L. Harrison 
395 
fourth article placed distally at three-quarters of the length, that of the 
fifth a little proximal of half the length. In colour, a little more than a 
third of the head on either side is dark translucent brown, leaving 
a median area yellowish white except for the narrow chitinous hind 
border of the-emargination, a curved chitinous piece in front of the 
mandibles, which may represent a labrum, the mandibles themselves, 
the oesophageal sclerite, and a faint elongated triangular plate on the 
ventral surface, for which I would propose the term gular plate in place 
of Kellogg’s occipital signature. The heavier markings of the head 
consist of two fine blackish bands running from the posterior mandibular 
articulation to the occiput, just in front of which they send inwards 
slight projections, and continuous round the temporal margins to the 
eyes; and of two short bands which, commencing just behind and 
outside the anterior mandibular articulation, diverge outwards to the 
margins of the forehead in front of the trabecular angles, sending 
internal branches round the inner margins of the dark chitin of the 
forehead, which run forward to support the forcipate lobes. Just before 
these latter reach the level of the hind border of the emargination, 
they exhibit a sharp curl outwards and inwards again, which is too 
small to appear in the figures, but which is obviously the homologue of 
the much more prominent structure of the same nature found in 
Ornithohius. 
The occipital apodeme apparatus is a httle complex, and comprises 
a black crescentic piece supporting the median convexity of the occiput, 
which has the appearance of being poised upon a black triangular 
projection of the pro thorax, while a pair of apodemes of the usual con¬ 
vergent type project backwards into the prothorax. 
The prothorax is ahke in the sexes, rectangular, with the anterior 
angles truncated, the posterior square, with projecting, crater-fike 
stigmata, and the hind margin shghtly convex. It is dark brown, 
with a fight median space, the lateral margins being blackish brown. 
The metathorax is almost twice as wide as the prothorax, with forward 
projecting antero-lateral angles, swollen sides, widest posteriorly, with 
truncated postero-lateral angles, and a hind margin somewhat convex 
on the abdomen. It also is divided by a median uncoloured line, which 
does not quite reach the hind border in the $; and is darker at the 
antero-lateral angles and along the lateral margins. Between the 
metathorax and the first abdominal segment appears an angular pro¬ 
jection, which is part of the endo-sternal apparatus in connection with 
the acetabulum of the third coxa. 
Parasitology vii 
26 
