JOURNAL OF ENTOMOLOGY AND ZOOLOGY 19 
gigas 
g 
Cornus linear, very slightly wid- 
ened before the apex; eighth dor- 
sal segment entirely yellow; ninth 
dorsal segment yellow laterally at 
apex. 
é 
Scape usually black; flagellum 
yellow; seventh dorsal segment 
yellow. 
flavicornis 
g 
Cornus more distinctly widened 
before the apex; eighth dorsal seg- 
ment yellow only at base; ninth 
dorsal segment entirely black. 
é 
Seape black; antenne from the 
seventh segment to apex often but 
not always dusky or black; sey- 
enth dorsal segment black. 
Distribution: From Siberia and Alaska, Keewatin and Lab- 
rador south along the Pacific Coast to Oregon, along the Rocky 
Mountains to Arizona and New Mexico (at high altitudes) and 
even Mexico, south in the east to northern New York, New 
Hampshire and Massachusetts. 
The species is characteristic of the Hudsonian and Canadian 
life zones. It seems to be common in coniferous forests of the 
north. It is entirely absent so far as known from California, 
and in the states of Colorado, Utah, Arizona and New Mexico 
is confined as noted by Mr. Rohwer, to the high mountains, 
7500 feet and upward. A single record from Nebraska is rather 
puzzling, and perhaps an error. Farther east it extends south 
searcely below the Canadian boundary, having been taken at 
high altitudes in the White Mountains and a single specimen 
many years ago at Ithaca, N. Y. 
Urocerus albicornis (Fabricius) Harris 
(Fig. 32) 
1781 Sirex albicornis Fabricius, 2. Spee. insee.; v. 1: p. 419. 
<1841 Urocerus abdominalis Harris, 6. Report ins. Mass. inj. veg.; p. 
419. 
1882 Swrex stephensi Kirby, 9. List. Hym. Brit. mus.; v. 1: p. 375. 
The male is indistinguishable, so far as yet known, from the 
male of S. flavicornis. 
Distribution: From British Columbia, northern Ontario, 
Nova Scotia and Newfoundland south to Pennsylvania, Wash- 
ington and northern Idaho. 
