516 



U. S. NATIONAL MUSEUM BULLETIN 216 



PART 3 



I L ^ r * J r^ .'""^ \ 



3>^ — 



Figures 299-302. — Localities: 299 (left), Helcostizus annulicornis; 300 (center, left), 

 H. tibialis; 301 (center, right), H. subrectus; 302 (right), H. oxyura. 



(Ottawa), cf, Ithaca, N.Y., F. H. Chittenden (Washington). 9, 

 Stillwater, Okla., Apr. 16, 1936, M. Maxwell (Ottawa). 9, reared 

 (host probably Elaphidion parallelum), Barcroft, Va., Mar. 9, 1935, 

 J. C. Bridwell (Washington). 



This species occurs in the Transition and Carolinian faunas. 



2. Helcostizus tibialis, new species 



Front wing of male 4.7 mm. long, of female 5.5 to 6.0 mm. long; 

 flagellum of single male specimen missing, so tyloids cannot be de- 

 scribed; body slender; propodeum about 1.1 as long as wide, in profile 

 evenly convex, its apical part a little less abruptly sloping than in other 

 species ; ninth tergite of female, as seen from above, about 1 .4 as long 

 as wide; ovipositor about 0.59 as long as front wing. 



Male: Black. Face, cheek, lower part of temple, mouth parts, 

 front half of scape and pedicel, propleurum except for front end, 

 broad stripe on lower margin of pronotum, small triangle in hind corner 

 of pronotum, small stripe on subtegular ridge, mesosternum and 

 adjacent part of mesopleurum, tegula, front and middle coxae, and 

 trochanters, white, the upper side of first hind trochanter fuscous; 

 front femur and tibia fulvous; front tarsus brown, darkest apically; 

 hind coxa fulvous, its extreme apex whitish; hind femur fulvous, its 

 apical fourth infuscate except that extreme apex is whitish; hind tibia 

 whitish, with a subbasal infuscate band and its apical third fuscous; 

 hind tarsus fuscous, the basal 0.25 of its basitarsus whitish ; middle legs 

 beyond trochanters repeating markings of hind legs but in paler 

 shades and with less contrast. 



Female: Black. Labrum, band on flagellum covering about 2.5 

 segments but incomplete below, extreme hind corner of pronotum, 



