58 bulletin: museum of comparative zoology. 



Tryphon Fallen. 



Key to the Florissant species of Tryphon. 



1. Antennae filiform as usual in the genus; abdomen sessile or 



broadly petiolate 2. 



Flagellum of antennae very distinctly thickened or flattened 

 medially; abdomen strongly petiolate . T. lapideus, sp. nov. 



2. Stigma broad, more or less triangular in outline 3. 



Stigma long and narrow, lanceolate 4. 



3. Submedian cell considerably longer than the median; first ab- 



dominal segment with discal carinae only on the basal half. 



T. cadaver, sp. nov. 



Median and submedian cells of equal length, discal carinae on 



first segment of abdomen extending to the tip. T. senex, sp. nov. 



4. Median and submedian cells of equal length, abdomen rather 



distinctly petiolate T. peregrinus, sp. nov. 



Submedian cell considerably longer than the median, abdomen 

 broadly sessile T. jiorissantensis, sp. nov. 



Tryphon lapideus, sp. nov. 



Length 7.5 mm. Black, the legs brownish and the abdomen beyond the 

 first segment brownish or reddish. Antennae very short and stout; two- 

 thirds the length of the body and very distinctly thickened (? flattened) 

 near the middle of the flagellum; about 20-jointed, joints near the base fully 

 twice as long as wide; those toward the apex of the broadened portion dis- 

 tinctly wider than long. Surface of head and all of thorax and pleurae shining, 

 impunctate. Metathorax very distinctly areolated, but apparently not com- 

 pletely so. Abdomen quite distinctly petiolate, the petiole as long as the 

 slope of the metathorax and gradually enlarged to the tip; second segment 

 wider (seen in lateral view), but only one-half as high as long at apex, slightly 

 shorter than the first; third longer than the second and distinctly more than 

 half as high as long; following segments shorter and higher. Legs moderately 

 stout. Wings quite distinctly infuscated, the stigma long and lanceolate; 

 submedian cell very little longer than the median; cubitodiscoidal cell long, 

 its narrowed apical portion being elongated. Areolet open at apex. Marginal 

 cell rather broad and short. First recurrent nervure broken at the middle. 



Type.— No. 2235, M. C. Z., Florissant, Col. (No. 1796, S. H. 

 Scudder Coll.). 



This is a very puzzling specimen and I do not feel satisfied with its 

 present location although it is no doubt a member of the Tryphoninae. 



