608 TERTIARY INSECTS OF NORTH AMERICA. 



Length of body, 4.0""" ; of (broken) antennae, 3 mm ; of ovipositor (base 

 wanting), 2 5"' m . 



Green River, Wyoming 1 . One specimen, No. 138 (Dr. A. S. Packard). 



Family ICHNEUMONID^: Leach. 

 ICHNEUMON Linne". 



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ICHNEUMON PKTRINUS. 



PI. 5, Figs. 14, 15. 

 Ichneumon petrinus Scmld., Bull. U. S. Geol. Geogr. Siirv. Terr., Ill, 743 (1877). 



A fragmentary specimen, preserved on a dorsal aspect; parts of the 

 front wings, the thorax, and basal half of the abdomen are preserved. The 

 body is blackish and the wing-veins testaceous; the wing, excepting the 

 fusco-testaceous stigma, is hyaline, covered sparsely with very delicate and 

 moderately long hairs ; the stigma is long and slender, the heaver main 

 portion about two and a half times longer than broad, the slender basal 

 extension as long again. Unfortunately, the wing is preserved only as far 

 as, but not including, the areola, so that many characteristic parts are lack- 

 ing; the second median and first subcostal cells are united, the vein separat- 

 ing them being present only below, where it is directed parallel to the 

 principal longitudinal veins ; the vein from which it springs is bent at an 

 angle of about 70, so that the part representing the first subcostal cell 

 tapers rather rapidly in its apical half, while its basal half (if the cross-vein 

 were continued) would be of the same size and shape as the second median 

 cell, or a parallelogram nearly twice as long as broad; the vein separating 

 the first and second median cells is continued in a nearly direct line below; 

 the third median cell is long and rather slender, with somewhat produced 

 angles basallv. The first segment of the depressed abdomen is fully half 

 as long again as broad, increases a little and regularly in size toward the 

 extremity, at its base is about half as broad as the extremity of the thorax, 

 and <it its tip less than half as broad as the broadest part of the thorax; the 

 second segment is considerably larger, and also enlarges apically, but its 

 length is indeterminate. 



Length of thorax, 2. (>"""; breadth of same, 1.5"""; length of wing to 

 tip of stigma, 4.2") '; breadth of base of abdomen, . r >""". 



Chagrin Valley, White River, Colorado. One specimen (W. Denton). 



