The Dermatoptera. 287 



appears, but B. africana is much more hairy than 

 B. impressicollis. 



The male of B. impressicollis has the last abdominal 

 segment very large and round, and smooth, armed at 

 each corner of the posterior margin with a kind of long 

 and blunt tongue-shaped tooth ; the forceps are very 

 stout and powerful, the branches strongly thickened and 

 dilated at the base ; the inner margin is strongly denti- 

 culated, and the left branch is incurved more strongly 

 than the right, as in Anisolahis maritima\ each branch 

 is armed, near the base, on the upper margin, with a 

 strong, sharp, vertical tooth. The antennae are charac- 

 teristic of Verhoeff's family Karschiellida^, to which 

 this genus is assigned ; in B. impressicollis the first seg- 

 ment is very large and dilated, the second very small, 

 the third a little shorter than the first ; the nine follow- 

 ing segments are dark, very small, globose; there appear 

 to be at least twenty-five segments, of which the last 

 nine or ten are more slender and conical ; the basal half 

 of the antennas are noticeably thick and strong. In the 

 British Museum there is a single male of a third species, 

 from the Transvaal, which will be described elsewhere. 



It is to be noted that according to Verhoeff, the nymphs 

 oi Boi^mansia africana have segmented cerci, as in Diplatys ; 

 the cerci have fifteen or sixteen segments, of which the 

 basal one forms the forceps of the imago. 



TOMOPYGIA, nov. gen. 



Antennse segmentis 23 vel plus instructse ; elytra perfecte expli- 

 cata ; al* deficientes ; scutellum triangulare vel vix perspicuuiii ; 

 pedes longi, graciles, feiiioribus baud incrassatis, quam tibiae 

 longioribiis ; segmentum ultimnm abdominale magnum, latum, 

 quadratum ; pygidium semilunare, verticale ; forcipis bracchia ^ 

 sat valida, basi remota, incurva, paullo ante apicem attingentia, 

 recta, contigua, intus dentata, apice decussata. 



Typus generis : Cylindrogaster ahnormis, Borm. 



This genus was originally erected in manuscript by my 

 friend M. de Bormans, for the remarkable earwig described 

 by him in 1883 as a very distinct form of Cylinclrogaster ; 

 in his monograph (Tierreich, Forf, p. 23, 1900) he ranges 

 it in Pygidicrana. The collection of the Paris Museum 

 contains a fragment, only the anterior half of the body, 

 but this is so characteristic that I hardly hesitate to 



TRANS. ENT. SOC. LOND. 1904. — PART II. (JUNE) 19 



