1865.] 250 



on each side; antennae half the length of the body, fuscous, thickened 

 at base, gradually attenuated to the tips which are very slender, basal 

 joint black. Thorax entirely black ; scutellum subconvex, closely punc- 

 tured, deeply excavated in front with a sharply-defined carina on each 

 side of the excavation ; metathorax rugose, the elevated lines well de- 

 fined, the central area small, saggitate, flattened, shining and somewhat 

 striated ; tegulae piceous. Wings ample, deep fusco-hyaline, rather 

 paler at tip, and with a slight violaceous reflection ; nervures and stigma 

 black ; areolet 5-angular ; the second recurrent nervure bent in the 

 middle with a short process on the outside ; the cubital nervure with a 

 rather long oblique rudimental nervure within the submarginal cell. 

 Legs shining black ; the four anterior femora at extreme tips within, 

 the anterior tibiae within and a line on the basal joint of their tarsi 

 within, whitish ; the four anterior tibiae and tarsi tinged with piceous. 

 Abdomen elongate, rather stout, deep shining black ; basal segment 

 shining, bilineated, sparsely punctured, slender at base, dilated at tip, 

 where it is tinged with obscure ferruginous; second and third segments 

 bright honey-yellow, the basal foveas of the second segment very deep, 

 transverse; beneath colored same as above. Length 10] lines; ex- 

 panse of wings 19| lines. 



One specimen. This is one of the largest and fiuest species of Ich- 

 neumon known to me ; it is easily recognized by its jet-black color, 

 with the second and third segments of the abdomen honey-yellow. 



42. Ichneumon limbifrons, Cresson. 



Ichneumon limhifrons, Cresson, Proc. Ent. Soc. Philad. iii, p. 1S2. 

 One £ specimen. 



43. Ichneumon exiguus, Cresson. 



Ichneumon exiguus, Cresson, Proc. Ent. Soc. Philad. iii, p. 182. 

 One 9 specimen. 



44. Ichneumon involutus, Cresson. 



Ichneumon involutus, Cresson, Proc. Ent. Soc. Philad. iii, p. 18;>. 

 One 9 specimen. 



Genus STILPNUS, Grav. 

 1 Stilpnus obscurus, n. sp. 



Black: legs and abdomen, except base, ferruginous ; antennas brown; wings 

 obscure hyaline. 



Male. — Black, shining; maudibles and palpi pale testaceous, the 

 former blackish at tips; face slightly pubescent; antennae three-fourths 

 the length of the body, brownish, paler and tinged with ferruginous 

 at base beneath, the joints very distinct. Thorax smooth and polished, 

 apparently impunctured; metathorax subrugose, with the elevated lines 



