ha PV ern a ca at 3) ll 
xl 
the residue being ejected in the form of a solid body, the 
‘ Boulettes de nettoyage’ of Janet, which retains the shape 
of the infra-buccal chamber.” 
After the pellet has been ejected it must still contain a 
considerable amount of nutritious matter, for, as I have 
shown, it forms the chief, if not the only food of the larva 
of the Dipterous genus Microdon, and also forms part of 
that of the beetle larva of Clythra 4-punctata. But to return 
to the Pseudomyrminae, all four genera feed their larvae in 
] 
coIclLin 
Fees OD Cy 
3% 
HP 
Rota 
8" 
OD 
Was 
AS 
he bak - Jomyue 
‘es 
Fic. 3.—Head of Myrmica from “ British Ants,” p. 16. 
this way; and no other ants have been observed to do so, 
but eventually spit them out. The mouth of the larva pos- 
sesses a singular structure, the trophorhinium, with which 
they thoroughly grind up the pellet. This structure is also 
present in other ant larvae, and may be used as a stridulating 
organ. 
In the adults the shape of the head in the 9 and 4%, especially 
of the clypeus and frontal carinae, is unique; and the eyes 
