34 



Dr. D. Keiiin on the Larvcc dr. of 



3. Enibivo in the eg^^ curved. 



4. The hiivie move m a serpentine 



manner, or by means of very 

 active mandibles. 



5. The t;ej>:ments of the body are 



separ.ited bv intercalary rings 

 (PI. V. lig.38). 



6. The larval head with a pair of 



tentorial mds (PI. II. tigs. 1 

 & 2, t.ii.) similar to those of 

 the larvie of Trichocera. 



7. Antenuie with a special sensory 



org-au (PI. V. fig. 37, h.s.), 

 corresponding to tlie bell- 

 shaped papilla of man)' other 

 dipterous larvas (for instance, 

 those of Ditomyia and all 

 cyclorhapho-us I)iptera) and 

 With some small cylindrical 

 papillte, 



8. Mandibles (PI. Y. figs. 35 & 



36) show two distinct por- 

 tions : basal portion (b.p.) 

 with an internal hook (/(.), 

 and terminal or apical por- 

 tion {t.p.) which is more 

 chitinised, ending in three 

 teeth and bearing two brushes 

 of brown setse. 



9. Maxiliie fleshy and soft ; the 



maxillary palp (tigs. 1 & 2, 

 m.p.) broad, thick, trans- 

 parent, bearing two groups of 

 sensory papillae («. and b.) ; 

 the interna] part of the 

 maxillfe {in.x.), besides a few 

 sensor}' organs, bears nume- 

 rous long setae. 



10. Labrum with two mid-ventral 



protuberances covered with 

 hairs (figs. 1 & 2, l.r. & p.r.) 

 and a small comb-shaped 

 plate (cm.) on each side of 

 posterior protuberance. 



11. Labium well developed and 



with distinct labial palps 

 {Ip.). 



12. The thoracic sensory organs 



which are the remams of the 

 thoracic legs are composed 

 of four hairs (two long and 

 two short). 



3. Embryo straight. 



4. Tlie larval movements are 



worm-like. 



5. No distinct intercalary rings 



(PI. III. lig. 3) ; only some 

 larvaj — for instance, those of 

 Ceroplcdus — have the seg- 

 mentation of their abdomen 

 masked by superadded trans- 

 versal folds. 



6. Head without tentorial rods. 



7. Antenna; either elongated as in 

 BoUtophita (PL III. fig. 4, 

 A.n.f and fig. 13) or reduced 

 to a flat, wide, non-chitinised 

 surface bearing some very 

 small sensory papillaa. 



8. Iklandibles (figs. 5 & 7) flat- 

 tened, strongly chitinised, and 

 with their internal margin 

 toothed. 



9. Maxillse (PI. III. figs. 10, 11, 

 12) flattened and strongly 

 chitinised, with their internal 

 margin {m.x.) toothed, like 

 those of the mandibles. The 

 maxillary palps {m.p.) are 

 very much reduced. 



10. Labrum (figs. 6 & 8) without 

 mid-ventral protuberances 

 and without comb-shaped 

 plates. 



11, Labium reduced and not visible 



from exterior. 



12. Thoracic sensory organs com- 



posed of four hairs of eq[ual 

 length (tig. 9). 



