390 
Neiv Mallophaga 
two backwardly directed dagger-like processes, and with a large central 
sub-circular perforation; with a winged prothorax; meso- and meta¬ 
thorax distinct, sub-equal, and resembling abdominal segments; other¬ 
wise like Menopon. 
Machaerilaemus latifrons, n. sp. Figs. 1-4. 
Fig. 1 gives the general form of the $, from which the d differs but 
little except in its smaller size, and in the usual sexual dimorphism of 
the hind end of the abdomen. The posterior segments of the d are 
shown in Fig. 3. 
The hc'i.d is extremely broad in proportion to its length, being more 
than twice as wide as long, and affording the greatest width of the 
insect. The forepart is flatly rounded, the sides of the forehead being 
much swollen and abruptly rounded, and roofing the antemiary fossa. 
The floor of this is formed by a forward continuation of the temple, 
which meets the inturned forehead at a point just behind the articulation 
of the palps; floor and roof being fused along their hind margins from 
this point to just in front of the eye, and enclosing a deep pocket in 
which the two terminal segments of the antenna can be completely 
hidden. The lens of the eye is fairly prominent, filhng the angle between 
forehead and temple, its outline being continued dorsally towards the 
temporal angle. It carries a short spine. The pigment spot is roughly 
square. The temporal angles are acutely rounded, and the occiput 
flatly sinuous. On the ventral side (Fig. 2) the most remarkable feature 
is the plate upon the throat, the shape of which may be seen from the 
figure. The lateral spinous processes project freely, but the median 
part of the plate passes backwards under the anterior border of the 
prosternum. Six or seven hairs arise from the plate on each side. 
The terminal joint of the palps is the longest, and they show a fine 
annulation, giving a serrate outline in optical section, that I do not 
remember to have seen before in the group. The antennae are of the 
usual type. 
The prothorax is winged, with an interscapular bar not quite reaching 
the scapulars (the intervening space being occupied by a small spine), 
and crossed by a median longitudinal crease for insertion of the dorsal 
prothoracic muscles. The claviculars are thick, and pass downwards, 
backwards, and inwards to fuse with the lateral angles of the prosternum. 
The mesothorax and metathorax are alike, and resemble abdominal 
segments. The thoracic sterna are shown in Fig. 2. The coxae of the 
O O 
