ACRIDID^E. 683 



Male. Greenish, slender, yellow beneath. Head smooth, slightly 

 elongated ; vertex with two curved brown lines which are approximate in 

 front ; lip flat, fusiform ; front slightly oblique, with four slight keels ; 

 inner keels nearly parallel ; outer keels diverging towards the face ; an 

 oblique brown streak between each eye and the face. Eyes testaceous, 

 straight in front, very much rounded on the hind side. Antenna3 piceous, 

 tawny at the base. Prothorax very finely scabrous, partly brown ; disk 

 flat, with three distinct keels ; transverse impressed lines very slight ; fore 

 border, sides and hind border slightly rounded. Prosternal spine stout, 

 conical, moderately long, about twice as broad as thick. Legs ferruginous, 

 yellowish beneath ; hind femora as long as the abdomen ; hind tibiae red, 

 much shorter than the hind femora, their spines with black tips. Length 

 of the body 9 lines. 



The wings are rudimentary in the specimen described, which is not fully 

 developed. 



a. Orizaba, Mexico. From M. Salle's collection. 

 South America. 



A. Prothorax with two yellow stripes. - - vorax. 



B. Prothorax with no yellow stripes. 



a. Hind tibiae red. - - - dominator. 



b. Hind tibiae green. - alienus. 



In C. dominator the genus Caloptenus attains its largest dimensions. 



C. alienus is described from an immature specimen ; it differs from the 

 typical form, and has some affinity to Acridium. 



17. CALOPTENUS VORAX. 

 vorax, Sauss. Rev. Zool. xiii. 162. 

 Brazil. 



18. CALOPTENUS DOMINATOR. 



Mas. Ferrugineus, sat validus ; fastigium fere rotundum ; prothorax 

 scaber, disco subtricarinato fere piano, margine postico rotundato; 

 prosterni spina robusta, conica, subtransversa ; femora postica abdo- 

 mine paullo longiora, intus nigro uniplagiata, subtus nigra, fascia 

 subapicali picea ; tibia postica rufa, spinis pallide flavis apice 

 nigris ; al<e anticce cinerece, corpore multo longiores. 



Male. Ferruginous, rather stout. Head smooth, moderately long ; 

 tip of the vertex depressed, nearly round ; front thinly punctured, with 

 four slight keels which diverge towards the face. Eyes lurid, elongate- 

 elliptical, much rounded on the hind side. Prothorax scabrous; disk 

 nearly flat, with three slight keels; transverse impressed lines distinct; 

 fore border and sides slightly rounded, the former slightly notched ; hind 

 border more rounded. Prosternal spine stout, conical, slightly transverse, 

 moderately long. Hind femora a little longer than the abdomen, black 

 beneath, with an elongated black patch on the inner side, and with a piceous 



