18 Transactions of the Society. 



exactly with those of Ancistrog aster hiolleyi Bor. It will be very 

 interesting to examine a good series of Ancistrogastrine genitalia, 

 and to see whether Tristanella. tuherculata is an exceptional or a 

 typical form. 



It is worth noting that the proparameres are very narrow, 

 tiarrower than the metaparameres, which project at the hinge. 



Subfamily Neolobophorin^. 



It will be interesting to see whether the genitalia of the 

 flightless Neotropical genus Neolohophora agree at all with those 

 of the flightless Ethiopian Arcliidux, which so closely resembles it 

 in external features. Archidux adolji Burr may possibly require 

 separation from Neololopliora. 



The metaparameres are rather short, about twice as long as 

 broad, narrow at the base, widening to a maximum before the 

 apex, and then reduced, by symmetrical narrowing on each side, to 

 a blunt point. This is a different form from that seen in the 

 Forficulinie and Opisthocosmiinx, where the metaparameres are 

 rarely or never symmetrical about a median axis (PI. IV, fig. 11). 



The virga is sinuate, about three times as long as the meta- 

 parameres, entering the vesicle without angle. The latter is feebly 

 dilated and furnislied with a narrow chitinous pLite on its upper 

 end, where there is a large circular mouth, the horn apparently 

 being the handle of a chitin-plate in the form of a double-headed 

 pick, with the points at the base of the vesicle. 



In the preputial sac there is a large denticulate area. 



Subfamily Diaperasticin^. 



This group, undoubtedly allied to the Forficulinx, is well 

 characterized by the peculiar sexually dimorphic structure of the 

 head capsule described by Zacher (D. Ent. Zeit. 1911, p, 145). 

 The genitalia chiefly differ in having the prseputial sac strongly 

 denticulate. The parameres resemble those of Forficula and the 

 allied genera, but are remarkable for their narrowness. The virga 

 enters the vesicle at a very obtuse angle in D. erythrocephakis 

 Oliv. (PL IV, fig. 12), but almost at a right angle in D. sansibaricus 

 Karsch (PI. IV, fig. 10). These are probably the only two good 

 species of the group, as in my opinion D. mackinderi Burr is but 

 a variant of the latter, and I), cagnii Bor., and D. honchampsi Burr, 

 are variants of the former species. 



Note. — As Captain Burr is with H.M. Forces somewhere in the East, and has 

 been unable to correct the revise of this part of his paper, it has been submitted to 

 Mr. Hopkinson, for whose careful attention to it the thanks of the Society are due. 



