96 Annals of the Carnegie Museum. 



Subfamily METRODORINM. 



Genus Plesiotettix Hancock. 

 Plesiotettix Hancock, Genera Insectorum, fasc. 48, 1906, 34. 



The two species of this genus are very similar but may be separated 

 as follows: 



A. Front end of the pronotum just back of the margin a little upturned. 



uncinatus Hancock. 

 AA. Front end of the pronotum just back of the margin not so upturned. 



spinosa Hancock. 



Plesiotettix uncinatus Hancock. 

 Plesiotettix uncinatus Hancock, Genera Insectorum, fasc. 48, 1906, 34, pi. 3, fig. 22. 

 Habitat. — Pachitea, Peru. Not contained in the material studied. 



Plesiotettix spinosus Hancock. 

 Plesiotettix spinosus Hancock, Genera Insectorum, fasc. 48, 1906, 34. 



Habitat. — Marcapata, Peru. 



This second species difters from the preceding in being decidedly smaller 

 and in not having the lower posterior lateral angles of the pronotum 

 hooked or curved forwards. It too is missing from the Smith collection. 



Genus Cotys Bolivar. 



Cotys Bolivar, Ann. Soc. Ent. Belg., XXXI, 1887, 247. — Hancock, Genera 

 Insectorum, fasc. 48, 1906, 35. 



Cotys antennatus Bolivar. 



Cotys antennatus Bolivar, Ann. Soc. Ent. Belg., XXXI, 1887, 247. — Hancock, 

 Genera Insectorum, fasc. 48, 1906, 35, pi. 4, fig. 34. 



Habitat.- — Peru, S. America. 



Genus Platythorus Morse. 



Platythorus Morse, Biol. Centr.-Am., Orthopt., II, 1900, 8. — Hancock, Genera 

 Insectorum, fasc. 48, 1906, 36. 



Platythorus camurus Morse. 



Platythorus camurus Morse, Biol. Centr.-Am., Orthopt., II, 1900, 8. — Hancock, 

 Genera Insectorum, fasc. 48, 1906, 36. 



Habitat. — Nicaragua and Costa Rica, where it is to be met with on the 

 trunks of trees, among lichens and mosses, the colors of which it imitates 

 to a remarkable degree. The writer has collected it in the vicinity of 

 Juan Vinas at an altitude of between 2,500 and 3,000 feet above sea-level. 

 There is but little doubt of its occurring also in the adjoining northern 

 portions of South America. 



