ICHNEUMON-FLIES — GELINAE ! MESOSTENINI 319 



sides rather strongly convergent; ramellus short or absent; nervulus 

 opposite basal vein ; nervellus broken near or below the middle (rarely 

 not broken) ; axillus short and weak, near anal margin or divergent 

 from it; fii'st tergite long, slender, gradually and wealdy widened 

 apically, its spiracle far behind the middle, postpetiole weakly con- 

 vex above, basolateral tooth absent, and the ventrolateral and dor- 

 solateral carinae strong and complete; median dorsal carinae of first 

 tergite distinct, reaching about to center of postpetiole; second ter- 

 gite mat, with very fine, rather sparse punctures; tergite 7 sometimes 

 with a white spot; ovipositor sheath about 0.20 as long as front ^ving; 

 ovipositor moderately slender, somewhat compressed, its upper valve 

 with a distinct nodus, rather abruptly tapered beyond the nodus. 



Hidryta contains two Nearctic species, one of which is Holarctic, 

 and several additional species in Em'asia. 



Key to the Nearctic species of Hidryta 



1. Tergites 2 and 3 ferruginous; spiracle of tergite 2 separated from margin of 

 tergite by about 1.5 its diameter in male, by about 3.5 its diameter in female 

 (measure diameter of spiracle outside of its rim) ; tergites 6 and 7 of female 

 entirely black; ovipositor tip about 2.3 as long from nodus to apex as it is 

 deep at nodus; hind femur usually paler at apex than elsewhere, sometimes 



unicolorous 1. frater (Cresson) 



Tergites 2 and 3 largely or entirely fuscous or black; spiracle of tergite 2 sep- 

 arated from margin of tergite by about 0.3 its diameter in male, by about 

 1.0 its diameter in female; tergites 6 and 7 of female with a median white 

 area; ovipositor tip about 4.0 as long from nodus to apex as it is deep at 

 nodus; hind femur usually darker at apex than elsewhere, sometimes uni- 

 colorous 2. nigricoxus (Provancher) 



1. Hidryta frater (Cresson) 



Cryptus frater Cresson, 1864, Proc. Ent. Soc. Philadelphia, vol. 3, p. 303; 9- 

 Type: ?, Illinois (Philadelphia). 



Brachycryplus erythroceriis Thomson, 1873, Opuscula entomologica, fasc. 5, p. 

 488; 9. New synonymy. Lectotype (hereby designated): 9 (labeled 

 lectotype by Townes in 1958), Ringsjon, Sk&ne, Sweden (Lund). 



Front wing 3.2 to 5.6 mm. long; mesopleurum mostly with dense 

 reticulate wrinlding (the result of crowding of its punctures) ; first 

 tergite about 3.15 as long as wide in male, about 2.6 as long as wide in 

 female; spiracle of second tergite separated from margin of tergite by 

 about 1.5 its diameter in male, by about 3.5 its diameter in female; 

 tip of ovipositor about 2.3 as long from nodus to apex as it is deep at 

 nodus. 



Black. Mandible dusky ferruginous apically; tegula black; front 

 and middle femora varying from fulvous with some basal infuscation 

 to black with the apical part fulvous ; hind femur entirely black, black 

 with its apical part fulvous, or fulvous with some basal infuscation; 



