172 DERMAPTERA AND ORTHOPTERA FROM SINALOA, MEXICO 



dentate. Supra-anal plate roundly produced between cereal bases, showing 

 a weakly triangular tendency, length three-quarters width between cerci. 

 Cerci more compact than in flying species, with dorsal surface weakly convex. 

 Subgenital plate and styles of the general type characteristic of the genus; 

 sinistral style situated proximad, five times as long as greatest proximal 

 width, curving along margin of plate, weakly tapering and flattening at ai)ex; 

 dextral style situated distad, heavier and shorter than sinistral style, similar 

 but enlarging in proximal fifth, less than four times as long as greatest width. 

 Ventro-cephalic margin of cephalic femora armed with (nine to thirteen) 

 small but stout spines, terminating in three spines, elongate in increasing 

 ratio distad; other ventral femoral margins well supplied with heavy spines, 

 those of the caudal margins much more elongate than those of the cephalic 

 margins. Metatarsus unarmed ventrad, four proximal tarsal joints supplied 

 with very large pulvilli. Large arolia present between the stout, asym- 

 metrical tarsal claws. 



Allotype. — 9; same data as type, but taken June 28, 1918, 

 [Hebard Collection.] 



Agrees closely with male, but differing in thefcUowing respects. Interocular 

 space narrower, hardly one-fifth as wide as that between antennal sockets. 

 Pronotum broader, with caudal margin even more decidedly transverse, 

 Tegmina nearly as long as broad, sharply truncate distad, leaving the median 

 segment exposed. Supra-anal plate larger, minutely rectangulate emargin- 

 ate at apex. Subgenital plate large, short, unspecialized. 



General coloration shining black, tegmina showing a faint tinge of liver 

 brown. Male with fifth and sixth alidominal tergites showing a large sub- 

 marginal spot proximad on each side of vinaceous-rufous or ferruginous. 

 Eyes chestnut brown. Antennae black proximad, russet in distal portions. 

 Limbs showing a liver brcwn tinge distad, pulvilli and ventral surface of 

 arolia buffy. In the female and immature stages the dorsal surface of the 

 abdomen is unicclorous, black. In immatures the head and cerci are deep 

 bay. 



In one adult, killed before having become thoroughly hardened, tlic pro- 

 notum is liver brown darkened caudad and latero-cephalad, the legmina 

 ti'ansj)arent hays russet. 



Mca.s- arc men Is {i n. iiiilU iiiiicr.s ) 



I0xi)<)se(l Loiifitli of 



LciiKth of l>('iiglli of Widtli of Iciifitli of Width of caudal 



hody i)roiiotiini pronotimi tef?mon tegmen femur 



Tjipc 25 tJ.'J its 7.4 7.1 7.3 



Par a types, 



(5) 21..-)-2(> G.6-7.2^' y.l)-10.4-' 7.4-7.8 7-7.2 7-7.2 



9 



Alluli/pc 24.. 5 7.2 10.8 7 7.0 7.2 



■•'^ liiese measurements are for t he specinu-n noted above, wliirh iiad rec>'ii( ly 

 em(>rged when killed. It is possible that (U)nsiderabl(i pronotal shrinkage 

 might still have occurred, tiie i)r()notum being notic<'abIy larger tlum in any 

 olh^r male and more of the general form of the female and juveniles. 



