ICHNEUMON-FLIES, PART 2: EPHIALTINAE 195 



This species occurs in the tropical and subtropical parts of the 

 Southeastern States. Our collections were from the undergrowth 

 of damp deciduous woods. 



12. Genus Clistopyga 



Figure 291, a 



Clistopyga Gravenhorst, 1829, Ichneumonologia europaea, vol. 3, p. 132. Type: 

 Ichneumon incitator Fabricius; designated by Westwood, 1839. 



Ichneumonoglypta Blanchard, 1941, Rev. Soc. Ent. Argentina, vol. 11, p. 9. 

 Type: Ichneumonoglypta lopez-richinii Blanchard; original designation. 



Hymenomacropyga Uchida, 1941, Ins. Matsumurana, vol. 15, p. 116. Type: 

 Hymenomacropyga latifrontalis Uchida; original designation. 



Front wing 3.4 to 11 mm. long; body long and slender; face, clyp- 

 eus, and frontal orbits partly or entirely white; clypeus narrow, con- 

 vex, somewhat flattened apically, its apical margin concave; occipital 

 carina complete, not dipped medially above; hairs on mesoscutum 

 usually moderately dense and evenly distributed, sparse in some 

 Neo tropic species; submetapleural carina complete or incomplete; 

 propodeum moderately long to very long, its median longitudinal 

 carinae weak or absent; areolet absent; nervellus broken below the 

 middle or not broken; first tergite moderately long, its median and 

 lateral longitudinal carinae present or absent; second tergite with 

 long sharp, oblique, basolateral grooves, which together with weaker 

 and more transverse apicolateral grooves bound a large median sub- 

 rhombic area; third and fourth tergites with weak or faint tubercles, 

 otherwise smooth, without a distinct apical impunctate band; female 

 subgenital plate large, shovel-shaped with a rounded apex, its apex 

 projecting a little; ovipositor compressed, tapered from base to apex, 

 its surface mat (polished in all other Pimplini except for weak wrin- 

 kling on the lower valve in Tromatobia), its basal 0.5 ± straight, and 

 apical 0.5 ± upcurved (figs. 332,a,b); ovipositor sheath about 0.3 as 

 long as front wing. 



Clistopyga is widely distributed, but the species are very scarce in 

 collections. We have seven Nearctic species, only two of them 

 represented by many specimens. 



The position of Clistopyga in the taxonomic arrangement of the 

 Ephialtinae has been unsettled. Usually it has been associated with 

 Polysphincta or placed in the Polysphinctini, because of the absence 

 of the areolet, short, tapered ovipositor, and general body form. 

 There are some features in the adult morphology, however, that are 

 not like the other Polysphinctini. The last segment of the tarsus is 

 not as enlarged as in the Polysphinctini, the tarsal claws of the 

 female are not as short and broad as usual for the Polysphinctini, 

 and the course of the prepectal carina is more like that of the Pimplini 



