J‘SYCnK 
[February 
I. Non-inskctivoruus 
11. UK.^.NO'I AK.N lA. 
HI. AN<ll'HKI.t.S. 
IV. I.NSUCTIVIIUDUS. 
MUUTll liRUSIIKS. 
Hairs slender, very 
numerous, slightly pec- 
tinateor simjile, project- 
i n g forward ; adapted 
for making a current to- 
ward the mouth. 
Same as I. 
Same as I. 
Stout, heavy, chitin- 
ised hairs, serrate on 
distal part ; held at 
right angles to head or 
folded under. Adapted 
for seizing. 
MANDIBLES. 
(See Eig. 1.) 
Ititing Part, (d.) 
Comprises i - lo of 
whole mandible. Ante- 
rior tooth heavy, rather 
blunt, not sharply dif- 
ferentiated from the 
three following teeth 
(of which the third is 
largest and longest), 
which do not recede 
sharply; two teeth, 
usually sharp and slen- 
der, at base of primary 
tooth. So m e short, 
Idunt teeth on ectal side 
of mandible below main 
group and not project- 
ing so far. Arrange- 
ment primarily for 
crushing. 
Same as I, except 
that the anterior tooth 
is especially heavy and 
blunt, and the teeth at 
base of primary tooth 
are heavy and blunt. 
Heavily chitinis ed; 
about 1-6 of whole bulk. 
Anterior tooth sharp, 
conspicious, not sharply 
differentiated from the 
three smaller teeth 
which are placed so that 
their tips form a sharp- 
ly receding line; two 
rather blunt teeth atop 
of the primary tooth at 
its base : a bunch of 
m any short, s h a r ]» 
spines and small teeth 
below last well deve- 
loped tooth. .Arrange- 
ment for tearing or 
crushing. 
Very heavily chitin- 
ised, forming about one- 
fourth of bulk. Anter- 
ior tooth (especially in 
Psof ophora) very long, 
pointed, well separated 
from rest, heavy ; other 
teeth sharp. .Arrange- 
ment for tearing. .Much 
more irregular than in 
the foregoing for m s. 
Stout accessory spine 
on side of base of [irim- 
ary tooth, ectal asj ect, 
in Psorophoia^ 
Art.icula i e ae r r ate 
spine. {i.\ 
Sometimes dee])ly, 
sometimes bluntly ser- 
rate, narrow or broad, 
long or short, but never 
so wide as biting part, 
on ental side and project- 
ing beyond biting part ; 
four to twenty serrate- 
plumose, slender mova- 
ble spines below it. 
Movement evi d e n 1 1 y 
like a chopper. 
(,)f one very large 
tooth, serrate at base 
and differentiated from 
the four followingsharp 
teeth; whole arrange- 
ment as large, though 
not so heavy, as the 
biting part. No small 
articulate spines. 
A heavy, wide, flat, 
irregularly serrate spine; 
below it are two articu- 
late, flat, narrow spines 
with hairs in the serra- 
tions. 
Not jnesent. 
Lateral ('omh. (d.) 
Many, never very 
heavy, elongate, some- 
what curved, triangular 
The three uppermost 
spines heavy andstrong- 
1 y chitinis e d ; base 
The three uppermost 
spines not conspicious- 
ly heavier than the rest. 
Long, curved, heavy, 
immovable spines, es- 
pecially heavy and flnely 
