14 



Dec, 1917 Bulletin of the Brooklyn Entomological Society 99 



12. Anterior margin of the clypeus deeply, arcuately emarginate; scutum 



finely rugulose and with a few scattered punctures rileyi Fox. 



Anterior margin of the clypeus subtruncate with a median tooth; 

 scutum rather coarsely punctato-rugulose errans Rohwer. 



13. Anterior margin of the clypeus deeply biemarginate or tridentate ; 



scutum with distinct rather large punctures foxii Rohwer. 



Anterior margin of the clypeus truncate or somewhat produced ; scutum 

 rugulose or punctato-rugulose ^4- 



Basal dorsal middle of propodeum coarsely rugo-reticulate, separated 

 from the rest of the propodeum by a U-shaped area which is finely 

 aciculate; anterior margin of the clypeus produced into an angle; 

 scutum with fine, curved wrinkles angularis Fox. 



Propodeum without a U-shaped area; clypeus different • IS- 



15. Anterior margin of clypeus subtruncate, without a median tooth or 

 lateral angles ; scutum punctato-rugulose; third antennal joint fully 

 one third longer than fourth concolor Say (Fox). 



Anterior margin of clypeus truncate, with a median tooth and with 

 lateral angles of truncation prominent, so there is an indication of 

 being tridentats; scutum punctato-rugose. third antennal joint 

 about one fourth longer than fourth virginiana Rohwer. 



Pemphredon errans new species.— Pemphredon rileyi Fox, Trans. Amer. 

 Ent. Soc, Vol. 19, 1892, p. 310. Male, not female. 



The male which Fox associated with the female he described as rileyi 

 is the male of one of the females which he wrongly placed under this spe- 

 cies. Of the specimens originally placed under rileyi by Fox only one of 

 them, the holotype female, really belongs there. The others are a new 

 species and are described herewith. The description of the female given 

 by Fox was, at least for the greater part, taken from the holotype. 



Female.— Length 7 mm. Clypeus flat, shining, with large, rather close 

 punctures, the anterior margin subtruncate with a small median tooth and 

 rather prominent lateral angles ; distance between the eyes at the clypeus 

 somewhat greater than the length of the eye; front punctato-aciculate ; 

 posterior orbits and vertex shining, sparsely punctured; seen from above 

 the anterior width of the head is not twice as great as the cephalo-caudad 

 length; head not markedly narrowing behind eyes; ocellocular line one 

 half longer than the postocellar line; third antennal joint one third longer 

 than the fourth; scutum with a median depression anteriorly where the 

 curved striato-punctations meet; scutellum sparsely punctured; dorsal 

 basal area of propodeum flat, with uniform longitudinal striae which 

 become weaker posteriorly; sides and posterior face (except the median 

 channel) aciculato-punctate ; petiole not strongly sulcate laterally, much 

 shorter than the hind basitarsis. Black; wings hyaline, with radial area 

 somewhat dusky. 

 Male.— Length 7 mm. Clypeus flat, closely punctured, the anterior 



