NO, 2284. NEW NORTH AMERICAN ICHNEUMON-FLIES— CVSHMAN. 541 



more or less reddish, tibia black and white, the black arranged in an 

 apical and a subbasal band connected below by a dark stripe, tarsi 

 black with the joints white at base. 



Male. — Length, 6 mm. ; antennae, 6 mm. Differs from the female 

 in the usual manner for members of the genus in the more slender 

 form, relatively longer antennae, shorter malar space, ventrally pale 

 antennae, paler legs especially the front and middle pairs, deeper 

 notauli, stronger propodeal carinae with narrower areas and the less 

 precipitous posterior face of the propodeum. Otherwise in color and 

 structure much like the female. 



Host. — Polychi'osis viteana demons. 



Type-locality. — North East, Penns^dvania. 



Type.~C2Lt., No. 21,638, U.S.N.M. 



Described from 11 specimens of each sex selected from a large 

 series reared by the author as parasites of the larva of the grape- 

 berry moth, under Quaintance Nos. 10,996, 11,015, 14,441, 14,442, and 

 14,470. 



The paratypes are selected and arranged to show the great varia- 

 tion in color. Paratype d is like the type. Paratypes c to a show 

 the increase in the amount of red, a having the three lobes of the 

 mososcutum red and the scutellum slightly Avhitish at apex; while e 

 to k show the progressive encroachment of black until, in ^•, the red 

 is practically eliminated, traces of this color being confined to the 

 scutellum and the lower posterior angle of the mesopleurum. In I 

 the white of the pronotum is confined to a small spot in front of the 

 tegula. Paratjq^e m is like the allotype except that the scutellum is 

 somewhat paler while in I it is distinctly whitish laterally. Paratypes 

 n — s show the increase in black, s being entirely black. Paratype m, 

 although having more black on the pleura, has the scutellum paler 

 than in the allotype, while the succeeding specimens have the decrease 

 in red of the scutellum paralleling that of the pleura. Paratypes t 

 and w, although having much more black on the pleura, have the red 

 much paler, and in u the scutellum is black with the apex white. 



The black color of the pleura encroaches on the red both from above 

 and from below", the red disappearing last just at the base of the mid- 

 dle coxae. 



Variations in size and structure are slight, the most notable being 

 in the degree of convexity of the temples. 



Subfamily Tryphoninae. 



Genus MESOLEIUS Holmgren. 



MESOLEIUS BALTEATUS, new species. 



in Davis's key to North American members of the genus^ runs to 

 idahoensu- Davis^ differing from Davis's description as follows: First 



1 Trans. Amer. Ent. Soc, vol. 24, 1897, p. 295. 



