130 [August 



and densely ciliated on the anterior edge, lobes acute ; clypeus four- 

 toothed at tip ; wings dusky blackish on the posterior margin ; wino-- 

 scale and double line on the scutel yellow ; tergum yellow ; incisures 

 reddish-brown. 



" Length of the body nine-tenths of an inch. 



" The specimen is a female, remarkable by the prominence of the 

 nasal portion of the face, a character which was also pointed out by 

 Ijatreille, in a species which he called Cerceris aurita, which insect he 

 observed to nourish its young, with insects of the Linnean genus 

 CurcuUoy 



27. Cerceris bidentata, Say. 



Cerceris bidentata, Say, West. Quar. Eep. ii, p. 80, 9- 



" Lateral lobes of the clypeus each elevated into a prominent spine : 

 anterior margin of the superior wings dusky. 



" Inhabits Arkansa. 



" Body pale yellowish; head behind the eyes and above, and base of 

 the antennae, rufous; antennae black at tip; front concave, lateral 

 lobes of the clypeus each with a conic prominence perpendicular to the 

 surface ; mandibles black at tip ; thorax rufous on the principal seg- 

 ment; superior A'ings blackish on the anterior margin, the costal ner- 

 vure tinged with yellowish in the middle : tergum incisures reddish- 

 brown ; segments each with a transverse groove on the middle. 



" Length less than three-fifths of an inch. 



" In general color, very much resembles the preceding species, from 

 which it may be distinguished by its much smaller size, and by the 

 two remarkable spines or tubercles situated on the lateral lobes of the 

 clypeus. The specimen is also a female." 



28. Cerceris verticalis. Smith. 



Cerceris verticalis, Smith, Brit. Mus. Cat. Hym. iv, p. 466. 

 " Female. Length 6 lines. — Black, thickly punctured ; the head 

 ferruginous behind the eyes; the scape and second joint of the flagel- 

 lum ferruginous ; the face below the antennae yellow ; the margins of 

 the clypeus black ; the mandibles ferruginous, their extreme base yel- 

 low. Thorax : the collar yellow, interrupted in the middle by a ferru- 

 ginous spot, the post-scutellum and a spot on the tegulae yellow ; a 

 large ferruginous blotch on each side of the metathorax ; the wings 

 smoky-hyaline ; the legs ferruginous. x\bdouieu : the basal segment 

 ferruginous, with a minute yellow spot on each side; the second seg- 

 ment yellow, with the basal margin and a produced quadrate spot in 

 the middle ferruginous; the margins of the fo]lowin<>' segments with 



