11 



INTRODUCTORY PAPERS ON ICHNEUMONID^. 



By John B. Bkidgman and Edward A. Fitch. 



No. II.— ICHNEUMONID^ (continued). 



The Ichneumones pneustici have been tabulated by Wesmael 

 as follows. Wesmael's fifth subfamily, the Ichneumones hetero- 

 gastri, which contains but one genus {Alomyia), and Gravenhorst's 

 genus Microleptes are also added here for convenience sake. 



A. Wings with an areolet. 



a. Spiracles of the 1st segment of the abdomen situated 



between the middle and the apex. 

 * Scutellum but slightly elevated, 

 t Middle of the apex of the metathorax not elongated 



beyond the base of the hinder coxae. 

 I Mandibles bidentate ; the upper tooth very stout, lower 

 very short. - - Gen. 1. Herpestomus, Wesm. 

 U Mandibles with two teeth of almost equal length. 

 § 2nd abdominal segment with no impression at the base. 

 X Mandibles of the female knobbed on the under border; 

 flagellum of male filiform. 



Gen. 2. Colpognathus, Wesm. 



X X Mandibles of the female with an entire border on the 



under side. 



o Post-scutellum with pits. - Gen. 3. Dicoelotus, Wesm. 



00 Post-scutellum smooth ; flagellum of male attenuated at 



the base. - - - Gen. 4. Centeterus, Wesm. 



§§ 2nd abdominal segment more or less distinctly impressed 



at the base, 

 -t- 2nd abdominal segment with two pits at the base. 



Gen. 5. Nematomicrus, Wesm. 

 -(- -I- 2nd abdominal segment with a transverse linear impres- 

 sion at the base. 

 ++ Clypeus, apical margin smooth, or entirely abruptly 

 depressed. - - Gen. 6. Phceogenes, Wesm. 



^->- +-+ Apex of clypeus widely scolloped out in the centre. 



Gen. 7. Oiorhinus, Wesm. 



•HH-+--t-+ Clypeus, just before tlie apical margin, has a small pit in 



the middle. - - Gen. b. jEthecerus, Wesm. 



