204 AN ACCOUNT OF BRITISH FLIES. 
“that the Zarve of Chironomus have been shown by Grimm to lay | 
eggs which develop exactly in the same way as fertilized eggs into 
larvee.” There may possibly be some misinterpretation in the 
English translation ; if not, Mr. Swainson’s and my own experience 
go against this ‘‘ pupal-parthenogenetic reproduction.” 
Fic. 44.—Three undescribed Larvze of Chivonomus (sps. ?). Swainson. 
fa,The above are three figures of undescribed larva: sent me by Mr. 
Swainson, and his notes are given below : 
i. The two upper mandibles, one of which is shown at X, work 
on a kind of pivot, but both meet for tearing purposes on the hard 
chitinous lower jaw, thus making a triangle. They work, in fact, in 
planes at right-angles to each other, their line of intersection being 
the axis of the head or lower jaw. 
li. The above are some details of a new larva of Chironomus 
(sp.?) found in the ponds on the Golf Links, St. Anne’s-on-Sea. 
a, the anal extremity ; b, the antenne. 
iii, Another new form of Chironomus larva (sp.?) recently dis- 
covered by Mr. Hammond, F.L.S., mining tunnels in leaves of 
Potamogeton (y). Body of larva 14 segments, including very pro- 
trusile and retractile head and anal segment very similar to one 
shown in fig. ii. The fore-feet are remarkable for the curious 
minute hooklets with which the skin below the larger hooks of the 
sucker foot are filled(« and 8). They look very like the proboscis of 
the Gephyrean worm Sipunculus. The posterior sucker feet are not 
ornamented like the fore-feet, but are longer and more protrusile. 
