BIOLOGICAL PAPERS. 285 



nel, which in turn is bounded externally by the lateral edge of the segment; the 

 second segment has a triangular smooth space medially at the base of the seg- 

 ment, on each side of which is another triangalar space that merges externally with 

 the smooth lateral margin of the segment ; the apical smooth area occupies nearly 

 all of the basal half of the segment and has a sinuate anterior margin ; between 

 this margin and the triangles at the base of the segment is a broad striate, sinu- 

 ate groove or depression; third segment smooth, excepting the crenulate suture, 

 the bifurcation of which is well marked on each side; the remaining abdominal 

 segments smooth, quite convex. Red, tinted with brown and testaceous; poste- 

 rior face of the scape at apex, pedicellum, flagellum, tibiiv and tarsi more or less 

 brown ; posterior edge of the tibiivj of the posterior legs, claws, palpi and tips of 

 the mandibles black. Thinly pubescent with soft, silvery hair. 



Type : University of Kansas. Type locality : Bill Williams Fork, Ariz. Type 

 taken in September, 1903; one paratype taken in August at the type locality. 

 F. H. Snow. 



The paratype measures 8 mm, and is almost exactly like the type in structure, 

 sculpture, and coloration. 



Iphiaulax faustus Cresson. 



One example has the third abdominal segment more coarsely sculptured than 

 the cotypes and is maculated with black; the base of the fourth segment is also 

 black, and the second has the lateral depressions dark brown, nearly black. 



Bill Williams Fork, Ariz. ; August, 1903, F. H. Snow. 



Iphiaulax rugator Say. 



Bill Williams Fork, Ariz. ; August, 1903, F. H. Snow. Congress Junction, 

 Ariz.; July, 1903, F. H. Snow. 



Iphiaulax perepicus, n. sp. 



Related to epicus, from which it is at once distinguished by the larger size 

 and coarser sculpture of the abdomen. 



Female. — Length, 13 mm. Head nearly cubical, depressed and polished be- 

 tween ocelli and antennae; vertex, occiput and cheeks polished, sparsely, indis- 

 tinctly punctured; face finely rugulose, appearing somewhat striate, dull, with a 

 median indistinct furrow extending from the clypeus to between the antenna?; 

 anterior margin of the clypeus curved in by the characteristic basin-like depres- 

 sion beneath it, labrum elevated and keeled, appearing like a nose with fiat sides, 

 the apex pointed downward and backward; temples not as broad as the eyes ; 

 scape polished, sparsely punctured, stout, the margins not appreciably produced, 

 pedicellutn about one-third the length of the first joint of the flagellum, the first 

 joint of the flagellum nearly as long as the next two joints together. Antencje 

 more than eighty-five jointed. Thorax polished; parapsidal grooves of mesono- 

 tum not sharply impressed; metathorax with minute sparse punctures and a 

 longitudinal groove on the pleura below the spiracle starting in a pit near the 

 anterior margin of the pleura; wings very dark, neuration almost exactly as in 

 epicus. Abdomen polished; first segment with an oblong, elevated, convex, 

 smooth portion in the middle, two grooves on each side of the middle space, the 

 innermost groove wrinkled transversely and separated from the outermost groove 

 by a straight fold or ridge, the outermost groove ribbed and bounded externally 

 by the edge of the segment; second abdominal segment with an acute triangular 

 fl't space in the middle at the base of the segment and the apex in the 

 center of the segment where it is continued nearly to the apex as a ridge, 

 a broad, shallow rath ( ? ) V-shaped depression on each side of the middle occupy- 



