280 STUDIES IN AMERICAN TETTIGONIIDAE (oRTHOPTERa) 



Conocephaius truncatus (Redtenbacher) (PI. XXII, figs. 7, 17 and 22; 



XXIII, 24 and 25; XXIV, 7). 

 1901. Xiphidium truncatum Redtenbacher, Verb. k.-k. zool.-bot. Gesell. 



Wien, xli, p. 522. [Brazil] 



In general form, tegminal structure, vertex and male cerci 

 the present insect shows its close affinity to C. versicolor and C. 

 ochrotelus. In the last two characters it more closely agrees with 

 the former species; the cerci are, however, less elongate with 

 swollen portion overhanging the tooth more decided and distal 

 portion narrowing to a sharper apex. In the tegminal structure 

 close affinity is shown to ochrotelus. In coloration and unarmed 

 ventral margins of the caudal femora, it agrees with neither of 

 the above species. 



Size medium, form moderately robust. Vertex not strongly 

 but distinctly ascending, narrow, greatest width one-half that of 

 proximal antennal joint, about two and three-fourths times as 

 deep as wide, sides straight and very weakly convergent. Eyes 

 moderately large and decidedly protruding. Antennae greenish 

 with each joint weakly annulate with brown at the suture, not 

 of the extreme length found in versicolor. Lateral lobes of pro- 

 notum with cephalic margin convex to the sharply rounded ven- 

 tro-caudal angle, ventro-cephalic angle weakly defined, caudal 

 margin subsinuous, almost straight, humeral sinus absent, convex 

 callosity very narrow. Tegmina of male similar to those of 

 ochrotelus but with veinlets distinct and large tympanum con- 

 siderably more elongate, distinctly longitudinal; wings small and 

 aborted, about half as long as tegmina. Tegmina of female small 

 rounded pads, usually overlapping dorsad; wings small aborted 

 pads of nearly equal length. Male cerci with liasal third mod- 

 erately stout, mesal third distinctly swollen and decidedly pro- 

 duced above a rather long and slender ventral tooth, which is 

 straight to the sharp and decurved apex, the tooth situated 

 proximad of the middle and directed meso-proximad, distal 

 portion of cercus directed weakly outward, distinctly and evenly 

 flattened, with margins converging evenly to the acute apex. 

 Subgenital plate of male truncate between the rather short disto- 

 lateral styles. Ovipositor short and weakly but distinctly arcuate 

 dorsad. Subgenital plate of female flat with lateral margins 

 strongly and rather broadly curved upward, embracing the base 

 of the ovipositor. Caudal femora with proximal portion 



