94 [September, 



the same work, aiul where the genitalia (which he himself pointa to 

 as a leading generic character), as well as the shape of the head, ought 

 to have indicated their true position. 



In 1858, Kirschbaum published his " Athysanus-Arten," con- 

 sisting of eighteen species, eleven of which he described as new ; but 

 two of these, diminutus and sulphureus, being only (according to Fieber) 

 respectively interstitialis, Germ., and impictlfrons, Boh., the number 

 is reduced to sixteen. Still further, three other species are referable 

 to as many other genera, viz., hrevis to Gonlagnathus, Fieb., ventralis 

 to GraphocrcBrus, Thoms., and stylatus to Doratura, J. Sahib. ; so that 

 in all there remain but thirteen representatives of the genus. This 

 condition of matters remained pretty much in the same state until 

 1868, when Kirschbaum's " Cicadinen der Gregend von Wiesbaden u. 

 Frankfurt " appeared, in which are recorded no fewer than thirty-nine 

 species. Five of these I have already referred to other genera, and of 

 the remainder nineteen figure as his own. Here Fieber again steps 

 in and extracts eleven others, for the following reasons, viz., lacteiner- 

 vis which he consigns to his genus Allygus ; proceps, MJinhii, convexus, 

 sejungendus, SchencJcii, incisus, palUdior, and anomalus, species resting 

 for the most part on the authority of single specimens (some of one 

 sex and some of the other) in the author's collection, and which he 

 refused Fieber a sight of after various applications (see Yerh. z.-b. 

 Wien, pp. 27 — 33 [1872]) ; two others, confusus and validinervis, 

 which Fieber knew, he refers to sordidus and grisescens, Zett. As- 

 suming this to be the true state of things, then Kirschbaum has really 

 added eight good species to the genus. But there still remain three 

 other species to be dealt with before the list is thoroughly purged ; 

 these are Imeatus and PregssJeri both belonging to the genus Thaiimo- 

 tettix, Scott (Fieb.), and homophyJa to that of Doratura, J. Sahib. 

 After all this disseveratiou, there are twenty species left, of which we 

 have ten, and, in addition, five others unknown to Kirschbaum. Many 

 of the species are only met with in the brachypterous state, and some 

 of them in great abundance. 



To facilitate the recognition of the species, I have divided them 

 into three apparently natural sections, as follows : 



Section A. — Distance between the inner margin of the eyes at the 

 base of the head not t .vice as great as the length down the 

 centre ; anterior margin very slightly rounded, angle somewhat 

 acute. 



Section B. — Distance between the inner margin of the eyes at the 

 base of the head twice as great as the length down the centre. 



