100 Bulletin of the Brooklyn Entomological Society Vol. XII 



margin with a median emargination ; distance between the eyes at the 

 clypeus distinctly greater than the length of an eye; front closely punc- 

 tured, some of the punctures confluent; posterior orbits and vertex shining 

 with rather close punctures; seen from above the anterior width of the 

 head is nearly twice as great as the cephalo-caudad length; head distinctly 

 narrowing behind eyes; ocellocular line nearly twice as long as the post- 

 ocellar line; third antennal joint distinctly longer than the fourth; anten- 

 nal joints 6-9, distinctly produced beneath; scutum shining, sparsely punc- 

 tured and with a few oblique wrinkles; otherwise as in female. 



Type Locality. — Monterey County, California, one female in April; allo- 

 type and one paratype male from San Mateo County, California, in March ; 

 paratype female Placerville, California, reared from an oak gall by F. B. 

 Herbert. 



Type.— Cat. No. 21562 U. S. Nat. Mus. 



Pemphredon rileyi Fox. — Type : Cat. No. 1884 U. S. Nat. Mus. Female. 



Type Locality. — Placer County, California, September (A. Koebele). 

 See remarks under errans Rohwer. 



Male. — Length 8.5 mm. Clypeus flat, with fine, close punctures, the an- 

 terior margin with a median emargination; distance between the eyes at 

 the clypeus distinctly greater than the length of the eye; front closely, 

 sometimes confiuently punctured; posterior orbits and vertex shining with 

 separate distinct punctures, seen from above the anterior margin of the 

 head is not merely twice as wide as the cephalo-caudad length, scarcely 

 narrowing behind the eyes ; ocellocular line about one half longer than the 

 postocellar line; third antennal joint distinctly longer than the fourth; 

 antennal joints 6-9 prominent beneath; scutum punctat'o-striate anteriorly, 

 sparsely punctured posteriorly; scutellum striato-punctate ; propodeum 

 like errans; petiole distinctly sulcate laterally, longer than the hind basi- 

 tarsis. Black; wings hyaline, faintly smoky. 



Described from two males from Pyramid Ranger Station, California, 

 collected on Sambucus glauca by F. B. Herbert, August 20, 1915. 



Pemphredon cockerelli Rohwer. — Pemphredon cockerelli Rohwer, Trans. 

 Amer. Ent. Soc, Vol. 35, 1909, p. 103. 

 This is a male and not a female, and is allied to confertim Fox. 



Pemphredon angularis Fox. — A female collected on the campus of the 

 University of Colorado at Boulder by T. D. A. Cockerell. 



Pemphredon shawii new species. — Male.—Ltngih. 8 mm. Clypeus con- 

 vex, subopaque, with sparse, well-defined punctures, the anterior margin 

 depressed, with a deep, arcuate, median emargination ; the distance be- 

 tween the eyes at the clypeus much greater than the length of the eye; 

 frons opaque with close, sometimes confluent punctures; posterior orbits 

 punctured similar to but more sparsely than the front; seen from above 

 the head is much wider anteriorly than it's cephalo-caudad length and dis- 



