eo) 
PROCTOPHYLLODES, 4 
wide interstice from the third pair. The body is broadest at some distance in front 
of the third pair of coxee; from the third pair of legs it diminishes in size, and ends in 
two fleshy appendices, of a short conical shape. The appendices are separated by a 
deep incision ; each of them bears three bristles; the adhesive discs are situated near 
the inner margin and at the base of the anal lobes. The mandibles are short ; the 
branches of the chelz are long, slender, and curved, and when closed they touch each 
other with the points only. 
The adult female is a little larger than the male. Its abdomen terminates in a 
fleshy fork, each point of which bears a lancet-like spine underneath and ends ina 
narrow, acutely-pointed, somewhat curved blade. The apices of the first pair of 
epimera of each side touch each other in the sternal region; those of the second pair 
remain widely separated, and are, at about two-thirds of their length, angularly inflected 
and directed backward. On the side of the body, somewhat behind the middle of the 
interstice between the second and third pairs of legs, a long bristle is inserted, and 
underneath, near the third pair of coxe, stands, as in the male, a straight, lancet-like 
spine, which is usual in this genus. A little behind the middle of the ventral surface 
there is a semicircular transverse trabecula in front of the genital orifice; its branches 
are continued backward and united with the coxal circles of the fourth pair. ‘The 
mandibles are as in the male. 
In the nymph the abdomen terminates in a conical process, which by a narrow fissure 
is separated into two lobes, each lobe bearing on its outer edge a lanceolate spine 
and a long bristle on its top. 
The hexapod larva is very small, and shows, though in a rudimentary state, the anal 
appendices of the adult. 
The eggs are long, comparatively large, fusiform, transparent, and cribrated. 
Nore.—Several years have elapsed since the publication of this memoir was com- 
menced in December 1886. In the meanwhile I have become better acquainted with 
the Acarid-fauna of Europe and some other countries. The clearer insight into the 
leading features of the geographical distribution in general which I have thus 
acquired, and of which I have given a résumé in the ‘‘ Introduction,” has made 
me sceptical with regard to the validity of some of the species described in this 
work. As an excuse for the synonymical errors into which I may have fallen in 
some instances, I may be allowed to plead the many difficulties which the study of 
Acarids offers to the naturalist in a tropical country, in consequence of the extreme 
delicacy of the soft-bodied species and their great liability to rapid changes of form 
and colour. Moreover, owing to the unfortunate circumstance that I only brought 
a* 2 
