Mali Genital Armature of the Dermaptera. Part II. 543 



and E. cincticollis Gerst. It should be noted, however, that E. 

 janeirensis shows every gradation from perfect wing-development, 

 or at least perfect elytra, to brachypterism, and possibly total 

 apterousness ; apparently the same elasticity occurs in E. cincti- 

 collis. 



This group may therefore be tabulated as follows : — 



1. Antennal segments spindle-shaped ; (no 

 virga ; metaparameres broadly tri- 

 angular ; apterous ; Ethiopian) . 1. Anisoldbella Zacher. 



1, 1. Antennal segments cylindrical. 



2. Virga well-developed ; (apterous ; Neo- 

 tropical genus) 2. Heterolabis Bor. 



2, 2. Virga not developed. 



3. Abdomen 6 dilated at the apex ; 

 (apterous ; Oriental and Austra- 

 lian genus ; metaparameres ex- 

 ternally rectangular) . . 8. Mongolabis Zacher. 



3, 3. Abdomen not dilated apically ; 

 (fully-winged, with elytra rudi- 

 mentary, or apterous) . . 4. Euborellia Burr. 



Genus Anisolabella Zacher. 



This genus is well characterized. It is the only known Psalid 

 in which the antenna? have the segments spindle-shaped. The 

 metaparameres are very broad, in the form approximately of an 

 almost equilateral triangle, with curvilinear, gently convex sides, 

 and rounded angles. 



It contains a single species, A. hraueri Zacher, from North- 

 Eastern Africa. The genitalia are figured by Zacher. 



Genus Heterolabis Bor. 



Differs from Psalis in the subrectangular metaparameres. 

 Contains the single species H. brasiliensis Bor. 



Genus Mongolabis Zacher. 



In his arrangement of the Psalidm, Zacher separates the genera 

 Gelotolabis and Mongolabis from each other by the absence and 

 presence of teeth in the preputial sack, and by trifling dif- 

 ferences in the form of the parameres, and both are separated 

 from Euborellia and Gonolabis by the absence of " Chitinverdic- 

 kungen " in the preputial sack. If we carry Zacher' s system to 



