88 U. S. NATIONAL MUSEUM BULLETIN 216 paht 8 



Econ. Ent., vol. 1, pp. 294-297.— Schafifner and Griswold, 1934, Misc. Pub., 

 U.S. Dep. Agr., No. 188, p. 141.— Marsh, 1937, Ecology, vol. 18, pp. 107- 

 111.— Marsh, 1937, Ann. Ent. Soc. Amer., vol. 30, pp. 40-42.— Marsh, 1938, 

 Journ. New York Ent. Soc, vol. 46, p. 27. 

 MoEPHOLoaY: Riederer, 1890, Journ. New York Micros. Soc, vol. 6, pp. 99-101 



• 



Front wing 4.5 to 9.8 mm. long; similar in structure to G. polyphemi 

 except that the body is a little more slender, tyloids extend about 7 

 segments and all of them are linear and sharp, punctures on second 

 tergite a little denser, ovipositor sheath about 0.87 as long as front 

 wing, and ovipositor tip is less specialized (see fig. 327,o). 



Male: Black. Clypeus often brown medially; mandible brown 

 medially; palpi white, their bases brown and last segment of maxillary 

 palpus more or less brownish; labial palpus sometimes entirely brown; 

 flagellum pale brown below, palest near the middle, medially with a 

 dorsal white stripe that covers about 8 segments, in dwarf specimens 

 the stripe often reduced or rarely absent; tyloids brown; tegula ful- 

 vous, usually paler basally; front coxa pale bro^^Ti to dark brown, 

 usually stramineous apically; middle coxa entu^ely stramineous to 

 largely dark brown, always with at least some stramineous or pale 

 brown; front and middle trochanters entirely yellowish white or the 

 first trochanters partly or entirely brown; front and middle legs 

 beyond the trochanters fulvous, their tarsi brown apically; hind coxa 

 brown to black, usually paler apically; hind trochanters and femur 

 fulvous, the apical 0.18± of femur fuscous; hind tibia fuscous, brown- 

 ish fulvous toward base; segment 1 of hind tarsus fuscous, its base 

 and apex usually whitish; segment 2 of hind tarsus white, sometimes 

 subbasally brown; segments 3-^ of hind tarsus white, the apex of 

 segment 4 sometimes fuscous; segment 5 of hind tarsus brown, its 

 base usually white; w^ngs hyaline; apical 0.2 ± of segment 1 of 

 abdomen and all of tergites 2-4 fulvoferruginous. 



Female: Colored like the female of G. polyphemi except that hind 

 basitarsus tends to be more completely and strongly fuscous and that 

 tergite 4 is entirely black. 



Specimens (4300^, 2919): From British Columbia (Cranbrook); 

 California (Santa Cruz Mts. in Santa Clara Co.) ; District of Columbia 

 (Washington); Florida; Illinois (Fairbury, Chicago, and Urbana); 

 Kansas (Onaga and Riley Co.); Maine (Enfield and Orono); Massa- 

 chusetts (Boston); Michigan (East Lansing and Menominee Co.); 

 Minnesota; Missouri (Columbia); New Jersey (Newark, New Bruns- 

 wick, and Paterson); New York (Big Indian Valley in Catskill Mts., 

 Elmhurst, Flatbush, Forest Park on Long Island, Jamaica, Ithaca, 

 Maspeth, New York, and Rockaway); North Dakota (Dickinson); 

 Nova Scotia (Annapolis); Ontario (Ottawa and Uplands Airport in 

 Ottawa); Pennsylvania (Ohiopyle, Philadelphia, "Philadelphia 



