: 292 HEMIPTERA-HOMOPTERA. 
long, triangular, with the eyes forming part of the triangle, usually with three or four very narrow 
longitudinal testaceous lines, but sometimes with a considerable part of the upper surface testaceous ; 
ocelli set well forward on the vertex; forehead yellowish-white; pronotum shorter than the head, 
longitudinally marked with dark and lighter brown stripes, often indistinct ; scutellum large, conspicuous, 
yellowish-white, with the basal angles broadly infuscate ; tegmina long, darker on the margins and at the 
apex, with a narrow, elongate, yellowish-white patch behind the middle ; wings fuscous; abdomen black 
or fuscous ; sterna and legs yellowish-white. 
Long. 5 millim.; lat. 1-13 millim. « 
Hab. Mzxico, Omilteme, Chilpancingo, and Xucumanatlan in Guerrero, 4000 to 8000 
feet (H. H. Smith). 
Var. immaculata, n. (Tab. XIX. fig. 30.) 
Minor, paullo angustior, nigro-fusca, immaculata ; capite paullo magis producto. 
Smaller and narrower than the type-form ; upper surface unicolorous fuscous-black, with at most one or two 
very faint testaceous lines on the head ; head a little more sharply produced. 
Long. 43 millim.; lat. 1 millim. 
Hab. Mexico, Amula in Guerrero, Cuernavaca in Morelos, Teapa in Tabasco 
(H. H. Smith). 
T. angustula has not the appearance of a true Tettigonia, though it is closely allied 
to T. variegata and T. nasuta: these three, together with 7. subflava, Sign. (from 
Venezuela), might perhaps with advantage be placed in a separate genus (vide Signoret, 
Ann. Soc. Ent. Fr. 1854, p. 725); but, considering the numerous transitional species in 
Tettigonia, it is better to retain them in it for the present. 
The variety may prove to be distinct. We figure a specimen of the type-form from 
milteme and one of the var. ¢mmaculata trom Amula. 
I have already alluded (anted, pp. 207, 235) to the impossibility of making any 
satisfactory subdivision of this very large genus: Signoret has gone further than I have 
done, and includes under it the species which are regarded above as belonging to the 
genera Diestostemma, Aulacizes, Oncometopia, &c.; Stal (Kongl. Svensk. Vet.-Ak. 
Handl. Band 8, no. 1, p. 70) attempts to tabulate twenty-seven species only of the 
genus Tettigonia proper, and in dealing with this small number has to fall back on 
differences in colour and other slight and comparative characters, which are quite 
useless for the purposes of determination. 
