CYATHOCERUS. 143 
The maxilla (Tab. IV. fig. 18°) is of extreme fragility and possesses no hard portions, 
it being, as I have already said, entirely included in the interior of the head ; it possesses 
a single elongate slender lobe, the apex of which is slightly dilated and notched so as 
to form two short processes; and its inner margin is set with some peculiar sete or 
teeth, those at the extremity being broad and flat, while below this they become 
more elongate, slender, and hair-like. The palpi are apparently three-jointed, the 
basal joint being stout and strongly elbowed; the two following joints are simply 
cylindric, and differ little from one another except that the apical one is slightly 
longer and more slender than the preceding. 
The mandible is very delicate, elongate and slender, not much curved ; but its apical 
portion is apparently twisted so as to be on a different plane to the rest of the blade, 
and at the extremity is somewhat bifid. 
The inferior surface of the head when retracted is free, and receives but little 
protection from the prosternum. 
At the front angle of the prothorax there is, looking directly forward, a large hollow, 
which, when the antenna is retracted, protects its truncate extremity. 
The prosternum is a simple transverse band, sending off in the middle backwards a 
broad and short prosternal process, which does not extend behind the coxe. ‘These 
latter are rather small, not prominent; the side pieces of the prosternum do not reach 
the prosternal process, but are separated from it by a broad space. 
The under surface of the body is irregularly sculptured and marked by strong ridges, 
so that it is most difficult to decide as to what are the true sutures between the 
different pieces. The middle articular cavities are circular and are broadly separated ; 
the mesosternum is rather large, and in the middle behind penetrates between the 
coxe, articulating with the metasternum halfway between the coxe by a curved suture. 
The metasternum is rather large; its side pieces are apparently quite concealed by the 
wing-cases. The hind coxe are rather broadly separated; the portion to which the 
trochanter is attached is not large ; and there isa second small external piece proceeding 
outward to articulate with the metasternal side piece. 
The abdomen possesses five visible, short, ventral segments, separated by excessively 
deep sutures; the broad process between the hind coxe is a part of another segment, 
the sides of which are concealed by the coxe; and when the abdomen is dissected off it 
is seen that this concealed portion consists of two segments, both of which enter 
apparently into the intercoxal piece. If this interpretation be correct, there are seven 
ventral segments, two of which are visible in the middle between the coxe, and the 
second of the two also at the outside, while the other five form the exposed portion of the 
hind body, the first of the five being but little longer than the following one; segments 
2-4 of similar length, very short; terminal segment as long as the two preceding. 
The wings are ample; and the elytra are very convex, completely cover the upper 
portion of the hinder part of the body, and at the middle of the epipleura exhibit a 
