March, 1919] BRUES : NORTH AMERICAN SeRPHID.E. 3 



7. Abdomen, except base and apex, ferruginous or bright rufous ; legs yellow 



or honey yellow 8 



Abdomen black or sometimes partly dull rufous, legs strongly infuscated.. 10 



8. Radial cell very short, not longer than the width of the radial vein. 



linellii Ashm. 

 Radial cell at least one third as long as the stigma 9 



9. Propodeum without any trace of a median longitudinal carina, gradually 



sloping behind rufigaster Prov. 



Propodeum with a median carina distinct at least at the base. 



terminalis Ashm. 



10. Propleura with a broad, convexly raised longitudinal band extending along 



its upper portion, separated from the upper edge by a striated groove ; 



abdomen brownish at the base sequoiarum sp. nov. 



Propleura flat or concave, without a raised band 11 



11. Abdominal petiole as broad as long; black with legs, except tibiae and 



tarsi, piceous cockerelli sp-. nov. 



Abdominal petiole transverse, much shorter than broad 12 



12. Malar furrow present florissantensis Rohwer. 



Xo malar furrow debilis sp. nov. 



Serphus zabriskiei new species. (Fig. 1.) 



$. Length 6 mm. (exclusive of ovipositor). Black, abdomen ferruginous 

 beyond the petiole ; legs fulvo-ferruginous, four posterior coxae piceous, lighter 

 at tips, tegulae fuscous ; antennae brown at extreme base. Head slightly more 

 than twice as wide as thick ; malar space slightly longer than the width of 

 the mandibles at base, with a distinct furrow ; clypeus broad, its anterior mar- 

 gin convex, its surface densely punctate. Eyes bare. Antennae very slender ; 

 scape twice as long as thick, flagellar joints gradually shortened after the first, 

 which is over five times as long as thick; penultimate joint three times as 

 long as thick. Pronotum one-third as long as the mesonotum, transversely 

 striate in front of the constriction ; distinctly trilobed behind. Propleura 

 obliquely striate on its lower half, irregularly longitudinally striate above, 

 without the large, smooth space that is usually present. Mesopleura with a 

 series of longitudinal striae on its upper half in front of the convex portion, 

 behind with a series of crenate punctures along the edge, which extend for- 

 ward to form grooves on the posterior third of the lower half of the meso- 

 pleura. Propodeum coarsely rugose-reticulate, without areas or any trace of 

 any longitudinal carina. Abdominal petiole quadrate, about as wide as long ; 

 second segment at base above with grooves as long as the petiole ; ovipositor 

 two thirds as long as the remainder of the abdomen, straight except at the 

 tip, which is strongly curved downward. Legs slender, tarsal claws simple ; 

 longer spur of hind tibiae one third as long as the metatarsus, the latter as 

 long as the two following joints together. Wings tinged with brownish; ra- 

 dial cell very short, not longer than the width of the radial vein, the latter 

 distinctly prolonged downward and surrounded by a small brown clouded 

 area ; discoidal vein indicated as a fuscous streak. 



