406 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxii. 



the genus have been studied but much more material and field observa- 

 tion is necessary to satisfactorily place the various forms. The genus 

 is distinct and ver}^ well circumscribed but the species seem in a 

 hopeless state of chaos. The females are, at the present state of our 

 knowledge of the genus, practically inseparable. Scudder has, it is 

 true, pul)lished a table of species based upon characters supposedly of 

 synoptic value but a study of t3^pe material in his collection shows 

 some of the characters used by him in his table to be inversely true. 

 Thus the pronotal disk of horealis is more nearly twice as long as 

 broad as is that of iMllidijpalpk. The length of the posterior femora 

 varies as does the color. Therefore, I have made no attempt to 

 synoptically separate the various forms, this being deemed imprac- 

 ticable at this time. The described species are as follows: 



STEIROXYS TRILINEATA Thomas. 



Thamnotrlzon triUneatus Thomas, Proc. Acad. Nat. Sci. Philad., 1870, p. 76; Ann. 

 Kept. U. S. Geol. Surv. Terr., II, 1871, pp. 265, 268.— Glover, 111. N. A. Ent, 

 Orth, 1872, pi. viii, fig. 5.— Scuddee, Index N. A. Orth, 1901, p. 322. 



Deeticus Irilineutus Thomas, Ann. Kept. U.S. Geol. Surv. Terr., V, 1872, p. 443.— 

 Bruner, Bull. No. 27, Div. Ent. U. S. Dept. Agric, 1892, p. 31.— Scudder, 

 Index N. A. Orth, 1901, p. 95. 



Declea trilmeaius Bruner, Publ. Nebr. Acad. Sci., Ill, 1893, p. 31. 



Steiroxys tnlineatn Herman, Verhandl. der k. k. Zool.-Bot. Gesellsch. Wien., 

 XXIV, 1874, p. 207, pi. v, figs. 64-69.— Scudder, Can. Ent., XXVI, 1894, 

 pp. 182, 183; Cat. Orth. U. S., 1900, p. 79; Index N. A. Orth., 1901, p. 300.— 

 Scudder and Cockerell, Proc. Davenp. Acad. Nat. Sci., IX, 1902, p. 55. — 

 KiRBY, Syn. Cat. Orth., II, 1906, p. 194. 



Description. — Head small and deeply inserted into the pronotum; 

 vertex convex and moderately prominent, very broad, occupying 

 practically all the interocular space; eyes of moderate size, rounded 

 and not prominent, Pronotum and wings as described under the 

 genus. Legs moderately long, the posterior femora about three times 

 as long as the pronotum, swollen on the basal two-thirds and unarmed 

 below; anterior ti))iie armed above on the outer side onl}^ with three 

 spines, rarely one of them missing. Abdomen plump, dorsally sub- 

 carinate; cerci of the female round, about four times as long as the 

 basal width and tapering to a point, tapering mostly in the apical half; 

 cerci of the male (fig. 91) c^dindrical or somewhat flattened and tapering 

 graduall}" to a point, curved downward and inward at the tip, and fur- 

 nished on the inside about or just beyond the middle with a slightly 

 recurved tooth cylindrical and shaped like the end of the main bod}'; 

 ovipositor al)out as long as the posterior femora and curved some- 

 what upward, the tip abruptly tapering to a point and roughened by 

 minute serrations. 



Color dark brown or yellowish, usually with some lighter markings 

 down the dorsum, sometimes lighter with a row of conspicuous V- 



