NO. 1530. THE DECTICINM OF NORTH AMERICA— CA UDELL. 373 



ATELOPLUS LUTEUS, new species. 



Descri^iion. — A much smaller and more slender appearing- insect 

 than A. notatus. The anterior tibiae of both sexes are armed above on 

 the outer margin with three spines. The g-eneral color is yellowish 

 brown, much lighter than in the preceding species. The female has 

 a black dorsal line extending* from the front of the pronotum to the 

 tip of the abdomen composed of two slender lines nearl}^ touching. 

 This dorsalline is not present in the 'male. The posterior femora are 

 not tipped with black and the outer face is not marked with a dusky 

 line except very obscurely so in the male. The most striking pecu- 

 liarities of this species, however, lie in the genitalia. The cerci of the 

 female are similar to those of A. notatuH^ but those of the males are 

 striking!}" different, being curved inward apically and with a slight 

 shoulder on the outer side (fig. 59). The ovipositor is very nearly as 

 long as the posterior femora, being decidedly more than three-fourths 

 as long, as opposed to the two previous species where it is scarcely more 

 than three-fourths as long as the posterior femora. 

 The ovipositor is curved very decided!}^ upward and is 

 scarcel}" atall infuscated apicall}'. 



Measitrements. — Length, pronotum, male, 5 mm., 

 female, 6; posterior femora, male, 14, female, 1.5.5; 

 ovipositor, 15; width, pronotum at the posterior border, fig. 59.— atelo- 

 male, 3.5, female, 4.5. 



' ' ' CERCUSOFMALE. 



Type.— Q^ii. No. I0I8I, U. S. National Museum. 



Speclme7is exmiiined. — The types, one male, one female, Mohave, 

 Arizona (Wickham). 



The small size, the longer ovipositor, and especialh" the form of the 

 cerci of the male will serve to dili'erentiate this species from the pre- 

 ceding ones. 



IDIOSTATUS Pictet. 



Idiostatus Pictet, Mem. Soc. Phys. Genev., XXX, 1888, p. 63. — Scudder, Can. 



Ent., XXVI, 1894, pp. 178, 181; Guide N. Amer. Orth., 1897, p. 56; Cat. 



Orth. U. S., 1900, p. 78.— Kirby, Syn. Cat. Orth., II, 1906, p. 193. 

 Cacopteris Scudder, Can. Ent., XXVI, 1894, pp. 178, 181 (invalid; no species 



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



Proc. Amer. Acad. Arts Sci., XXXV, 1899, p. 87; Cat. Orth. U. S-., 1900, 



p. 78.— Kirby, Syn. Cat. Orth., II, 1906, p. 194. 



Description. — Head moderate in size, inserted well into the pro- 

 notum and scarcely prominent; vertex moderately narrow, about one- 

 third as broad as the interocular space; eyes rounded and quite 

 prominent. Pronotum fairly large and moderately produced poster- 

 iorly; lateral lobes variously developed, in some species being well 

 developed and in others poorly so, but never as shallow as in the genus 

 Ateloplus^ moderately declivent and with or without posterior sinus; 



