138 PROCEEDINGS OF THE ACADEMY OF [April, 



worthy in a number of ways. The first is, that, although the 

 median carina of the pronotum is as highly cristate as in the average 

 of the genus Nomotettix, they lack the characters of the fastigium 

 and of the frontal costa found in that genus. The second is, that 

 the frontal costa is more widely scutellate between the antennal 

 bases than in the other forms of Neotettix, the width of the same 

 being about one-half that of the very broad fastigium. The third and 

 most striking is, that while the specimens in general size and character 

 of integument are fully adult, they lack the usual bisinuate form 

 of the caudal margin of the lateral lobes of the pronotum of the 

 adult. That the material is adult is proven, however, by the presence * 

 of distinctly developed tegmina and wings in the female sex and wings 

 only in the male sex, entirely or partially hidden under the pronotum. 

 This very remarkable condition, i.e., the retention of an immature 

 pronotal type into the adult condition, has, however, been found to 

 exist in species of the genus Acrydium, for a discussion of which see 

 the comments of the senior author on the African A. dasynotum and 

 virunganum. 50 A similar condition in Acrydium kraussi, from 

 Sweden, has recently been described by Haij as variety paradoxa. 

 That this condition is deep seated in the subfamily is quite apparent, 

 and it is equally evident that it is characteristic of certain species 

 and again occurs as a variant in species normally of the usual type. 



Key to the Southeastern Species of Neotettix. 



A. — Lateral lobes of the pronotum with caudal margin unisinuate. 

 Tegmina absent (d 71 ) or present but almost entirely 

 hidden under the pronotum ( 9 ) . Pronotal median 

 carina strongly arcuate and sublamellate (much as in 



Nomotettix) proavus n. sp. 



A A. — Lateral lobes of the pronotum with usual bisinuate caudal 

 margin. Tegmina always present and entirely exposed. 

 Pronotal median carina not strongly arcuate or sublamel- 

 late. 

 B. — Form more slender. Dorsum of pronotum thickly and 

 finely granuloso-tuberculate and (occasionally) weakly 

 rugose, without distinct strumose rugae. Median 

 carina of pronotum fine, more distinct from the 

 dorsal surface of the pronotum. Caudal femora 

 with ridges of dorso-lateral face and external pagina 



less strumose femoratus (Scudder) . 



BB. — Form more robust. Dorsum of pronotum with elevato- 

 strumose ridges and "bosses," particularly between 



30 Wissensch. Ergeb. Deutsch. Zent.-Afr.-Exp., 1907-1908, V, p. 66, (1914). 



