March, 1919] Brues: Xorth American Serphid.e. 5 



more than twice as broad as thick. Clypeus higher and less strongly narrowed 

 below than usual, only twice as broad as high, anterior edge slightly arcuate, 

 surface moderately punctate. Malar space longer than the width of the man- 

 dibit at base, with a fine, distinct furrow. Antenna? slender; scape one half 

 longer than thick; first four flagellar joints scarcely decreasing m length, 

 each fully five times as long as thick ; penultimate joint over four times as 

 long as thick. Pronotum transversely striate in front of the constriction, tri- 

 lobed behind, with the lateral lobes more prominent than the median one. 

 Mesonotum with well marked vestiges of parapsidal furrows. Propleura ir- 

 regularly and more or less obliquely striate on its lower anterior half ; above 

 with a series of five longitudinal striae below the upper edge. Mesopleura 

 striate between the raised portion and the tegulae and anteriorly below ; below 

 with a series of punctures inside the edge and a small roughened area above 

 the middle coxa. Propodeum coarsely rugose-reticulate, with a complete 

 median raised line;' long and very gradually sloping behind. Abdominal 

 petiole as long as broad, roughly rugose, with a median channel above; 

 striate-reticulate below ; second segment with the grooves at base extremely 

 short, shorter than the petiole. Legs long and slender; longer spur of hind 

 tibia one third as long as the hind metatarsus ; all tarsal claws simple. Wings 

 faintly tinged with brownish ; stigma moderately broad ; radial cell nearly 

 half as long as the stigma ; both sections of the radial vein prolonged into the 

 wing as brown streaks, each for a distance somewhat exceeding its own 

 length ; cubital and discoidal veins indicated as brownish streaks. 



Type from Eldora, Colorado, August 18. Collected and sent me 

 by Prof. T. D. A. Cockerell. 



Serphus debilis new species. (Fig. 4.) 



<£. Length 4 mm. Black; tegulse, knees, front tibiae and base and apex 

 of four posterior tibiae brownish yellow ; abdomen beyond petiole dull rufous 

 above, especially on the second segment. Head nearly two and one half 

 times as long as thick ; ocelli in a nearly equilateral triangle, the posterior 

 ones much farther from the eye-margin than from one another. Malar space 

 longer than the width of the mandible at base ; no malar furrow ; clypeus 

 over three times as broad as high, its anterior margin nearly straight. An- 

 tennal scape twice as long as thick; flagellar joints gradually decreasing in 

 length, the first nearly five times as long as thick ; second somewhat stouter, 

 four times as long as thick. Pronotum transversely striate before the con- 

 striction, lobed on each side behind ; parapsidal furrows obsolete, but evident 

 as slight depressions. Propodeum long, very gradually sloping behind, finely 

 rugose, with a complete, but not strongly defined, median carina. Propleura 

 finely longitudinally striate along its upper edge, below and in front irregu- 

 larly rugulose-striate ; mesopleura with a large, finely striated area below the 

 tegulae and a coarsely striated one in front below : punctures along hind 

 margin prolonged as striae on the lower half of the pleura ; metapleura finely 

 rugose throughout. Abdominal petiole transverse, seen from above less than 



