402 the canadian entomologist 



Philanthid^. 



Cerceris nigritulus, n. sp. 



Male very similar to C. nigrescens Sm., but distinct by dark 

 stigma. Markings as in C. nigrescens, rather more yellowish, but 

 in only specimen seen no spots on pronotum, nor on basal segment 

 of abdomen, and ventral marks nearly obsolete. The face broader, 

 or rather not so long as in C. nigrescens, the clypeus broadly, evenly 

 rounded below, and very strongly convex in the middle, so that 

 when seen from the side it is plainly protuberant, hair lobes not as 

 broad as in C. nigrescens, punctation and enclosure as in C. nigres- 

 cens; pygidial area not as in long as in C. nigrescens, and with 

 nearly parallel sides. A size smaller than that species. 



From Golden, N. Y, July 3 (M. C. Van Duzee). In my 

 table it runs to 24, and of the species there included it is nearest C. 

 nigrescens, but differs from all in dark stigma. 



Cerceris dakotensis, n. sp. 



Female black ; base of mandibles, spot on the clypeal process, large 

 spot each side of face near the eyes, small spot each side on prono- 

 tum, tegula?, postscutellum, broad band on second abdominal 

 segment (slightly narrowed in the middle), narrow bands on other 

 segments (broader at sides), yellow. Legs rufous, or yellowish, 

 front and middle femora dark at base; basal half of antennae 

 yellowish, or rufous beneath, tip rufous behind. Body moderately 

 coarsely sculptured, clypeal process longer than broad, narrowed 

 toward tip, not horizontal, but very much deflected; enclosure 

 rather strongly striate all over; abdomen slender, basal segment 

 only a little more than one-half as wide as the second at tip; others 

 not wider than the second; pygidial area very long, with subparallel 

 sides. Wings plainly fumose, darker at costal tip, stigma yellow^ish. 



Male similar in size to thefemale, and the abdomen also slender; 

 face below antennee all yellow, other marks as in female, small 

 lateral spots on venter yellow; and one specimen shows spots on. 

 the metanotum and first abdominal segment; large dark spot near 

 tips of hind femora, and faint dark mark near tips of hind tibiae. 

 Last joint of antennae slightly curved, third joint not as long as 

 fourth and fifth together. Clypeus slightly convex in the middle, 

 the anterior margin here black, and with three teeth; clypeal hair 



