al 
22 Dr. Malcolm Burr’s Revision of the Genus Diplatys. 
D. gerstaeckert there are two emarginations leaving an 
acute triangle between them; in D. ernesti the general 
form is the same, but the triangular lobe is more obtuse. 
In D. flavicollis there is a sharp incision forming two 
acute lobes. 
Where the subanal plate is entire, the posterior margin 
may be gently sinuate or straight, the sides convex or 
parallel, or the whole plate more or less rectangular or 
rounded. 
In D. macrocephalus it is very broad, subquadrate, the 
posterior margin subsinuate, the exterior angles rounded. 
In D. gladiator the outline is similar, and in D. falcatus 
and D. lefroyi; in all these the sides are convex, the 
posterior margin being almost straight in the former, and 
narrower and subsinuate in the latter. 
In the group with non-emarginate subanal plate, we 
find D. bicolor, D. vosseleri, D. griffithsi, and D. greeni 
with the posterior margin gently sinuate ; the remaining 
species, with non-sinuate, entire subanal plate, fall into 
two groups; the first has the last dorsal segment non- 
inflated: in this group we have D. jacobsont and D. 
annandalei, both Oriental species, with the subanal plate 
rectangular; if is more or less rounded at the sides and 
angles in D. rufescens, D. fletchert, and D. fella. 
The last dorsal segment is inflated m D. liberatus, D. 
raffrayi, and D. aethiops. 
In the genus Diplatys, we find that a grouping of the 
species according to the form of the last sclerites and of 
the forceps gives results agreeing fairly well with the 
geographical distribution of the species. At the same 
time, the outline of the pronotum affords useful features, 
as also the structure of the head. 
We find three distinct types of head. In one type the 
three areas with which the dorsal aspect is divided by the 
transverse and median sutures are not strongly differ- 
entiated from each other; the frons is not specially tumid, 
and the right and left portions of the occiput are not 
specially depressed, nor are they furnished with postocular 
keels running from the inner margin of the eyes to the 
extero-posterior angles of the head; the sutures are 
well marked. This may be called the normal type of 
head, as it shows the minimum deviation from the general 
type of Dermapterous head. We find this normal type of 
head in D. glacwator and D. bicolor. 
