56 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL.XX. 



metastetliia together much longer than broad; interspace between 

 mesosternal lobes generally twice as long as broad in the male, almost 

 equally narrow or subquadrate in the female, the metasternal lobes 

 subattingent in both sexes. Tegmina and wings always present, gen- 

 erally fully developed or a little abbreviate, but sometimes lobate. 

 Fore and middle femora of male tumid; hind femora long and slender, 

 somewhat compressed, generally surpassing the abdomen, the superior 

 carina slight, unarmed; hind tibiae feebly ampliate apically, with 

 spines of similar length on the two sides; first joint of hind tarsi 

 scarcely longer than the third, the second small, with a large inferior 

 apical lobe; aroliuin rather large, nearly twice as long as broad. Sub- 

 genital plate of male furnished with a prominent, subapical, more or 

 less conical tubercle, the lateral margins of the plate suddenly ampliate 

 at base; furcula always distinctly present as a pair of projecting lobes; 

 last abdominal segment of female not abbreviate, the ovipositor nor- 

 mally exserted. 



The type is H. festivus Scudder, a species mistaken for H. viridis 

 Thomas at the time the genus was described. 



This genus is closely related to Hypoclilora and Campylacantha, but 

 is separated from them by the basal ampliation of the margins of the 

 subgenital plate of the male. One of the species indeed (the most 

 aberrant one) was originally placed by Brunuer in Hypoclilora. The 

 genus is still more closely allied to Aeoloplus, from, which it is separable 

 by the form of the prouotum and the slenderness of the body. 



It is found across the United States, but only a single species is 

 known east of the Great Plains, and that one has only been found on 

 or near the Atlantic border. It is generally characteristic of the West. 



Many of the species are very closely allied and have hitherto been 

 confounded by all observers. A large amount of material now enables 

 rne to distinguish them and to find characters which will rarely fail of 

 tolerably certain separation. 



ANALYTICAL KEY TO THE SPECIES OF HESPEROTETTIX. 



A 1 . Metazona of pronotum distinctly punctate on dorsnm; prozona smooth, except 

 sometimes feebly punctate on dorsum; nowhere rugulose. 



6 1 . Pronotum highly and irregularly diversified in color, or else nearly devoid of 

 markings of any kind, the dorsum nearly plane; tegniina in the diversified species 

 marked with a white or pallid stripe on the division line between the discoidal 

 and anal areas. 



c 1 . Transverse sulci of the pronotum distinctly marked in black; hind femora 

 with a distinct pregenicular annulation. 



d l . Relatively slender-bodied, with slender femora; tegmina rarely as short as 

 the body and then only in male; antennae of male slender, distinctly longer 



than the head and pronotum together 1. viridis (p. 57). 



d*. Relatively stout-bodied, with stout femora; tegmina surpassing the body 

 only in the male and then but slightly; antennae of male coarse, scarcely 



longer than the head and prouotum together 2. meridian alitt (p. 59). 



c". Transverse sulci of pronotum not marked in strong colored contrast to sur- 

 roundings; hind femora without red pregenicular annulation or only faint signs 

 of one 3. festivus (p. 60). 



