204 



AN ACCOUNT OF BRITISH TLIES. 



" that the larvcc of Chironomus have been shown by Grimm to lay 

 eggs which develop exactly in the same way as fertilized eggs into 

 larvffi." 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." 



tlG. 44. — Three undescribed Larvre of Cliiroiiomus (sps. ?). Swainson. 



■'i'.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. 



ii. The above are some details of a new larva of C'hironomus 

 (sp. ?) found in the ponds on the Golf Links, vSt. Anne's-on-Sea. 

 a, the anal extremity ; b, the antennK. 



iii. Another new form of Chironomus larva (sp. ?) recently dis- 

 covered by Mr. Hammond, F.L.S., mining tunnels in leaves of 

 Potajuogetou (7). 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 (a and /5). Tliey 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. 



