194 DERMAPTERA AND ORTHOPTERA FROM SINALOA, MEXICO 



with two pairs of spines, of which the outer are the longer; or 

 with outer pair developed into roughly rounded lobes; or with 

 these outer lobes connected with the inner spines by a jagged 

 ridge. Abdominal tergites unspecialized; or with first and 

 fourth with a small, flattened lamellate projection meso-caudad; 

 or with median segment and second and third tergites with 

 such a projection, those of the first and fourth being much 

 larger; or with sixth tergite with latero-caudal portion lamellate 

 and produced in narrow, horizontal lobes, rounded distad. 

 Median femora simple; or with ventro-internal margin bearing 

 a minute lobe or a low flange proximad and with dorso-internal 

 margin bearing one or two very minute lobes which are usually 

 triangular; or with ventro-internal margin bearing a rather 

 large, foliaceous lobe which is suddenly deeply emarginate 

 toward its caudal portion. Caudal femora usually simple, in 

 a few specimens showing to different degrees a weak, rounded 

 flange proximad on each ventral margin, of which that of the 

 caudal margin is the stronger. Median and caudal tibiae 

 simple; or bearing a small, rounded lobe on the dorso-external 

 margin proximad. Genicular areas of median and caudal 

 femora simple or la.aiellato-bilobate produced, due to a lamella- 

 tion of the genicular angle and the femoral margin below. Meta- 

 tarsi simple, or with those of the cephalic limbs with dorsal 

 margin sub-lamellate, forming an obtuse-angulate outline; or 

 with all of that type. 



In all of the females the dorsal surface, except that of the 

 abdomen, is heavily tuberculate, the mesonotum and meta- 

 notum are longitudinally tricarinate. These features, the 

 genitalia, proportions and, to a less degree, the size, are ap- 

 parently alone dependable to serve in distinguishing females of 

 this species. Westwood (lescri])ed a female w'th an even 

 greater complexity of lobes and lamellae, while Saussurc has 

 diagnosed a female more nearly resembling somc^ of th(^ present 

 sei'ics.^'' 



The male of this species agrees closely with that of B. jolts - 

 censis Rehn,''^ differing as follows. Size larger, form propor- 

 tionately mon; elongate. Heveutli and (Mghlli tergites evenly 



<' Miss. Sci. Mex., Ucch. Zool., vi, p. 175, (1S70). 



*•* Comparison is nmde with the type, Acad. Nat. Sci. Pliila., no. .5147. 



