NO. 2093. GRASSHOPPERS OF THE FAMILY ACRIDIDAE—CAUDELL. 27 



covered for their entire length with small, clear-cut dark dots on the 

 pale ground color. The wings of the unique type are clear hyaline, 

 and the hind tibiae are very faintly tinged with bluish and bear eight 

 black-tipped spines on the outer margin above; terminal calcars long, 

 the outer pair about twice as long as the adjacent dorsal spine; pos- 

 terior femora with three or four dark spots above. 



Length: Pronotum, 3.5 mm.; elytra, 19 mm.; hind femora, 12 mm. 



Tyj^e.— In United States National Museum. Cat. No. 18483, 

 U.S.N.M. 



This is an interesting little species, and bears such superficial 

 resemblance to Xeracris minima as to make its confusion with that 

 insect very likely unless considerable care is exercised. 



HELIATJLA, ne-w genus. 



The author's first acquaintance with Aulocara rvfum of Scudder 

 was in 1903, when he described specimens from Kansas and Colorado 

 as new under the name Heliastus guanieri. Failure to associate it 

 with Scudder's description was due to the fact that its generic charac- 

 ters did not at all indicate relationship to Aulocara. Nor is its rela- 

 tionship much nearer, if any, to Heliastus than to Aulocara. There- 

 fore, at the suggestion of Messrs. Rehn and Hebard, it is removed 

 from both the above genera and for it the new generic name Heliaula 

 is here proposed. The following key will serve for the separation of 

 this genus from others allied to Heliastus. 



Key to the genus Heliastus and allies. 



Metasternal interspace broadly transverse in the female, in the male at least as long 

 as broad. 

 Elytra with a distinct intercalary vein. 

 Calcaria of hind tibiae long, the outer pair about twice as long as the adjacent dorsal 



spine Coniana Caudell. 



Calcaria of hind tibiae shorter, the outer pair but little longer than the adjacent 



dorsal spine Ancoiiia Scudder. 



Elytra without a distinct intercalary vein. 

 Body and hind femora stout, the latter at its widest part nearly or quite aa broad 

 as the head across the eyes. 

 Pronotum conspicuously narrowing anteriorly; interocular space narrower than 

 the width of one of the eyes, the scutellum of the vertex with well elevated 



margins Heliastus Saussure. 



Pronotum quadrate, no narrower anteriorly than posteriorly; interocular space 

 as broad as the width of one of the eyes, the scutellum of the vertex with the 



margins low Heliaula Caudell. 



Body and hind femora slender, the latter at its widest part scarcely more than one- 

 half as broad as the head across the eyes Eamona Bruner. 



Metasternal interspace quadrate or barely transverse in the female, in the male dis- 

 tinctly longer than broad Xerocris Caudell. 



