122 ORTHOPTEEOUS GROUP INSARAE 



siderable superficial resemblance to A. carita in the bullation of 

 the male pronotum. The extremes of the two races are quite 

 different in general appearance, but an analysis of the differences 

 and the examination of series reduces the degree of real difference. 

 True gracilipes in general differs from the race constricta in having 

 the head broader, the fastigium broader with the margins of the 

 same more decidedly arcuato-divergent cauclad, the pronotum more 

 inflated and sub-buUate, the disk (particularly in the male) broader 

 in proportion to the length, the caudal margin of the same roundly 

 rectangulate, the process of the proximo-dorsal abdominal segment 

 of male more elevated and subrecurved, generally very high and 

 bulbous distad, the proportionately shorter, and in the male broader, 

 tegmina and the limbs slightly shorter. 



Type. — cf ; Southern Colorado. 1869. [United States National 

 Museum.] Dried from alcohol and colorless. 



Description of Male.— As the type is in such poor condition we hero de- 

 scribe a male from Raton, New Mexico, August 26, (Cockerell), [United 

 States National Museum]. 



.Size small; form very elongate, subcompressed. Head relatively broad, 

 the greatest width immediately ventrad of the eyes contained slightly less 

 than one and one-half times in the greatest depth of the head; occiput sub- 

 bullate; fastigium rather broad proximad, elongate trigonal, strongly nar- 

 rowing distad, lateral margins well elevated, arcuato-sublamellate, a de- 

 cided medio-longitudinal sulcus present, apex of fastigium low, narrowly 

 subtruncate and in contact with the fastigium of the face; eyes quite promi- 

 nent, elliptical in outline, their length subequal to that of the infra-ocular 

 portion of the genae. Pronotum moderately inflated, sub-bullate across 

 the lateral lobes, sellate, the dorsal outline weakly concave when seen from 

 the side; disk considerably expanded caudad, the greatest width there ap- 

 preciably more than half the pronotal length; cephalic margin of disk very 

 shallowly and imperfectly obtuse-angulate emarginate, caudal margin of 

 disk roundly obtuse-angulate, the immediate angle completely rounded, 

 lateral margins of disk completely rounding into the lateral lobes; trans- 

 verse sulcus forming a broad obomegoid figure mesad on the disk; lat- 

 eral lobes with the greatest depth of the same two-thirds of the greatest 

 length of the lobes, cephalic margin of the lobes sinuato-emarginate, ventro- 

 cephalic angle rotundato-rectangulate, ventral margin sigmoid, i.e., con- 

 cavo-emarginate and arcuate caudad, ventro-caudal angle broadly rounded, 

 caudal margin obliquely truncate, humeral sinus roundly obtuse-angulate, 

 rather shallow, surface of the lobes with a considerable area along the caudal 

 margin calloso-inflated. Tegmina about one and one-half times the length 

 of the body, appreciably narrower at the proximal third than at the distal 

 fourth, the width at the latter contained about seven and one-half times in 

 the length; apex narrowly rounded; lobate marginal field very slightly long- 

 er than the disk of the pronotum; stridulating field distinctly shorter than 



