166 DERMAPTERA AND ORTHOPTERA FROM SINALOA, MEXICO 



pale lateral margins not invading the move extensive dark area 

 latero-caudad. In the male sex the supra-anal plate is sub- 

 chitinous mesad instead of meso-distad, roundly and evenly 

 triangularly produced, with hairs and stout spines along the 

 free margin; the specialization at the bases of the cerci is dis- 

 tinctive, while the styles are smaller, more slender and less 

 heavily armed. In the female the supra-anal plate is triangu- 

 larly produced with apex bluntly rounded. 



Type. — cf ; Venvidio, Sinaloa, Mexico. September 2, 1918. 

 (J. A. Kusche.) [Hebard Collection, Type no. 759.] 



Size small, form moderately slender, much as in toltcca. Interocular space 

 slightly over half that between the antennal sockets. Ocelli large and dis- 

 tinct but with flattened surfaces of ocellar areas forming a very blunt angle 

 with the interocellar area. Maxillary palpi short, fifth and third joints of 

 equal length, appreciably longer than fourth. Antennae, palpi, limbs and 

 ventral surface decidedly hairy, particularly the fifth joint of the maxillary 

 palpi. Latero-caudal sulci of pronotal disk distinct and broad. Tegmina 

 and wings extending well beyond cereal apices. Wings with a moderately 

 well developed intercalated triangle. Dorsal surface of abdomen specialized 

 as is characteristic of the genus. Eighth tergite with caudal margin rather 

 strongly concave. Supra-anal plate subchitinous in median section, tri- 

 angularly produced between cerci with lateral margins broadly convex and 

 apex rather sharply rounded, free margin well supplied with elongate hairs 

 but entirely lacking minute spines. From inside the base of each cercus a 

 large horn-like chitinous process is directed meso-caudad, the sinistral gently 

 curved dorsad, the dextral heavier and longer, gently curved mesad and then 

 very weakly ventrad.^^ Subgenital plate large, extending caudad bej^ond 

 apex of supra-anal plate, convex with sides gradually reflexed. but broadly 

 and shallowly concave before the styles. Styles situated slightly sinistrad of 

 the median point, separated by a distance equal to the width of one of them, 

 moderately stout, both armed in distal half of dorsal surface with a few 

 minute, stout spines; sinistral style very weakly curved, tapering to its blunt 

 apex, nearly four times as long as its proximal width; dextral style slightly 

 longer, four times as long as its basal width, its distal portion very slightly 

 thickened and bent weakly ventrad. Limbs, their armament, i)ulvilli, tarsal 

 claws and arolia as characteristic of the genus. 



Allotype. — 9 ; same data as type. [Hebard Collection.] 



Verysimilar to male, but showing the following differences. Interocular space 

 three-quarters that between the antennal sockets. Dorsal surface of abd( men 

 unsiiecialized. Organs of flight slightly more amj)le. Supra-anal plate tri- 

 angularly produced Ix'twecn cerci, with lateral margins s('ar('(>ly convex and 

 apex rather sliarply nninded, though not as sliari)ly as in male. Paired 



'^ These processes of the con(X!aled genitalia appear lo be normally visible 

 from above, lying outside the sui)ra-anal plate. 



