no. 2358. NEW SPECIES OF FOSSIL INSECTS— COCKERELL. 37 



Mountains, but apparently quite distinct by the long slender thoracic 

 process. At first I wondered whether this could be illusory, and the 

 apparent process be a leg elevated behind the head; but closer in- 

 spection negatives this, and moreover, as in Scudder's insect, both 

 legs can be seen in the usual position. 

 Holotype.-- Cat. No. 66930, U.S.N.M. 



HYMENOPTERA. 

 Family ICHNEUMONIDAE. 



TILGIDOPSIS, new genus. 



Similar in general appearance and venation to the oriental genus 

 TUgida, but apparently falling in or closely related to the Paniscini. 

 Stigma lanceolate, not 



much broadened ; radius 

 sharply angled, V-like at 

 first intercubitus ; no are- 

 olet; basal nervure nearly 

 meeting nervulus. Body 

 rather slender, the abdo- 

 men slender basally, 



, ni ii i riG. Si— TlLGIDOrsIS n.\ESITANS. WlNG. 



broadly banded; terebra 



exserted a short distance. The terebra is not well preserved, and 

 I am not sure that it is correctly described, but it seems to be clearly 

 present and exserted. In the Paniscini, the genera Ophdtoideus Ash- 

 mead and Parca Morley lack the areolet, but our insect can hardly 

 be associated with either. It is probably significant thslt TUgida 

 Cameron, of which the female is unknown, is of uncertain position 

 owing to its lack of distinctive features. It may perhaps be an 

 ancient type, really related to our fossil. 

 Type. — Tilgidopsis haesitans, new species. 



TILGIDOPSIS HAESITANS, new species. 



Female. — Length about 8 mm. ; anterior wings slightly over 5 mm., 

 hyaline, with the apical half faintly dusky; stigma and veins dark; 

 head and thorax black or dark brown; abdomen slender, with 

 alternating broad light and dark bands; ovipositor apparently ex- 

 serted about 1 mm. beyond abdomen. Marginal cell 2560 n long; 

 first brachial cell 1280 fx long. 



Eocene: White River, Colorado (U. S. G. S. 676). Among the 

 Eocene species, this resembles Ichneumon petrinus Scudder in many 

 respects, but Scudder's insect is too imperfectly preserved to bo 

 placed generically. 



Holotype.— Cat. No. 66931, U.S.N.M. 



