176 ORTHOPTEROUS GROUP INSARAE 



ferences are given as diagnostic. These are, in addition to the 

 form of the stridulating field, the broader marginal field and more 

 abruptly arcuate costal margin of the tegmina, the decidedly 

 crenulate margins of the abdominal segments, the slenderer cerci 

 and more elongate limbs. 



Type. — cf; Environs of Guadalajara, Jalisco, Mexico. 1901. 

 (M. Diguet.) [Amer. Mus. Nat. Hist.] 



Description of Type. — The following description is largely comparative 

 with A. brevicauda and also, on account of the character of the material, re- 

 stricted to features which appear to be unaffected by the condition of the 

 specimens. Size slightly larger than A. breicauda. Fastigium more in- 

 flated, higher, the margins regularly converging cephalad and arcuate when 

 seen from the side, apex depressed, sulcate; eyes prominent, ovoid, the apex 

 dorsad, the greatest width contained one and one-half times in the depth, 

 the latter very slightly greater than the depth of the infra-ocular portion of 

 the genae. Pronotum sellate, the dorsum considerably ascending caudad, 

 cephalic margin of disk very broadly angulato-emarginate, caudal margin 

 very roundly obtuse-angulate, the immediate angle emarginato-truncate; 

 transverse sulcus broadly V-shaped on the disk, deeply impressed on the 

 dorsal section of the lateral lobes; lateral lobes with the greatest depth about 

 two-thirds the greatest dorsal length, cephalic margin oblique subsinuate, 

 ventro-cephalic angle sub-rectangulate, ventral margin subtruncate, ven- 

 tro-caudal angle roundly obtuse, caudal margin moderately oblique, more 

 vertical than in the other species, arcuato-truncate, humeral sinus rotundato- 

 rectangulate. Tegmina quite elongate, about seven times as long as the pro- 

 notal disk, the width at the distal fourth about one-ninth the length of the 

 same; marginal field very broad, its greatest breadth very decidedly proxi- . 

 mad of the middle of the field, thence tapering distad, costal margin rather 

 abruptly arcuate to the blunted apex; discoidal vein with three rami; stridu- 

 lating field with its greatest width (to apex of stridulating vein) subequal 

 to the length of the field, free margin excessively pi'oduced at the apex of the 

 stridulating vein into a peg-like process, which is longer from the ad- 

 jacent angle of the speculum than the remainder of the stridulating vein, 

 remainder of the free margin much as in brevicauda but less arcuate between 

 the two emarginations, stridulating vein nearly transverse, faintly sinuate, 

 speculum subtrigonal with its apex proximad, the greatest width more than 

 the direct greatest length. Abdomen with a decided proximo-distal process 

 similar in character to that of brevicauda, margins of dorsal segments strong- 

 ly and regulaily crenulate; subgenital plate strongly transverse, narrow, 

 margin arcuate; cerci as in brevicauda but slightly slenderer and less arcuate 

 distad; subgenital plate as in brevicauda but slightly broader distad, margin 

 arcuato-angulate emarginate, lateral angles mere knobs and not styliform 

 processes. Limbs very elongate; femorg, with the dorsal genicular section 

 not spiniform produced, genicular lobes of the cephalic and median femora 



