2 Journal New York Entomological Society. [Voi.xxvu. 



genera, Serphus (=Proctotrypes), Cryptoserphus, Phccnoscrphus 

 and Exallonyx.* In the Genera Insectorum he has distributed the 

 North American species in these genera, but has made a few errors 

 owing to lack of North American material. Some of these I have 

 been able to correct, although I have not been able to place definitely 

 several species which I have not seen. In the genera Sefphus and 

 Exallonyx in addition to the descriptions of new species, I have 

 appended keys for the separation of the Nearctic forms with the 

 omission of a few that could not be located generically. 



Many of the new species are from the far West, received from 

 time to time from Professor A. L. Melander, who collected them 

 mainly in Washington. From our present knowledge, it would ap- 

 pear that the family is better represented on the Pacific slope than in 

 the eastern United States, although it is evident that the forms in 

 the East are as yet far from all known. 



The figures were all drawn by Mrs. C. T. Brues from camera 

 lucida pencil sketches. 



Serphus Schrank. 



Key to North American Species. 



i. Petiole of abdomen twice as long as thick; abdomen rufous except at tip. 



melliventris Ashm. 

 Petiole of abdomen not longer than thick, usually shorter 2 



2. Antennal joints long, third joint over four times as long as thick .... 3 

 Antennal joints shorter, the third only three times as long as thick; body 



black nevadensis Kieff . 



3. Head, and also most of the rest of the body, ferruginous or rufous... 4 

 Head and thorax black, abdomen often rufous in considerable part ... 5 



4. Rugosities of propodeum forming distinct longitudinal lines medially and 



basally, no distinct median longitudinal carina ; propodeum black or 



piceous caudatus Say. 



Propodeum irregularly rugose, but with a distinct median carina body en- 

 tirely rufous or fulvous pallidus Say. 



5. Propleura with a large, smooth, shining area above the middle, irregularly 



striate elsewhere 6 



Propleura without a large, smooth area ; its entire surface irregularly 

 striate or sculptured zabriskiei sp. nov. 



6. Propodeum irregularly rugose, with at most a median carina 7 



Propodeum with the rugosities forming a series of longitudinal lines ; pro- 

 podeum long and gradually sloping; abdomen and most of legs reddish. 



longiusculus Brues. 



4 First described in Bull. Soc. Hist. Nat. Metz, vol. 11, p. 34 (1904)- 



