394 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxii. 



IDIONOTUS Scudder. 



Idionotiix Scudder, Can. Ent., XXVI, 1894, pp.- 179, 182 (invalid, no species 

 included); Guide N. A. Orth., 1897, p. 56 (invalid, no species included); 

 Cat. Orth., U. S., 1900, p. 79. 



Description. — Head mediiiin in size; vertex moderately or scarcel}' 

 at all prominent, broad more than one-third as broad as the interocidar 

 space; eyes small, usuall}" somewhat prominent. Pronotum medium, 

 not greatly produced posteriorly; hiteral lobes well developed, nearly 

 as deep as long, considerably decliv.ent and moderately sinuate posteri- 

 ori}^; lateral carinie sharp, except in sahcarinata., persistent and 

 strongly or moderately convergent at the middle of the anterior half; 

 median carina absent or barely indicated on the posterior third of the 

 pronotum; disk nearly flat, marked about the middle b}^ an inconspicu- 

 ous U-shaped sulcus or a transverse sulcus, truncate before and behind 

 or broadly rounded posteriorly. Prosternum unarmed. Legs long, 

 the posterior femora more than two times as long as the pronotum, 

 subparallel on the apical two-fifths, the basal portion considerably 

 swollen, unarmed beneath or armed on both margins with a few short 

 spines; anterior tibite armed above on the outer side only with three_ 

 spines, rarely but two. Elytra nearly touching above and slightly 

 projecting be3"ond the pronotum in the female, except in suhcarinatus.^ 

 where they are concealed; in the male, where known, the elytra over- 

 lap above and project beyond the pronotum a distance equal to one- 

 half the length of the pronotum or more. Subgenital plate of ])oth 

 sexes apically notched, the apical styles of the male stout, fusiform; 

 last abdominal segment triangular and entire in the female, in the male 

 triangularl}^ incised apically; cerci simple in the female, in the male 

 armed at the extreme base with an inner spine and sometimes with a 

 short apical spine." Ovipositor short and stout, no longer than the 

 posterior femora, abruptly tapering to a sharp point. 



Type. — Idlonotm hrunneiis Scudder. 



The median dorsal spine of the anterior tibia? is sometimes missing, 

 but the normal number seems to be three. 



Kirb}' '^ places this genus in the synonymj^ under the genus Nedvha 

 of Walker. In this he is certainly in error, the type of Xeduha being 

 the same as that of Tropisaspis. 



We have three species of this genus, separable as follows: 



KEY TO THE SPECIES OF IDIONOTUS. 



A. Lateral carinte of the pronotum sharp, distinct. 



B. Posterior femora three or more times as long as the pronotum ; cerci of the male 

 no longer than broad and armed on the outer apical extremity with a sharp 

 point, fig. 79^ brunneus, p. 395 



'^'This l)asal spine is not easily observed unless the cerci are unusually exerted. 

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



