ABT. 15«. REVISION OF SUBFAMILY PLATYGASTERINAE — FOUTS. 41 



and one-half times as long as wide, rounded anteriorly, truncated 

 posteriorly; pronotum shagreened above and medially on the side; 

 on the anterior, posterior, and lower parts of the lateral plate it is 

 polished, unsculptured; pronotum above traversed longitudinally by 

 two sharp curved ridges which lie directly behind the anterior ends 

 of the notauli; notauli complete, meeting posteriorly in a rather 

 sharp point which projects nearly over the scutellar fovea; median 

 lobe of mesonotum uniformly shagreened; lateral lobes shagreened 

 on the inner sides; soutellum circular seen from above, margined 

 laterally, as strongly shagreened as the mesonotum, not hairy; meta- 

 plourae, propodeum laterall}^, first tergite laterally, and second ter- 

 gite at the bases of the foveae covered with semierect whitish hairs; 

 abdomen about twice as long as the head and thorax united, widest 

 at the apex of the second tergite where it is slightly narrower than 

 the thorax; first tergite twice as wide as long, the dorso-lateral ridges 

 sharp but not high, the central area a trifle wider than the lateral 

 areas, quadrate, with a few inconspicuous carinae basally; second 

 tergite about one and three-fourths times as long as wide at the apex, 

 the sides parallel on apical half, converging slightly anteriorly; this 

 segment and the first united as long as the thorax; basal foveae well 

 marked, with a few faint striae which do not extend posterior their 

 apices ; area between the foveae on each side with a few striae which 

 reach to basal third of the segment; third tergite one and one-half 

 times as wide basally as apically, slightly wider apioally than long, 

 the sides straight, oblique; fourth tergite about twice as long as wide, 

 a little wider basally than apically, one and one-half times as long as 

 the third; fifth tergite about three times as long as wide, the sides 

 parallel, slightly longer than the fourth; sixth triangular, as long as 

 the fourth, twice as long as wide, sharpl}- pointed distally; wings 

 extending a little beyond the apex of the fourth segment, subhya- 

 line, pubescent. Black, legs rufous; terminal tarsal joints and 

 flagellum of antenna pioeous; scape dark reddish brown; pedicel 

 touched with yellow distally. 



Type locality. — Ottawa, Canada. 



Type.—Qs.t. No. 24600, U.vS.N.M. 



Redescribed from the type specimen in the United States National 

 Museum. This is -one of the forms which Ashmead considered 

 belonged in Polymecus Foerster. Had he read Foerster more care- 

 fully he would have seen that no mention was made of any unarmed 

 scutellum in the group. Polymecus Foerster always has the scutel- 

 lum armed and differs in no way from Synopeas Foerster (except in 

 the elongation of the abdomen in the female sex). Synopeas and 

 Polymecus must both be considered synoyms of Leptacis Foerster as 

 will be indicated in my discussion of the genus Leptacis on a subse- 

 quent page. 



