32 PROCEEDINGS OF THE ACADEMY OF [Feb., 



species. The only information we have is a footnote to the extent 

 that ' ' Ce genre est fonde sur une espece de Buenos Aires. ' ' The next 

 use of the name is by Gigho-Tos, who placed the species in hand in 

 that genus, in spite of the sanguineous wings, which appendages were 

 stated to be hyaline by Bruner. Bruner was apparently unacquainted 

 with the paper of Giglio-Tos and erected a new genus Dichroatettix 

 for a species, which is undoubtedly the same as F. hohlsii Giglio-Tos, 

 while Fenestra was applied to three species, which therefore require 

 a new generic name, a want supplied on a jM-evious page of this paper. ^^ 

 This genus is related to the North American genera Napaia and 

 Horesidotes. It can be distinguished from the former by the less 

 expanded antennae, the strongly constricted lateral carinas of the pro- 

 notum, the subequal prozona and metazona, the distinctly angulate 

 caudal margin of the pronotum, the longer tegmina with more definite 

 venation and the very peculiar cerci. From Horesidotes (which has 

 not been examined) it appears to differ in that the occiput has no 

 distinct median carina, the caudal margin is more angulate and the 

 lateral lobes of the pronotum are deeper than long. 

 Fenestra bohlsii Giglio-Tos. 



1895. F[enestra] bohlsii Giglio-Tos, Zoolog. Jahrbucher, Syst. Abth., VIII, 



p. 807. [Paraguay.] 

 1900. Dichroatettix viridifrons Bruner, Ace. Gen. Spec. Locusts Argent., 



p. 33, figs. 9 and 10. [Cordoba and Carcarana, Argentina.] 



Cordoba, Argentina. 1 d. (Through L. Bruner, U. S. N. M.) 

 Sapucay, Paraguay. January 24, 26, February 13 and March 2- 

 21, 1905. 5 d'd^, 10 ? ? . (Foster, Hebard Coll.) 



This series shows that the green color of the face is not present in 

 some of the females, and in such as it is present the lateral lobes of 

 the pronotum are always, and generally also the dorsum, the pleura 

 and the caudal femora, except the apices, of the same color. All the 

 males examined have the face green. In some specimens the dorsum 

 of the pronotum is without the velvety black patches seen in others, 

 in fact about half the specimens are without them. Size, as exhibited 



" The name Dichroatettix might with justice be used for this genus if the un- 

 identifiabihty of the Brunnerian genus Fenestra precludes its use by GigUo-Tos. 

 As an unidentifiable name requires different treatment from a nomen nudum the 

 use of Fenestra once in such a way would by some be considered to preclude its 

 subsequent use, its existence terminating as a name when considered unidentifi- 

 able. A nomen nudum, being considered to express nothing definite, can be 

 properly used by a later author from whom it dates. An unidentifiable name, 

 on the other hand, represents something imperfectly and improperly presented 

 and should be discarded for all time. I have presented both views, the proper 

 presentation of the name by a later author and the complete elimination of the 

 name, and leave others to choose for themselves. In any case Giglio-Tos's 

 species bohlsii would stand. 



