1902.] NATURAL SCIENCES OF PHILADELPHIA. 53 



surface not impressed, at apex twice as broad as long, but its sides 

 narrow quite rapidly toward tlie carina; second doi*sal more dis- 

 tinctly punctured, but not strongly, subconvex beneath ; wings 

 subhyaline, a fuscous cloud in marginal cell, nervures and stigma 

 dark brown. Length 9 mm. 



cJ*. — Colored like ?, but with clypeus entirely, and mandibles 

 except tip, yellow, as are also most of fore tibiae and all tarsi ; the 

 yellow spot at base of antennae is elongate, extending down between 

 them; sculptured like the 9, except that the punctures of the 

 abdomen are stronger ; flagellum beneath and tijjs fulvous, elongate, 

 subclavate together with the two preceding joints, shorter than the 

 head and thorax, the first joint a little, though distinctly, longer 

 than second, hooked at tip, the last two joints minute, the two 

 together considerably shorter than the preceding joint, the apical 

 joint the longer of the two ; clypeus small, hexagonal, the apical 

 margin roundly emarginate. Length 7-9 mm, 



Chapada (April, September, October, December) ; Corumba 

 (April). Three females, numerous males. 



This species combines the characteristics of Ancistrocerus (upper 

 face of first segment transverse) with those of Hypancistrocerus 

 (cavity of middle segment bounded by a sharp ridge). 

 Odynerus (Hypancistrocerus) advena Sauss. 



Corumba (February, April, May); Chapada (April). Out of 

 the large series present, but one specimen is marked as having come 

 from Chapada. The differences of climate at these two districts 

 and the greater elevation of Chapada^ may have influenced the dis- 

 tribution of this species, as indicated by the present collection. 

 Odynerus (Hypancistrocerus) reflexus n- sp. 



9. — Black; with sericeous, grayish pile, especially on abdominal 

 segments 1 and 2 ; clypeus basally, spot between insertion of" 

 antennse, in each eye-emargination, scape beneath, line on each 

 side of pronotum anteriorly, spot on cheeks near top, on tegular at 

 base and apex, with a small one behind them, one on mesopleurre, 

 line on postscutellum, postero-lateral angles of middle segment, 

 four anterior femora beneath apically, a line on all tibiae, and apical 

 margin of abdominal segments 1-5, yellow, that on second segment 

 broadest; posterior margin of pronotum, and flagellum beneath, 



2 See these Proceedings, 1896, pp. 293, 294. 



