AULACIZES. 215 
Tettigonia are as follow :—“ Head prolonged in a cone in front of the eyes, with a 
short, longitudinal, impressed furrow on the vertex.” Its range is, however, consider- 
ably widened by Stal, and at present Awlacizes is taken as including a considerable 
number of species which have the underside of the head convex and gibbous, or very 
obtusely angled beneath, and the pronotum slightly narrowed in front and never 
constricted behind the anterior margin, so that the latter appears broader than the 
posterior margin, as in Phera and Oncometopia. The tibie are usually more or less 
plainly sulcate, but sometimes the groove is very indistinct, and the insects do not 
differ much as regards this character from Tettigonia; in these cases, however, the 
slight projection before the eyes is very distinct, and the head is produced and 
furrowed. 
1. Aulacizes mutans. (Tab. XIII. fig. 12.) 
Tettigonia mutans, Sign. Ann. Soc. Ent. Fr. 1855, p. 228, t. 12. fig. 3°. 
_ Aulacizes mutans, Stal, Stett. ent. Zeit. xxv. p. 81’. 
Proconia consistens, Walk. List of Homopt. Ins., Suppl. p. 226 (1858) °*. 
Hab. Mexico 1? (Sallé?, in Mus. Brit. ; Mus. Vind. Ces. ; Mus. Holm.), San Marcos 
(Bilimek, in Mus. Vind. Ces.), Jalapa (M. Trujillo), Tierra Colorada in Guerrero, 
‘Atoyac in Vera Cruz (H. H. Smith) ; Guatemata, San Gerdénimo (Champion). 
A specimen from Mexico is figured. 
2. Aulacizes piperata, sp.n. (Tab. XIII. fig. 13.) 
Robusta, fusca; capite testaceo, basi castaned; metopidio et vertice ad medium fuscis; oculis vix prominulis ; 
pronoto castaneo albido-irrorato ; tegminibus testaceis vel fusco-testaceis, albidis parvis maculis sat sparsim 
irroratis, apicibus hyalinis ; abdomine supra nigro; corpore subtus et pedibus dilute testaceis. 
A comparatively broad and robust species, with the vertex of the head not strongly produced and rounded ; 
eyes only slightly prominent; pronotum light castaneous, with a number of small whitish-testaceous 
dashes and spots, which are also scattered more or less sparsely over the tegmina, the ground-colour of 
which is testaceous or fusco-testaceous ; before the apex of the tegmina, which is hyaline, there is a row 
of these spots; upperside of the abdomen black, the underside and legs testaceous. 
Long. 11-12 millim.; lat. ad hum. 4~43 millim. 
Hab. Mexico, Xucumanatlan, Amula, and Omilteme in Guerrero 6000-8000 feet 
(H. H. Smith). 
In our collection there is also a specimen from Purula, Vera Paz (Champion), which 
may be an unspotted variety of this species. 
An example from Xucumanatlan is figured. 
In many of the Tettigoniide the colour of the upperside of the abdomen is variable, 
being sometimes black and sometimes red in different specimens of the same species. 
The tegmina are very often subhyaline, but they appear to be of an entirely different 
colour when closed and when opened—in the present species when closed they are dark 
