TETTIGONIA. 235 
TETTIGONIA. 
Tetigonia, Geoffroy, Hist. abrég. des Ins. i. p. 429 (1764). 
Tettigonia, Fabricius, Gen. Ins. p. 173 (1776) ; Signoret, Ann. Soc. Ent. Fr. 18538, p. 14. 
This genus contains a very large number of species, many of which are among the 
most highly coloured and conspicuous of all insects; they have for the most part a 
facies of their own, but it is hard to define the characters with any certainty. The 
Tettigonie may be, as a rule, distinguished from their allies by the smooth and more 
or less rounded anterior tibize, which are rarely flattened or sulcate, and by the absence 
in most of the species of the smooth projections at the sides of the head in front of the 
eyes, these being very conspicuous in Aulacizes, &c. It is possible that the genus may 
at some future time be divided, but it seems impossible to do this satisfactorily in the 
present state of our knowledge. The shape of the head is very variable, and on this 
character two or three groups might be separated off; but intermediate forms would 
render these very doubtful, and the same might be said if other characters were adopted. 
I have already alluded to the unsatisfactory nature of Signoret’s classification of the 
whole group, and of Stal’s dichotomous tables. 
1. Tettigonia burmeisteri. 
Dilobopterus burmeisteri, Sign. Rev. et Mag. Zool. 1850, p. 286, t. 4. fig. 5°. 
Tettigonia burmeisteri, Sign. Ann. Soc. Ent. Fr. 1853, p. 28, t. 2. fig. 3’. 
Hab. Mexico! 2. 
This appears to be the only Central-American species belonging to Signoret’s first 
group of the genus Tettigonia ; he at first classed the insects belonging to it under a 
different name, Dilobopterus, which ought almost certainly to be retained. It is 
distinguished by a considerable dilatation of the cubital or claval portion of the 
wing *. I have not seen a specimen, but it appears to be rather a small insect 
(length 8 millim.), with dark head and pronotum, and light yellow tegmina, the apical 
third of the latter being subhyaline and smoky. 
2. Tettigonia ruficeps. 
Tettigonia ruficeps, Walk. List of Homopt. Ins., Suppl. p. 1961; Stal, Stett. ent. Zeit. xxv. 
p- 73°. | 
Hab. Mexico 2, Teapa in Tabasco (H. H, Smith); Guatemaua (Deby 1), San Juan in 
Vera Paz (Champion). 
The type-form has two white bands only on the tegmina. 
* Signoret calls the corium and clavus of the tegmina the radial and cubital portions respectively, and 
applies the same terms to the wings. 
*302 
