McNeill — revision of the truxalin^ of north America. 257 



XXIV. LIGUROTETTIX, n. gen. Fig. 24. 



Scutellum of the vertex considerably declined, narrower than the 

 short diameter of the eye, elliptical and sulcate throughout, with the 

 boundary walls high raised lines which are continued backward to a 

 point opposite the middle of the eyes. The lateral foveolse are visible 

 from above, deeply impressed, and trapezoidal in shape. The frontal 

 costa is not sulcate even at the ocellus. The antennae are short, fili- 

 form, and slender. The eyes are prominent, and the occiput is much 

 (male) or somewhat (female) higher than the disk of the pronotum. 

 The disk of the pronotum is moderately rounded, more decidedly on 

 the prozone. The median carina is slight but distinct, cut near the 

 middle by the last transverse sulcus. The lateral carinse are wanting, 

 even on the metazone. The lateral lobes of the pronotum are a little 

 higher than long, with the anterior and posterior borders both sub- 

 perpendicular, and both of the lower angles obtuse and rounded. The 

 prosternum is furnished with a large pyramidal spine. The mesoster- 

 nal lobes are wider than long in the female; about equally as wide as 

 long in the male. The metasternal lobes are separated by a narrow 

 space in the female, united behind in the male. The tegmina exceed 

 the abdomen in length, the intercalary vein is distinct, and the plicate 

 is soon united with the dividing vein. The mediastine vein is well 

 developed in the female, and extends to a point beyond the middle 

 of the wing. In this sex also the scapular area is filled with a single 

 series of oblique cross-veins, but is not hyaline. In the male the me- 

 diastine vein is very much abbreviated and the scapular area greatly 

 expanded so that it occupies one-third of the width of the tegmina 

 and causes the anterior margin of the wing to be much expanded in 

 the second and third fourths. It is hyaline and filled with a series of 

 strong, curved, oblique veins forming a very efficient musical organ. 

 Behind this musical organ the anterior radial vein is greatly thickened. 

 In both sexes the longitudinal veins are distinct, and the cross veins 

 are few and weak comparatively. The wings are more than twice as 

 long as wide, hyaline, with a slight infuscation at the tip, and the veins 

 black. The hind femora are moderately slender with distinct fuscous 

 bands on the upper surface. The valves of the ovipositor of the fe- 

 male are moderately exerted, and the lower pair are furnished with a 

 strong lateral tooth. 



This genus is a curious composite form with affinities with CEdipodi- 

 ncB and Acridince, as well as Truxalince. It is not closely related to 



