March ,S<59.] PSYCHE. 333 



Of the remaining five genera, it may occur in the southern and eastern parts 



be said that the occurrence of Fhocta- of the State. It is altogether probable 



liotcs, Hespcrotettix and Dcndrokttix was too that a considerable number of 



quite to be expected. Campylocantha , Texas forms will l)e found in the valley 



however, has not been reported so far of the Red River in Southwestern 



east before and Paratylatropidia has Arkansas. 



hitherto been known by a single pair The keys which follow have been 



of specimens from localities so widely based directly upon females, though 



separated as Texas and Dakota. they should apply nearly equally well to 



Paroxya may certainly be expected to males. 



Key to Genera ok Melanopli found in Arkansas. 



A' Frontal costa not twice as wide below the ocellus as between the antennae. 

 I!'. Shoulders of the pronotum well rounded, disk subtectiform ; frontal costa 

 percurrent, and sulcate to the clypeus. 



C' Eyes separated by a space several times as wide as the basal joint of the 

 antennae ; tegmina less than half the length of the abdomen ; median 

 carina of the pronotum cut by the first and second sulcus. Campylacanlha. 

 C' Eyes separated by a space but little wider than the basal joint of the 

 antennae; tegmina much more than half the length of the abdomen; 

 median carina of the pronotum not cut by either the first or the second 

 sulcus. Hespcrotettix. 



V? Shoulders of the pronotum decidedly angulate, at least on the metazone, 

 frontal costa rarely percurrent and never sulcate to the clypeus. 



Q} Space between the eyes nearly as broad as the transverse diameter of the 

 eye, posterior margin of the pronotum scarcely more distinctly angulate 

 than the anterior. 



D' Transverse sulci of the pronotum very deep, the first two as distinct 

 as the last, all cutting the median carina ; shoulders of the prozone well 

 rounded. ......... Dendrotettix. 



D" Transverse sulci of the pronotum not especially deep, the first two 



much less distinct than the third, shoulders of the prozone not less 



plainly angulate than those of the metazone. Paratylatropidia. 



C^ Space between the eyes narrower than the transverse diameter of the 



eyes; posterior margin of the pronotum usually much more angulate than 



the anterior. ......... Mclanopliis. 



A- Frontal costa twice as wide below the ocellus as between the antennae, head 

 very large in proportion to the body. ..... Phoctaliotes. 



