NORTH AMERICAN HYMENOPTERA. 125 



Noinatla aiiiericana Kliy., Faun. Bor.-Am. iv, 269, 1837; N. hisignata var. 

 Say, Bust. Jouru. i, 402, 1837; N. valida Sm., Brit. Mus. Cat. Hym. ii, 246, 

 1854; N. mimtl at a Sm., ibid. 248, % (nee 9); ^- articnlata Cr. (nee Sm.), 

 Proc. Ent. Soc. Phil, ii, 297, 1863; N. incerta Cr., ibid. 309. 



Osniia bncepliala Cr., Proc. Ent. Soc. Phil, iii, 17, 9 ; 0. latitarsis Cr., ibid 

 20, %. 



Osniia albiveutris Cr., Proc. Ent. Soc. Phil, iii, 31, "J, 9 ; 0. rmtica Cr., 

 ibid. 37, % . 



Megacliile 6-<lentata %. — Black, robust, with abundant pubescence, 

 which is ochraceous above and white beneath, face densely pubescent, that on 

 clypeus white, on face above ochraceous ; mandibles and antennae black, vertex 

 shining, with median sized, close, shallow punctures, mesonotum opaque, more 

 densely and finely punctured, the pubescence rather short and thin, but not with 

 any admixture of black. Wings hyaline, apical margin faintly dusky, nervures 

 dark, tegulse testaceous. Legs dull ferruginous, anterior femora and tibige ferru- 

 ginous within, coxal spines nearly concealed by pubescence. Abdomen shining, 

 rather coarsely punctured, especially towards apex, first segment widely excavated 

 at base, disc in middle quite short, the segment with long ochraceous pubescence : 

 remaining segments with short, thin, ochraceous pubescence, except on apical 

 margins of segments 2-4 and basal margins of 4-6, where it is dense and de- 

 pressed ; sixth segment with the usual elevation, which, however, is unusually 

 prominent, narrow and deeply and roundly notched, so that it appears like two 

 large spines and exposes to view two prominent spines on each side of the apical 

 margin, beyond these on the seventh segment appears a conspicuous elevation, 

 which is itself bidentate at apex. Length 11 mm. 



Hab. — Illinois ; one male. 



Ulegacliile floridana % . — Black, robust, vertex and abdomen somewhat 

 shining, pubescence beneath rather long and white, on the face dense and with a 

 tinge of yellowish, on the vertex, mesonotum and discs of abdominal segments, 

 except first and sixth, it is black ; mandibles large, black, flagellum dull testace- 

 ous beneath, mesonotum more closely punctured than vertex or abdomen. Wings 

 subhyaline, with a purplish reflection, apical margin dusky, nervures dark, tegulfe 

 black ; coxal spines conspicuous, flattened. Legs black, anterior femora and tibife 

 within, and apex of tibiae, yellow ; tarsi white and with a dense brush of white 

 pubescence posteriorly, the joints strongly flattened, but not otherwise greatly 

 modified, first joint widens to apex, second about as wide as apex of first, from 

 which the tarsus narrows to the claw joint, middle and hind tarsi pale yellowish 

 anteriorly, the middle tarsi strongly ciliate posteriorly, all the claws honey-yellow 

 with dark tips; basal segment of abdomen strongly excavated, the disc not un- 

 usually narrow and clothed with long pale pubescence, apical margins of segments 

 2-5 with fasciae of pale pubescence much wider on sides ; elevation of sixth seg- 

 ment prominent, not deeply notched in the single specimen before me ; the ex- 

 treme edges of this segment presents on each side a small inconspicuous spine, 

 and a rounded carinate elevation further inward. Length 12 mm. 



Hab. — Florida ; one male. 



TRANS. AM. ENT. SOC. XXII. MAY. 1895. 



