386 
New 3IaUopha{ia 
and widening to form a prominent dark-brown blotch at the inner end 
of the frontal cleft; the other passing straight backwards, and round 
the hind border of the mentum, to meet its fellow of the opposite side, 
the course being indicated by the inner dotted lines in the Text-figure. 
Just internal to the postero-lateral angles of the mentum, a pair of 
short bands run backwards along the borders of the sub-mentum. On 
the lateral margin of the forehead a slit-like frontal cleft, with chitinous 
lips, runs inwards. The rounded dorsal swelling, so characteristic of 
Menoponidae in general, is confined to the area between this cleft and 
the eye. 
The prothorax has narrow elongate wings. The shoulders are 
squarely rounded, the sides straight and convergent, the postero¬ 
lateral angles rounded, and the hind border only slightly convex. A 
strong interscapular bar runs across the pronotum, joining the scapular 
bands which bound the raised central region. Another vaguely defined 
band runs from the shoulder inside the scapular, overlying the clavicular, 
a structure found also in Heterodoxus. The mesothorax sends two 
conical projections under the pronotum, the inner anterior borders of 
which are strongly chitinous, and continue backwards and inwards as 
a pair of stout apodemes within the segment. Dorsal to these, a straight 
bar passes across the full width of the segment, from the outer ends of 
which pass downwards the bands supporting the acetabular margins for 
the second legs. This bar has in most Amblycera the form of two 
strong arches. The metathorax is narrow anteriorly, its straight sides 
diverging rapidly, the postero-lateral angles being acute, and the hind 
margin straight. The prosternum bears a well-defined blotch of charac¬ 
teristic shape, with lateral projections for articulation with the clavi- 
culars. It is remarkable for being naked, except for some broad flat 
denticles towards its posterior margin, which fade away gradually in 
front, leaving a slight scaly appearance. These denticles, which have 
suggested the specific name, are much better developed in the young, 
covering the mentum, sub-mentum, prosternum, and mesosternum; 
but in the adult they become reduced to a few about the bases of the 
palps, and those above-mentioned on the prosternum. The meso¬ 
sternum is an oblong plate formed by the fusion of the anterior inter-coxal 
bands, and carrying three hairs, two in front and one behind. The 
metasternum is a broad plate, covered with hairs. The coxae of the first 
pair have a rectangular anterior prolongation, and acuminate posterior 
ends, terminating in a stout spinous hair, with strongly arched inner 
borders. 
