48 U. S. NATIONAL MUSEUM BULLETIN 216 



nition of subtilis include the rather finely and inconspicuously hairy 

 sheath, the unusually coarsely punctate abdomen, the unusually small 

 abdominal sternites, the blackish labial palpus, and the yellowish 

 mark on the base of the stigma. 



Type: 9, Leevining, Calif., June 24, 1948, H., M., G., and D. Townes 

 (Washington, USNM 63745). 



Para types: 9, same data as type (Townes). 9, Boca, Nevada Co., 

 Calif., June 28, 1954, R. M. Bohart (Davis). 9, Holbrook, Douglas 

 Co., Nev., May 25, 1952, E. I. Schlinger (Davis). 9, Eagle Ridge, 

 Klamath Lake, Oreg., May 15, 1924, C. L. Fox (San Francisco). 



Host: Unknown. 



5. Scambus vesicarius (Ratzeburg) 



Male: Front wing 3.25 to 4.50 mm. long; antenna with 19 to 21 

 segments; cheek very short, about 0.15 times breadth of mandible at 

 base; temple, as seen from above, strongly rounded and about 0.66 

 times as long as eye; thorax moderately stout; propodeum with rather 

 strong, dorsomedial carinae extending from base to apical 0.25; front 

 femur rather slender, very slightly flattened but without an excision 

 beneath; front tibia very slightly bent; abdomen slender; tergite 1 

 about 1.5 times as long as wide, more or less rugulose, without distinct 

 punctures; tergite 2 granular to rugulose, and indistinctly punctate, 

 except at apex; remainder of tergites with rather similar but pro- 

 gressively weaker sculpture. 



Female: Front wing 2.75 to 6.25 mm. long; antenna 20 to 22 seg- 

 mented; cheek rather short, about 0.33 times the breadth of mandible 

 at base; temple, as seen from above, rather strongly rounded and 

 about 0.60 as long as eye; thorax and propodeum moderately stout; 

 dorsomedial carinae of propodeum distinct and extending a little 

 beyond middle; hind femur 4.85 times as long as deep; abdomen with 

 tergite 1 moderately elevated and about as long as wide, with sides, 

 and central area at apex, finely, irregularly rugulose and without 

 distinct punctures; remaining tergites with numerous, rather un- 

 evenly distributed, moderately large, shallow or indistinct punctures 

 that are often more or less confused with other sculpture; sheath a 

 little longer than abdomen, with rather coarse, conspicuous hairs. 



There are two subspecies, differentiated mainly by leg color. The 

 nominate subspecies is widely distributed in the Palearctic region 

 but in North America is known only from the Alaskan peninsula. 

 There it replaces the subspecies euurae, which is otherwise transcon- 

 tinentally distributed, chiefly in the Canadian and Hudsonian zones. 



Hind tibia of male indistinctly brownish to fuscous subbasally and at apex, with 

 intermediate region somewhat paler but not distinctly annulate; hind tibia in 

 female uniformly dull reddish or pale brownish, with only traces of fuscous 

 subbasal and apical annuli .... 5a. vesicarius vesicarius (Ratzeburg) 



