90 



U. S, NATIONAL MUSEUM BULLETIN 216 



PAET 3 



This species is transcontinental in the Transition zone. It para- 

 sitizes Hyalo2:>hora spp. and is a well-known enemy of H. cecropia. 



9. Gambrus polyphemi Townes 



Figure 328,a 



Cryptus sordidus Provancher, 1886, Additions et corrections au volume ii de la 

 faune entomologique du Canada traitant des hymcnopteres, p. 67; ?. Name 

 preoccupied by Tschek, 1870. Type; ?, Ottawa, Ont. (Quebec). 



Gambrus polyphemi Townes, 1945, Mem. Amer. Ent. Soc, vol. 11, p. 809. New 

 name. 



Front wing 5.2 to 9.8 mm. long; clypeus short, rather strongly 

 convex, its apex impressed but medially less strongly and less broadly 

 impressed than it is laterally so that the clypeus appears to have 

 a very weak, broad, median projection; temples rather wide and full; 

 tyloids extending about 10 segments, the basal 5=t tyloids hnear, 

 sharp, and very narrow, the apical 5± tyloids elongate elliptic, flat or 

 weakly convex on top, the median of these 5 it the widest and about 

 0.28 as wide as the flagellar segment bearing it; mesoscutum mat, or 

 the central part of its lateral lobes subpolished, its punctures of moderate 

 size, rather shallow, separated by about their diameter; mesopleurum 

 polished with moderately strong coarse punctures in some restricted 

 areas, mostly with reticulate wrinkling that obscures or replaces the 

 punctures; second tergite weakly mat, its punctures of moderate size, 

 in male rather shallow and separated by about 1.0 their diameter, in 

 female moderately deep and separated by about 1.5 their diameter, 

 in both sexes smaller and sparser on basal and apical parts of the 

 tergite than elsewhere; ovipositor sheath about 0.47 as long as front 

 wing; ovipositor moderately compressed, its tip as in figure 328, a. 



Male: Black. Clypeus often light brown medially; mandible 

 often white or partly white ; palpi white, their last segments infuscate ; 

 flagellum light brown beneath, palest medially, medially with a dorsal 



Figure 34. — Localities for 

 Gambrus polyphemi. 



