WALSH DESCRIPTIONS OF X. AM. HYMEXOPTERA. IO9 



of all 6 legs also whitish, except that the exterior surface of the middle 

 tibia; and tarsi and all the tarsal tips and sutures are obfuscated, and that 

 in the hind tibiae the terminal l is dusky and there is an infuscation ex- 

 ternally near their base. Whigs hyaline; veins black, paler on the post- 

 costa; stigma black, 4 times as long as wide and whitish on its basal \. 

 Areolet rhomboido- triangular, the recurrent vein entering it in the middle 

 below, and with a peduncle half longer than the triangle itself. A faint, 

 brown cloud in the inner angle of the radial area. Length 9 .55 inch. 

 Front wing 9 .40 inch. Ovipos. .70 inch. 



One ? ; 6* unknown to me. Allied to persuasoria, Linn., of 

 Europe, Canada, and the Rocky Mountains, and also to albo-mac- 

 ulata, Cress. ; but is distinguished at once from both by the very 

 different markings of the thorax and abdomen, and by the meso- 

 and meta-sternum being rufous, not black. From JVorto/ii\ Cress., 

 it is at once structurally separated by the 2d recurrent vein enter- 

 ing the areolet in the middle of its posterior side, and not at the 

 apex as in lunator and atrata, and by the white orbits being en- 

 tirely interrupted opposite the antennae, and not merely emargin- 

 ate there. Atrata, Fabr., htnator, Fabr., nitida, Cress., Icevi- 

 gata, Br., 7nargi?talis, Br. (hab. unknown), and terminalis, Br. 

 (Chili), have no white markings either on the thorax or abdomen, 

 and otherwise are entirely unlike. I suspect that these 3 species 

 with white markings on the thorax and abdomen, viz. persuaso- 

 ria, albo-maculata, and humida, are all distinguished from the 

 others by having a rhomboido-triangular, not triangular, areolet ; 

 and in that case they may conveniently form a separate subgenus 

 to which the name of Pararhyssa may be given. Epirhyssa, 

 Cress., which has no areolet at all, has a coloration very similar 

 to that of Rhyssa proper. 



[Atrata, lunator (—laevigata (^), Nortofii, and nitida, all belong to 

 the genus T/ialessa, Holmgren; while persuasoria, albo-maculata, humi- 

 da, and canadensis, belong to Rhyssa proper. — Cresson.] 



Genus EPHIALTES, Grav. 

 In this genus, which has a rhomboido-triangular areolet, the 

 bulla A is small, often subobsolete, occasionally obsolete, and is 

 placed on fhe same cross-vein as B, but immediately adjoining 

 the radial area, and is separated from B, which is located near 

 the other end of its cross-vein by a considerable space. The other 

 bullae are all present and normally located, except that C and D 

 are very wide apart, and E is generally closer than usual to the an- 

 gle of the 1st recurrent vein. Unlike Rhyssa* Ephialtes does not 



