March, 1919] BRUES : XoRTH AMERICAN SERPHID.E. 7 



C. abruptus Say. (Fig. 6.) 



Is also not recognizable from the original description. As redis- 

 cribed by Ashmead it can be easily identified, although he does not 

 mention the unusually stout legs. The longer spur of the hind tibia 

 is claw-shaped, being distinctly bent and considerably thickened and 

 the hind metatarsus is scarcely longer than the two following joints 

 together. 



C. obsoletus Say. 



As identified and redescribed by Ashmead it is also a Crypto- 

 ser pints, and as Say's description will not locate the species definitely, 

 should be accepted as fixing the species. 



The two following species may be added: 



Cryptoserphus occidentalis new species. (Fig. 7.) 



$. Length 3-4 mm. Black ; legs, base of antennae and abdomen between 

 the third segment and ovipositor brownish yellow. Head slightly more than 

 twice as broad as thick when viewed from above ; strongly narrowed below 

 the eyes when seen from the front, the malar space as long as the width of 

 the eye, the width of the clypeus, malar furrow indicated as a small fovea 

 next the eye ; anterior margin of clypeus straight or slightly concave. An- 

 tennae slender, moderately long; first flagellar joint five times as long as 

 thick ; second to fifth growing gradually shorter, each about four times as 

 long as thick ; following growing shorter more rapidly, the penultimate a little 

 more than twice as long as thick. Eyes bare. Pronotum nearly half as 

 long as the head, finely transversely striate before the constriction ; humeral 

 angle with a prominent, rounded swelling. Mesonotum with short foveiform 

 parapsidal furrows just behind the humeri, but not indicated elsewhere. Pro- 

 podeum white pubescent, with a median and pair of lateral carinas on its 

 basal half, defining two large, smooth areas ; also with an ill-defined petiolar 

 area on the rather gradually sloping posterior face, which is reticulate ; sides 

 with an indistinct lateral carina extending from the spiracle. Pro- and meso- 

 pleura entirely smooth ; metapleura in the middle with a large shining area 

 bordered below and behind by a raised margin ; depressed, finely sculptured 

 and pale pubescent elsewhere. Abdominal petiole very short, concealed above 

 by the margin of the second segment; base of second segment with numerous 

 basal striae half as long as the posterior trochanter. Ovipositor slender, 

 slightly curved apically, as long as the basal three joints of the posterior 

 tarsus. Legs slender, longer spur of posterior tibia distinctly more than half 

 as long as the metatarsus. Wings hyaline, stigma not very broad ; radial 

 cell as long as the stigma along the costal margin ; other nervures not indi- 

 cated by streaks. 



Four specimens : type and one other from Chatcolet Lake, Idaho, 



