a new form of larvsc of Fsychodidse.. 493 
species, because (if tlie figure is exact) they might afford 
a clue to its position in the section. 
Referring once more to fig. 19, in connection with the 
suspicion attachable to it of being possibly derived from 
a species of Pericoma (to which allusion was made above 
in the preliminary survey of the plate) : the absence of 
a forceps-basis seems quite conclusive against such 
a suspicion. For this hypothesis would require the 
homologies ascribed to the parts in the earlier portion 
of this note to be transposed, so that what was there 
taken to be ventral would become dorsal, and vice versa. 
The first explanation seems much the most probable. 
So far then as one can judge from the figures, Maruina 
joilosella is likely to be a species of Psychoda allied to, 
but perhaps subgenerically distinct from, Ps. phalse- 
noides ; and M. spinosa a species of the second section 
of Pericoma, or less probably of the first section. These 
two so-called genera comprise a considerable number of 
subgenerical types recognisable by differences in the 
imago ; and it would not be surprising were it found that 
these types are distinguishable also by differential 
characters in the larvae or pupae. 
TEANS. ENT. SOC. LOND. 1895. — PART IV. (dEC.) 32 
