ICHNEUMON-FLIES OF AMERICA: 1. METOPIINAE 107 



7. Genus Triclistus 



Figure 170, a 



Triclistus Foerster, 1868, Verh. Naturh. Ver. Rheinlande, vol. 25, p. 161. Type: 

 Exochus podagricus Gravenhorst; designated by Morley, 1913. 



Front wing 3.3 to 6.7 mm. long; body punctation fine and weak; 

 face and clypeus evenly convex, the face continued dorsally between 

 antennal sockets as a triangle with an acuminate point which is con- 

 tinuous back between the antennae and to just below median ocellus 

 as a high lamella, the lamella with a deep longitudinal groove in its 

 dorsal edge, in profile the edge of the lamella arcuate; temple rather 

 long and flat, sloping rather weakly inward to give the head a cubical 

 appearance; head in profile flat or convex between hind ocellus and 

 occipital carina; occipital carina strong and complete; cheek about 

 0.6 as long as basal width of mandible; mandible rather flat, tapered 

 apically, its ventral tooth much shorter than its dorsal tooth; labrum 

 weakly projecting, usually hidden under mandibles; flagellum moder- 

 ately long, rather slender, not enlarged centrally or apically; upper 

 margin of pronotum rather heavy, convex; propleurum weakly convex; 

 scutellum weakly convex, without a lateral carina except at baso- 

 lateral corner; areolet usually present, when present small and stalked 

 above; nervulus postfurcal by 0.2 to 0.7 its length; nervellus broken 

 below the middle, usually near its lower 0.2; prepectal carina strong, 

 complete, dorsally meeting front end of subtegular ridge; sternaulus 

 absent; metapleurum smooth, polished, impunctate and hairless, or 

 with a few punctures and hairs; propodeum rather long, rather flat 

 above, declivous at the posterior transverse carina, its carinae varying 

 from all present and complete to almost entirely absent; propodeal 

 spiracle subcircular to short oval; legs exceptionally stout; second 

 trochanter of front and middle legs completely fused with its femur; 

 middle tibial spurs approximately equal in length, the front spur the 

 stouter; tarsal claws apparently simple; abdomen rather short, its 

 first tergite usually broad basally, its spiracle near its basal 0.25, 

 basally with two median longitudinal carinae; first sternite extending 

 about 0.2 the length of its tergite; epipleura rather narrow; second 

 tergite without dorsal carinae; first six tergites well exposed, the 

 seventh tergite partly retracted in male, completely retracted in 

 female, the following tergites completely retracted in both sexes; 

 female subgenital plate elongate triangular, a little convex and up- 

 curved, its apex more or less roundly notched. 



Triclistus is worldwide in distribution and contains some very 

 common species. They are small, stocky, and thick legged. The 

 head and body are usually black, with legs usually fulvous (the coxae 

 and trochanters black in some species), and wings hyaline. The head 



