Sept., 1904] ViERECK AND COCKERELL : PhILANTHID^. 133 



Cerceris platyrhina, new species. 



9 . Length about 11 mm.; allied to nasica, and like it having the enclosure of 

 metathorax strongly longitudinally ridged. It differs as follows : .smaller and rather 

 more slender ; much less hairy ; clypeal process flatter, and less emarginate seen from 

 above ; clypeus beneath process black, bordered on margin with some dark reddish, 

 the shining concave area as in nasica; supraclypeal mark small, narrow and red, 

 only occupying the lower part of the interantennal carina ; yellow lateral face-marks 

 ending abruptly no great distance above level of antennse ; front, cheeks, vertex and 

 occiput black, except a small red spot behind ocelli ; and a large red spot behind the 

 upper part of each eye ; no yellow on the red of prothorax ; metathorax black, with 

 4 minute reddish spot on each side, scarcely visible ; tegulfe yellowish-ferruginous; 

 third abdominal segment with a red median cloud. As in nasica (but not in fidelis) 

 the basal nervure almost meets transverse medial, and the first abdominal segment 

 (except its bladk base) is red. 



Habitat. — Fillmore Canon, Organ Mts., N. M., August 29 

 (Cockerell). 



Cerceris macrosticta, new species. 



$ . Length about 13^ mm.; black, yellow and red ; not conspicuously hairy ; 

 densely and coarsely punctured, the punctures especially large on the metathorax and 

 abdomen. Eyes large ; facial quadrangle much longer than broad ; face yellow up 

 to level of antennte, except a small black triangle beneath each socket, sending a nar- 

 now stripe down to the margin of the clypeus; vertex and front black, except that the 

 lateral face-marks go a short distance above the level of the antenna ; posterior orbits 

 bounded by a yellow stripe which ends abruptly not far from the top of the eye, send- 

 ing a short process backward ; cheeks behind the stripe slightly reddish, but the red 

 soon passes into black ; antenns with the first five joints ferruginous, the next dusky 

 reddish, the color beyond rapidly passing into dull black on the upper side, while the 

 joints on the under side are shining yellowish, except the apical part of the last, 

 which is black beneath, as well as above ; on the upper side, the apical margins of 

 the joints are inclined to be narrowly pallid, and are very conspicuously so on joints 

 II and 12 ; joint II is longer than lo ; 12 is much longer, being about as long as 10 

 and II together ; 13 is somewhat shorter than 12, and obliquely truncate ; mandibles 

 yellow with the apex broadly black ; anterior margin of clypeus obtusely pointed or 

 angled in the middle, and from beneath each side, occupying the lateral third of the 

 margin, there projects a reddish fringe of united hairs, concave on the upper side (a 

 similar structure occurs in C. hebes Cam., Biol. Cent. Am., Hym. II, PI. 8, fig. i,b); 

 thorax black, the upper border of prothorax extending to tubercles, but interrupted in 

 the middle line, round spot behind tubercles, oblong mark (slightly bordered with 

 red) on pleura below that, spot on each side of scutellum (the area between these 

 spots red), postscutellum, shining elongate mark on metathoracic enclosure (which is 

 otherwise completely punctate), and large elongate marks on sides of metathorax, all 

 yellow ; teguLx shining yellow ; wings strongly ferruginous, nervures ferruginous ; 

 compared with C. nasica the marginal cell is longer, and the second submarginal much 

 smaller, with a longer superior petiole; legs yellow and red, the tarsi light yellow, 

 the femora with blackish stripes above ; anterior femora, and to a less degree the 



