150 U. S. NATIONAL MUSEUM BULLETIN 216 



Most of the collecting dates are from the middle of June to the end 

 of August. Especially early and late seasonal dates of interest are: 

 April 12 at Daytona, Fla.; May 10 at McClellanville, S. C; "May 26 

 to June 8" at Columbia, Mo.; June 10 at Falls Church, Va. ; June 11 

 at Westerly, R. I.; September 2 at North Stonington, Conn.; Septem- 

 ber 6 at Riverhead, N. Y. ; September 11 at Takoma Park, Md.; 

 September 15 at Riverton, N. J.; September 21 at Arendtsville, Pa.; 

 and September 24 at Bolivar, W. Va. 



A male without a locality was reared from Desmia funeralis. 



We have collected the species many times in the underbrush of 

 open deciduous woods. 



This subspecies occurs in the Carolinian and Austroriparian faunas. 

 It is in the adult stage mostly from early to late summer. 



15. Genus Seticornuta 



Figure 174,a 



Megatrema Cameron, 1907, Zeitschr. Hymen. Dipt., vol. 7, p. 468; name pre- 

 occupied. Type: Megatrema albopilosa Cameron; monobasic. 



Seticornuta Morley, 1913, Fauna of British India, including Ceylon and Burma, 

 Hymenoptera, vol. 3 (1), p. 310; new synonymy. Type: (Seticornuta albi- 

 calcar Morley) = albopilosa (Cameron), new synonymy; original designation. 



Front wing 3.7 to 10 mm. long; body punctation moderately coarse 

 but shallow; combined face and clypeus roundly convex; upper margin 

 of face produced medially as a blunt triangular point between bases 

 of antennae; frons without a median process or carina; temple rather 

 short, more or less convex; head in profile sloping obliquely from hind 

 margin of hind ocelli to occipital carina; occipital carina moderately 

 strong above, weaker laterally, absent below; cheek about 0.4 as long 

 as basal width of mandible; mandible rather large, a little narrowed 

 apically, its lower tooth much smaller than upper tooth; labrum either 

 somewhat projecting or hidden beneath clypeus; flagellum of moderate 

 length, filiform or a little enlarged basally; upper part of pronotum 

 somewhat swollen, rounded off to the upper margin; propleurum 

 weakly convex; scutellum weakly convex, without lateral carina; 

 areolet rather small, sub triangular, stalked above; nervulus inter- 

 stitial to postfurcal by about 0.6 its length; nervellus broken at its 

 lower 0.15 to 0.3, or sometimes not broken; prepectal carina strong, 

 its upper end joining front end of subtegular ridge; sternaulus absent; 

 metapleurum polished, mostly impunctate; propodeum rather long, 

 abruptly declivous apicad of its apical transverse carina; propodeal 

 carination complete except that costula is lacking and areola and 

 median basal area are confluent; propodeal spiracle large, elongate; 

 legs stout; base of hind coxa extending posterior to its socket as a 

 strong shoulder; second trochanter of front and middle legs completely 

 fused with its femur; front spur of middle tibia a little longer or a 



