310 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxii. 



Measurements. — Lenoth, pronotum, 9 mm.; elytra, 11; posterior 

 femora, 21; width, pronotum, acYoss metazono, 0; posterior femora, at 

 widest point, 3; at narrowest point, 1.5. 



Type.—QdX. No. 10164, U. S. National Museum. 



Specimens examined — One male, the t^^pe (tig-. 18), Hawthorne, 

 Nevada, June (Wickham). 



This interesting insect, donated to the National Museum l)y Profes- 

 sor Bruner, is very peculiar in the posterior femora being but compar- 

 atively little swollen basally and })y the round, coal-black wings. In 

 both these respects it is allied to the members of the genus Plagiostira^ 

 but the armed prosternum and non-carinate pronotum prove it to be 

 not at all allied to that genus. 



CAPNOBOTES Scudder. 



CapnohotcH Scudder, Can. Ent., XXIX, 1897, pp. 73, 74; Guide N. A. Orth., 

 1897, p. 55; Cat. Orth, U. S., 1900, p. 76.— Cockerell, The Ent., XXXVII, 

 1904, pp. 178-181.— KiRBY, Syn. Cat. Orth., II, 1906, p. 181. 



Description. — Head moderately large, eyes of medium size, hemis- 

 pherical; vertex prominent, narrow, about one-half as broad as one e^'e. 

 Prosternum armed with a pair of sharp spines; mesosternum and 

 metasternum with the angles spinelike, those of the mesosternum 

 especially often forming well-developed spines, though l)lunter than 

 those of the prosternum. Pronotum of moderate size, considerabl}' 

 produced backward over the base of the wings; disk fiat behind, in 

 front convex, Y)osterior margin rounded, anterior margin truncate; 

 lateral carina^ subparallel, distinct only on the hinder portion; median 

 carina absent; lateral lobes well developed, nearly as deep as long, 

 almost vertical, the posterior margin sinuate, the humeral angle dis- 

 tinct; lower ])order straight, slightly oblique. Wings and elytra both 

 present and well developed, longer than the l)ody in both sexes; elj^tra 

 long and slender, those of the male furnished with an oval transparent 

 spot on the right tympanum, the correspontling spot of the left tym- 

 panum opaque; wings long and broad, rapidh' tapering apically. Legs 

 moderately slender; posterior femora about four times as long as the 

 pronotum, considerably swollen on the l)asal half and arnied below with 

 a numV)er of small spines; tibii\^ of approximatelv the same length as the 

 corresponding femora, the anterior ones armed above on both margins or 

 only on the outer, the number of spines variable, below armed on both 

 margins, sometimes scarce!}' so on the outer margin. Subgenital plate 

 apicall}" triangularly forked, the branches carinate below and termi- 

 nating in the male with a pair of cylindrical styles; supraanal plate con- 

 cealed }>eneath the last abdominal segment, which projects backward 

 as two long processes, being furcate nearly to the base; cerci long, 

 subcylind"ical, simple in the female, in the male toothed on the iimer 



