JOURNAL OF ENTOMOLOGY AND ZOOLOGY 23 
BB. Abdomen entirely black. 
spectrum race caudata (Cresson) Konow 
AA. Cornus not constricted at its base, or very slightly so. [Abdomen 
except first dorsal segment red; legs black, the tarsi reddish. |] 
macgillivrayt n. sp. 
MALES 
Abdomen mostly red. morrisont (Cresson) Konow 
Abdomen black. spectrum race caudatus (Cresson) Konow 
Xeris spectrum (Linneus) Costa 
(Fig. 4) 
Kirby notes that caudata is closely allied to spectrum. They 
are indeed so closely related as to be undoubtedly one species. 
A careful examination of specimens of both species fails to dis- 
close any very satisfactory characters to separate them even as 
races. [Konow does this as follows: 
Legs uniformly reddish yellow, in the ¢ the posterior legs black 
at base; ¢ with black temples; ovipositor longer than the 
body. caudata (Cresson) Konow 
Tibizw white at base, each temple with a yellowish white spot; 4 
with posterior legs mostly black; ovipositor as long as the 
body. spectrum (Linneus) Costa 
Xeris spectrum race caudata (Cresson) Konow 
(Figs. 11 and 28) 
1865b Urocerus caudatus Cresson, 9. Cat. Hym. in coll. Am. ent. soc. 
from Col. Terr. < Proe. Ent. soe. Phila.; v. 4: p. 247. 
1869 Urocerus caudatus Norton, 6 2. Cat. descr. Tenthred. and Uroe. 
N. A. < Trans. Amer. ent. soc.; v. 2: p. 363. 
1874 Sirexr melancholicus Westwood, ¢. Thes. ent. oxon.; p. 116; pl. 
21, f. 8. 
Distribution: Inhabits the Hudsonian and Canadian life 
zones, where it is a common insect, having been found from 
Alaska, Keewatin, and Nova Scotia south along the Pacific 
Coast to northern California, and in the Rocky Mountains to 
Colorado, where it occurs at high altitudes. In the east it has 
been taken in the White Mountains, and may be expected in 
the Adirondacks. 
