III. A Revision of the Genus Diplatys, Serv. (Dermaptera) 
By Matcoitm Borr, D.Sc., F.LS., F.Z.S., F.ES. 
[Read April 6th, 1910.] 
Prares VIL. VEIT. 
In working out the Dermaptera for the “ Fauna of British 
India” series, I was surprised at the number of undescribed 
species of Diplatys which came to hand. 
Six species, including African and American, were in- 
cluded by de Bormans in his monograph of the Dermaptera 
in 1900, yet in India alone we have now double that 
number, of which ten were described by myself, seven of 
them in the Indian monograph. 
A considerable number from other parts of the world 
rendered necessary a thorough revision of the genus. The 
synonymy has now been to a great extent cleared up, and 
there are no less than 33 species already known to science, 
including those first described in these pages. 
In 19042 I tentatively proposed a first attempt at a 
classification based on structural characters, and I have 
found this quite serviceable when elaborated to receive 
the recently discovered species. 
It is quite certain that there remain a very great many 
new forms yet to be discovered, and very probably the 
number of described species will be doubled within the 
next few years. 
Exceedingly valuable characters are afforded by the 
subanal plate, or penultimate ventral segment. 
This may be entire, emarginate, or more or less lobed. 
The latter is the rarer shape: there is a small rectangular 
lobe in D. angustatus, and in D. nigriceps there is a small 
obtuse convexity. 
In D. conradti and D. bormansi there is a small round 
emargination, but the outline is more complex in JD. 
gerstaeckeri, D. ernesti, D. flavicollis, and D. siva; in the latter 
there are two round emarginations, with a smaller obtuse 
emargination between them, so that there projects a trans- 
verse, sinuate lobe between the two deep incisions. In 
TRANS. ENT. SOC. LOND. 1911.—PARTI. (MAY) 
