1952] 
Wheeler and Wheeler — Ant Larvae 
121 
cochaetae are again replaced by Acrochaetae with this 
peculiarity however that they have their ends cleft into 
two or four ramifications (only discernible with the use 
of the immersionlens) or even somewhat plumose. With the 
younger stages of the larva the Oncochaetae occur on the 
first 5 abdominal segments, with the full-grown larva only 
on the first 3. Occasionally they occur on 4 or 6 segments 
but never on 7 as is the case with M. ruginodis. The number 
of hairs can only vary after moulting, so that if small and 
hungry larvae look more hairy than well-fed ones there 
is still no real difference. Their distance from each other 
is somewhat less than their length ; the Oncochaetae f .i. are 
implanted circa 120 Micron one from the other in each 
row. The anchor-shaped hooks have a width of 22 to 55 
Micron, according to the point of observation. The last 3 
abdominal segments look hairy on all sides like the pro- 
thorax, but only apparently so, as these segments are curved 
towards the ventral side, the caudal end of the body being 
formed by the dorsal face of the last 2 or 3 abdominal seg- 
ments and the proctodaeum opening on the ventral side. 
Orally from it there are no hairs or at least very few on 
the ventral side of the abdomen. The transversal rows 
are less regular. On the head there are only hairs of the 
smaller type ; 3 on each side along the occiput, an irregular 
row of 4 longitudinally near the coronal suture, a row of 4 
in zigzag formation slanting obliquely from the mandibula 
to the back of the head, a row of 4 small ones on the cheek 
slating upwards to the back of the head, and 2 on each 
side of the elypeus” (pp. 28-29). 
“The Mandibulae, the most sklerotized parts, internally 
coated with epithelium and in the centre with tracheal and 
nervous tissue, both up to the point where the teeth begin. 
A mandibula consists of a vertical elongated triangular 
plate, connected with the frenum and on which the muscles 
are inserted, and a medial plate joined perpendicularly, 
that gradually merges into the vertical plate and bears 
the teeth, an awl-shaped apical one, two large incisive 
teeth and several ranges of pointed tubercles that are 
suitably adapted to serving as molar teeth. . . The Sensilla 
turrets of the Maxilla are often indicated as larval palps, 
and so are the sensilla turrets of the Labium. The maxilla 
