i9o6 M /TCnHI.].-^ MOl'J JI J’AKl S OJ- XOS(^l HO /.Ah\.U\ 
present classed. Tlie larva, however, differs from Megiu liiitiis in several import- 
ant respects, not only in mouth parts but also in regard to external characters. 
In the antennae are situated far forward, and the eyes are near the 
middle of the side of the head : in I’sorophora the antennae are near the middle of 
the side of the head, and the eyes are near the caudal angle. On the thorax of 
Mcsparhinus -i-xti a number of stiff, coarse spines with spinules ; no such spines occur 
in riorophora. In Me^arhinus the hairs of the abdomen are on large, heavily 
chitinised papillae, which is not the case in Psorophora. Me^arhinus has the 
comb of the eighth segment represented by a chitinised jilate from which spring 
two bristles and three minute tufts ; the comb is present in Psorophorn. The 
hairs of the ninth segment brush in J\Iegarhiinis ■A.xt. branched, not in tufts; in 
Psorophora they are simple and in tufts. The breathing tube in Megarhinus is 
without a pecten; Psorophora has a large pecten. 
The adult Megarhinus has a strongly decurved proboscis, while in Psorophora 
it is straight. The depressed scales of the head and body in Megarhinus are 
much w'ider than in Psorophora ; moreover, in Megarhinus the scales of the legs 
are never erect as in Psorophora. Therefore Pso/ophora can neither be placed in 
the same .sub-family with Megarhinus nor with Cu/ex, but should constitute a di.s- 
tinct sub-fainilv, Psorophorinae. 
