242 STUDIES IN AMERICAN TETTIGONIIDAE (oRTHOPTERA) 



Conocephalus vitticoUis (Blanchard) (PI. XXII, fig. 2; XXIII, 3 and 4; 



XXIV, 2.) 

 1851. Locusta vitticoUis Blanchard, in Gay, Hist, fisica polit. Chile, ZooL, vi, p. 



46, Orth. pi. II, figs. 5, a and b. [Coquimbo Province, Chile.] 



This species, which replaces C. longipes in Chile, is a closely 

 related form, but readily separable by the characters given under 

 that species. 



Vertex not as much produced as in longi/pes and accordingly 

 slightly less ascending. Fastigium of vertex over two-thirds 

 width of proximal antennal joint, narrowing with a distinct 

 concavity to facial suture, when seen from front about one and two- 

 thirds times as deep as greatest width. Eyes moderately large. 

 Lateral lobes of pronotum similar to those of longipes excepting 

 that they are distinctly broader and the ventro-cephalic angle is 

 noticeable as a very broadly rounded obtuse-angulation, convex 

 callosity exceedingly broad. Tegmina proportionately shorter 

 than in longipes, becoming extremely slender distad toward the 

 sharply rounded apex; tympanal field of males as in longipes. 

 Male cerci much as in longipes but proportionately shorter and 

 more compact, with portion overhanging tooth thicker and ex- 

 tending a full two-thirds of the distance to the base of the cercus. 

 No approach toward brachypterism is apparent though the 

 measurements^^ show decided variability due to a general greater 

 or lesser size development^^; the proportionate tegminal length 

 when compared with that of longipes is distinctly less than in that 

 species. The caudal femora vary similarly in length, cT 10.7- 

 14.3, 9 12.9-15.6 mm.; the genicular lobes are normally bi- 

 spinose; the genicular areas are not darkened ^^; the ventral mar- 

 gins are unarmed. The dorsum of the abdomen is frequently 

 infuscated in the present species and in such material the narrow 

 lateral yellowish lines, found weakly indicated in longipes, are 

 very striking. 



33 Vide page 237. 



3* The large series from El Olivar, Chile, averages very decidedly larger than 

 any of the other specimens before us. A warmer and more humid environ- 

 ment accompanied by more; luxuriant vegc^tation ap])arently ])rodu('('s a de- 

 cided size increase in many s])('cies of Orthoptera. 



35 In some, more richly colored specimens of this and other species, the tissue 

 in drying is found to settle to a certain extent in th(>se areas, and careful exam- 

 ination is sometimes necessary to detect the fact that such (iarkeuing is due 

 to discoloration. 



