66 ORTHOPTEROUS GROUP INSARAE 



Type.— d" ; Temax, Yucatan. (Gaumer.) [Biologia Collection 

 in British Museum.] 



We here describe the single male of the present species in our 

 possession. 



Description.— d" ; Castillo, Nicaragua. February 1893. (B. Shimek.) 

 [Hebard Collection ex Bruner.] 



Size a little larger than medium for the genus, form most attenuate of 

 all the species. Head with greatest width contained about one and four- 

 fifths times in greatest depth, similar to that of /. toltcca but with eyes not 

 quite so prominent. Pronotum with dorsal length almost twice the great- 

 est (caudal) dorsal width; dorsum of pronotum sightly depressed within 

 the margins; lateral carinae of dorsum of pronotum very weak, in cephalic 

 fifth divergent in a straight line, then subparallel for an equal distance, for 

 remaining three-fifths very slightly convexo-divergent caudad; cephalic 

 margin of dorsum of pronotum straight, caudal margin of same arcuate with 

 a very slight emargination indicated mesad; lateral lobes of pronotum with 

 length decidedly greater than depth, the ventro-cephalic angle obtusely 

 rounded, the ventro-caudal angle very broadly rounded, humeral sinus deep 

 and roundly subrectangulate. Tegmina very long and very narrow, their 

 dorsal and ventral margins subparallel, these organs reaching to the distal 

 extremities of the caudal femora and rounded at the apex; marginal field 

 of tegmina very small, narrowing evenly distad from point of greatest width 

 which is proximad. Disto-dorsal segment of abdomen very broadly arcuate 

 caudad, median section showing a rounded depressed area; supra-anal 

 plate small, trigonal, with lateral margins somewhat convex. Cerci very 

 long and, beyond the base, very slender for the genus, tapering rather sharply 

 at base, then nearly uniform in diameter to apex which bears a large blunt 

 tooth, this tooth directed slightly dorsad of the curve of the shaft of the 

 cerci; subgenital plate short, lateral margins convergent distad and pro- 

 duced in non-articulate styliform appendages, cephalad from the base of 

 these appendages extend slightly divergent rounded elevations which be- 

 come obsolete about the middle of the plate, distal extremity of plate be- 

 tween the produced lateral margins obtuse-angulate produced, the sides of 

 this angle slightly concave." Cephalic and median limbs long and slender, 

 cephalic femora carinate dorso-distad for a considerably greater distance 

 than in lolteca and having the distal margin of same produced in a bluntly 

 acute-angulate tooth, genicular lobes similarly much produced but bearing 

 a small supplementary spine ;26 cephalic tibiae with proximal extremity 



25 The distal extremity of the subgenital plate varies from this type to 

 one which is truncate between the lateral non-articulate styliform append- 

 ages, as is shown in the type, this is also found to be true in /. gracillima as 

 is shown by our specimens of that species. 



2« We do not give the armament of the ventral margins of the cephalic 

 femora as we have much evidence to show that this is too variable to be of 

 any service as a character. In the present specimen the number of small 



