ICHNEUMON-FLIES, PART 2 1 EPHIALTINAE 241 



emerged. This is spindle shaped, dense, light brown, square in cross 

 section with a longitudinal rib at each of the four corners, and has 

 the usual hole at the hind end. The cocoon is essentially like that of 

 Acrodactyla, indicating that Eruga is probably related to that genus. 



Type: 9, reared June 27, 1945, from parasitized spider collected 

 June 13, 1945, Bcthesda, Md., J. M. Davis (Washington, USNM 

 63702). 



Paratypes: 29, Takoma Park, Md., July 19 and 24, 1943, H. and 

 M. Townes (Townes). <?, Greenville, S. C, Oct. 6, 1941, H. and M. 

 Townes (Townes). 



6. Genus Piogaster 



Figure 295,a 



Piogaster Perkins, 1959, Entomologist, vol. 91, p. 263. Type: Piogaster rugosa 

 Perkins; original designation. 



Front wing 3.4 to 5.2 mm. long; eye bare; clypeus strongly swollen, 

 sharply separated from face; epomia absent; mesoscutum with close 

 punctures, dense evenry distributed hairs, and usually strongly mat; 

 notaulus absent; prepectal carina complete, its upper end approaching 

 but not reaching front edge of mesopleurum ; pleural carina complete, 

 but weak; legs rather short; areolet absent; intercubitus about 0.4 

 as long as second abscissa of cubitus; nervulus postf ureal by about 

 0.5 its length; discoidella present or absent; nervellus strongly in- 

 clivous; first tergite broad and short; second through fourth tergites 

 strongly mat, evenly covered with dense hairs, without grooves or 

 swellings; ovipositor sheath 2.5 as long as apical depth of abdomen; 

 ovipositor tapered from base toward apex, with a faint post-median 

 enlargement, its point not as slender as in most Polysphinctini. 



This is a Holarctic genus, with three species in Europe and one in 

 California. 



1. Piogaster maculata, new species 



Figure 323,k 



Male: Unknown. 



Female type: Front wing 3.4 mm. long; entire head and body very 

 strongly mat, evenly covered with rather short dense hairs; propodeum 

 short, strongly convex, its lateral longitudinal carina present apically, 

 its median longitudinal carinae lacking; hind femur 3.7 as long as 

 deep; first tergite 0.67 as long as wide, its dorsal carinae present only 

 near its basal corners, otherwise smooth above; second and following 

 tergites smooth, without grooves or swellings. 



Head blackish brown, reddish brown on cheek and front orbit, the 

 vertex with a large elongate triangular yellowish white spot next to 

 eye; thorax blackish brown, the mesopleurum, pronotum, lateral part 



