 

 1.28—1.78. Br. wings 1.72—2.36 inch. Length % 0.76—0.92. Br. wings 1.36, 

 —1.46 inch. 



9. — Antennae 14 — 15-jointed, filiform, not as long as to base of 

 thorax, yellowish, with a black band (sometimes obsolete) on from three 

 to six of the middle articles ; head and prothorax apparently granula- 

 ted, mesothorax closely punctured ; head ferruginous, with a blackish 

 line through ocelli ; prothorax, a broad stripe to scutel, scutel and 

 most of pleura ferruginous (the two last sometimes darker) ; remainder 

 of thorax and most of abdomen black ; sides of basal plates (more or 



