ICHNEUMON-FLIES OF AMERICA: 1. METOPIINAE 169 



Figure 103. — Locality for 

 Stethoncus arcticus. 



moderately convex, without lateral carina; areolet absent; intercubitus 

 separated from second recurrent by about 1.1 its length; nervulus 

 postfurcal by about 0.55 its length; nervellus strongly inclivous, 

 weakly broken near its lower 0.2; prepectal carina complete, its upper 

 end joining front end of subtegular ridge; sternaulus a weak impression 

 that extends about half the length of mesopleurum; metapleurum 

 polished, with a band of hairs along its upper margin, elsewhere bare; 

 propodeum convex, more strongly declivous behind apical transverse 

 carina, with carinae as in figure 175,b, its median longitudinal carinae 

 approaching closely or fused at base of areola; propodeal spiracle 

 rather small, subcircular; legs moderately stout; hind coxa a little 

 produced posterior to its socket to make a weak, rounded shoulder 

 behind; second trochanter of front and middle legs incompletely fused 

 with its femur; front spur of middle tibia about twice as long as hind 

 spur; tarsal claws apparently simple; abdomen a little narrowed 

 basally; first tergite moderately wide basally, its lateral longitudinal 

 carina strong to the apex, its median longitudinal carinae strong on 

 basal half, absent from apical half; second tergite without dorsal 

 carinae; epipleura of first two tergites vestigial, of third and following 

 tergites wide; female subgenital plate weakly sclerotized, unspecialized. 



Genotype : Synosis clepsydra, new species. 



The generic name is from the Greek "synosis" (a squeezing together), 

 referring to the convergence of the median longitudinal carinae of the 

 propodeum. 



There is a single known species, which is described below. 



Synosis clepsydra, new species 



Figure 175,b 



Front wing 3.3 to 5.5 mm. long; punctures of mesopleurum fine, 

 their interspaces about 2.0 times their diameter; punctures of second 

 abdominal tergite moderately fine, their interspaces about 1.7 times 

 their diameter. 



