March, 1919.] BRUES : XoRTH AMERICAN SERPHID.E. 9 



Phaenoserphus Kieffer. 



The only North American species belonging to this genus which 

 I have seen is the following: 



Phaenoserphus longipes new species. (Fig. 9.) 



$. Length 4.8 mm. Black; legs honey yellow; hind coxae black; base 

 of middle coxae and middle and hind trochanters fuscous; antennal scape 

 yellow below. Head slightly more than twice as broad as long, strongly nar- 

 rowed behind the eyes ; clypeus short and broad, only one fourth as high as 

 its greatest width ; malar space one and one half times as long as the width 

 of mandible at base, no malar furrow. Antennae moderately thick, with long 

 joints clothed with short pubescence ; scape stout, nearly cylindrical, twice as 

 long as wide; first flagellar joint about four times as long as thick; following 

 gradually decreasing in length and thickness, the penultimate two thirds as 

 long as the first and three times as long as thick. Pronotum greatly con- 

 stricted at the middle, transversely striated in front ; its hind angles pro- 

 duced into a distinct rounded swelling. Mesonotum with faint traces of 

 parapsidal furrows anteriorly. Metathorax coarsely rugose-reticulate, with a 

 median carina on its superior face and a somewhat indistinct rounded petiolar 

 area behind ; on each side of the median carina is a smoother space bounded 

 by indistinct carina?, but these basal areas are not clearly defined. Pro- and 

 mesoplurae entirely smooth and shining, the latter with a series of large 

 foveate punctures inside its posterior edge. Metapleurae rugose, without any 

 smooth space. Abdominal petiole twice as long as broad seen from above, 

 longitudinally ribbed and transversely rugose between the ribs ; second seg- 

 ment long, narrow basally, at base with striae less than the length of the 

 petiole. Legs long, but not very slender, tarsal claws simple ; longer spur of 

 hind tibiae barely longer than one third the length of the metatarsus. Wings 

 distinctly tinged with brownish ; stigma and radial veins fuscous, the cell 

 about half as long as the stigma ; both sections of the radial vein extending 

 into the wing as brownish streaks ; radial and cubital veins prolonged as 

 brownish streaks. 



One specimen from Almota, Wash., June 24 (A. L. Melander). 



Exallonyx Kieffer. 

 Key to North American' Species. 



1. Antennal joints short; flagellum slightly thickened toward tip; penulti- 



mate joint quadrate or at least scarcely twice as wide as long ; basal 



joints in male simple - 



Antennal joints elongate, flagellum distinctly attenuated toward tip ; pe- 

 nultimate joint about three times as long as thick; basal joints in male 

 frequently with a tooth on the external margin 5 



2. Head one and one half times as long as wide ; eye removed from posterior 



margin of head by more than its greatest length. I F 2 



angusticeps Brues. 



