WALSH DESCRIPTIONS OF N. AM. HYMENOPTERA. 1 47 



(j* where the carination is subobsolete. Legs black ; more or less of the 

 tips and of the superior surface of the 4 front femora jellowish-rufous or 

 rufous; all 6 tibiae and tarsi bright gamboge yellow, the tarsal tips not 

 obfuscated. Wings subhjaline, more or less strongly tinged with fuscous, 

 especially at tip. Veins and stigma black, the stigma occasionally red- 

 dish-brown. Radial area elongate. Areolet rhomboidal, occasionally 

 with a short petiole, the side that faces the apex of the wing |-i longer 

 than the other 3 (which are equal), and more or less convex externally. 

 Angle of the ist recurrent vein about 135°; the 2d recurrent vein biangu- 

 lated, but with the salient angle more or less subobsolete. Length c? .47 

 -54. ? •43--53 inch. Front wing ^ .39-.46, $ .38-.43 inch. 



Eighteen 'S , four 9, all taken in July, 1865, on umbelliferous 

 flowers, except a single ? . When handled alive, this species gives 

 out the same peculiar smell as do most, if not all, species of Bom- 

 bus. Very near niger. Cress., but differs in the wings not being 

 " uniform dark fuliginous," and in the hind tibiae and tarsi being 

 always yellow (not black). Mr. Cresson's other ten species are 

 quite dissimilar. 



Exetastes fascipennis, Cress. — $. — The wing-band is "beyond the 

 middle," as is correctly stated in Mr. Cresson's diagnosis, not "before the 

 middle," as is stated in his description, probably through some clerical or 

 typographical error. There are the same subobsolete carinje on the meta- 

 thorax as in suaveolens \ the areolet is shaped precisely as in that species, 

 and the 4 typical bulliE are all present. Length ? .45 (.37-.50 Cress.), 

 inch. Front wing 9 .34 inch. Ovipos. .07 inch. 



One 9 ; % unknown to me. In having only the ist joint of the- 

 scape rufous, and in many other characters, this species singularly 

 recalls E. castaneus, Brulle (S. A.), but differs in the thorax being^ 

 punctate, not " granulated or rugose." 



LEPTOBATUS, Gravenhorst. 



This genus seems to differ from Exetastes only in there being" 

 no stump of a vein on the ist recurrent vein, in the mouth being 

 scarcely rostriform, in the longer ovipositor, and in the prolonga- 

 tion of the 6th ventral beyond the tip of the abdomen. The cha- 

 racter assigned to the European species of the ist abdominal joint 

 being a little contracted at tip, I do not find in mine. As the only 

 strongly distinctive characters between these two genera are pe- 

 culiar to the $ , I suspect, from the pattern of coloration being so 

 similar on the thorax, that Mr. Cresson's Ex. flavitarsis and Ex. 

 consimilis, the S S only of which are known to me, are congeneric 

 with my Leptobatus. The bullae are 3, B, CD, and E ; B normally 



