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STUDIES IK LIFE-HISTORIES OF AUSTRALIAN DIPTERA BRACHYCERA. 



shown that the younger the larvae, the more difficult they are to preserve alive. 

 Adverse conditions which had no ill-effect on larvae over 6 mm. in length, in- 

 variably proved fatal to the smaller ones, and no larva under 5 mm. length, 

 when collected, has, so far, been successfully brought through to the pupal stage. 



Description of the newly-hatehed larva. 



Newly-hatched larvae measure from 0.8 to 0.96 mm. in length, and 0.27 mm. 

 in lateral width. The chief structural differences from older larvae are found in 



Afetoponia rubriceps Macq. 



Fig. 1. Empty egsj cases, and moult skin (M). (x 48). Fig. 2. Portion of moult skin 



shown in Fig. 1. (x475). Fig. 3. Newly hatched larva, (x 48). Fig. 4. Head of newly 

 hatched larva, (x 175). Figs. 5-6. Dorsal view (5) and ventral view (6) of segments 

 of newly hatched larva, (x 100). Figs. 7-8. Dorsal view (7) and ventral view (8) of seg- 

 ment of a larva 2 mm. long, (x 100). 



the formation of the head, and in the arrangement of the bristles on the body. 

 The eyes are quite rudimentary, and there is an entire absence of the lateral 

 lobes which form such a prominent feature in larvae of larger growth (Fig. 4). 



