1911] Brues — Ophiojiince with toothed Femora 23 



and bent downwards. Ovipositor not quite half the length of the abdomen. 

 The abdomen is fulvous except the base of the petiole which is pale testaceous, 

 and a narrow dorsal black line interrupted at the tips of the segments, which is 

 black. Four anterior legs yellow, lighter on the trochanters and base of the 

 middle tibiae; posterior pair fulvous, their coxae with a black dot within, 

 their trochanters testaceous; their femora black on the basal third and whitish 

 at tips; their tibiae black except for broad annulus, and their tarsi black. 

 Wings hyaline except for a faint cloud at the tip. Areolet present'^ petiolate, 

 oblique, median and submedian cells of equal length; discoidal nervure 

 broken far above the middle. 



Castle Rock, Pa., collected on August 25, 1907, by Mr. H. S. 

 Harbeck. 



Pristomerus Curtis. 



Key to the North American Species. 



1. Cubital and discoidal veins distinct to the margin of the wing 



P. euryptychiae Ashm. 



Cubital and discoidal veins obliterated just beyond the second 

 recurrent nervure, from thence to the wing margin continued as 

 scarcely perceptible streaks 2 



2. Superomedian area of metathorax broad, scarcely ionger than 



broad, third section of discoidal vein entirely obsolete 3 



Superomedian area nearly twice as long as broad; third section 



of discoidal vein nearly as long as the transverse cubitus 



P. appalachianus Viereck. 



3. Hind coxae almost entirely black, wings clear hyaline; base of 



third discoidal cell very strongly contracted at the base 



(see fig. 8) P. coloradensis sp. nov. 



Hind coxae entirely ferruginous. Wings tinged with yellow; 

 third discoidal cell less strongly contracted at the base, (see 

 fig. 2) . P. paciflcus Cress. 



Pristomerus coloradensis sp. nov. 



9 Length 8 mm.; ovipositor 5 mm. Black; head, legs and abdomen 

 in part ferruginous. Head very strongly transverse; face not narrowed 

 below; front much excavated above the antennae, shagreened and subopaque; 

 face slightly elevated medially and sparsely punctate; clypeus convex, polished, 

 its anterior border broadly rounded; mandibles 3-dentate, yellowish white, 

 with black tips; cheeks punctate, the malar space one third as long as the 

 eye-height; head behind dull, shagreened; distinctly margined. Head clothed 

 with conspicuous white pubescence; the anterior and posterior orbits, widened 

 beneath the antennae, also the clypeus and cheeks ferruginous. Antennae 

 slender, first flagellar joint four times as long as thick; second and third 

 slightly shorter, subequal and each three times as long as thick; following 



iThis character is not common to all species of the genus as stated by Ashmead (Classification 

 of Ichneumon Flies, 1900, p. 89). 



