ICHNEUMON-FLIES — GELINAE I MESOSTENINI 333 



17. Genus Trychosis 



Figure 316,b 



Trychosis Foerster, 1868, Verb. Naturh. Ver. Rheinlande, vol. 25, p. 187. Type: 



Cryptus titillator Gravenhorst; designated by Schmiedeknecht, 1890. 

 Phaedrophadnus Cameron, 1906, Journ. Bombay Nat. Hist. Soc, vol. 17, p. 285. 



Type: Phaedrophadnus striatus Cameron; monobasic. 

 Ethaemorpha Viereck, 1913, Proc. U.S. Nat. Mus., vol. 44, p. 565. Type: 



Cryptus similis Cresson; original designation. 

 Orthocryptus Viereck, 1913, Proc. U.S. Nat. Mus., vol. 44, p. 567. Type: 



{Cryptus monticola Ashmead) =sanc?erz (Dalla Torre); original designation. 



Front wing 3.2 to 8.8 mm. long; frons unarmed; clypeiis of moderate 

 size to small, moderately to strongly convex, its apical margin sub- 

 truncate to strongly convex, without a median tooth; thorax stout, 

 short or moderately short, first abdominal segment long, and rest of 

 abdomen rather short, the first abdominal segment 0.52 to 0.59 as 

 long as thorax; mesoscutum rather short, wealdy convex, polished or 

 subpolished, its punctures coarse, moderately dense; notaulus usually 

 weak or absent, but sometimes sharp, when present usually not 

 reaching to center of mesoscutum; epomia usually strong; prepectal 

 carina reaching dorsad to middle of hind margin of pronotum; pre- 

 pectus nearly alwaj^s with a short, vertical carina opposite lower corner 

 of pronotum; propodeum in profile rather weakly convex, rather 

 strongly sloping, its basal carina complete, its apical carina complete 

 or interrupted medially, forming more or less distinct, broad sublateral 

 crests; propodeal spiracle elliptic; areolet subquadrate, its sides sub- 

 parallel or weakly convergent ; ramellus short or absent ; nervulus at or 

 distad of basal vein ; mediella moderately arched ; nervellus broken near 

 or below the middle; axillus rather short, divergent from anal margin, 

 about eqiudistant between margin and submediella; second tergite 

 polished or subpolished, its punctures fine, weak, moderately sparse 

 to very sparse; tergite 7 without a median white spot; ovipositor 

 sheath about 0.30 as long as front wing; ovipositor slender, com- 

 pressed, its tip sagittate, with a distinct nodus. 



Trychosis is Holarctic, Vvdth a few species also in the continental 

 parts of the Oriental region. We treat 20 Nearctic species, but there 

 are certainly more than these in our fauna. The genus appears to be 

 a little larger in Eurasia than in North America. 



This treatment of the Nearctic species must be considered pre- 

 liminary. The species are difhcult to distinguish because of the 

 scarcity of taxonomic characters, the variability of the characters that 

 do exist, and because a number of the "species" are probably not 

 entirely discrete in nature. Probably some of them will eventually 

 prove to be only subspecies of other Nearctic or of Eurasian forms. 

 The available material has been gone over with care and the segregates 



