Table of the Larva of Indian Anopheles. 



above structures alone, but that a careful consideration of the 

 characters of all the structures taken together will yield the most 

 accurate results. This is necessary because, as Dr. Cogill has 

 recently shown, the characters of the frontal hairs may occasionally 

 vary even among a series of larvas from the same batch of eggs. 



As an aid to the identification of the larvae of some of the 

 Indian "anopheles," we may arrange those of which the characters 

 are known in the following table, which is a modification of that 

 given by Stephens and Christophers : 



I. ANTENIM/E WITH A LARGE BRANCHED HAIR 



A. With simple unbranched frontal hairs. 



1. A. lindesayi. 



B. With branched frontal hairs. 



2. A. barbirostris ;.. ... ... Median frontal hairs unbranched. The branches of 



the external frontal hairs arise from the main stem 

 and from other branches. 



3. A. nigerrimus ... ... ... Median frontal hairs unbranched. The branches of 



the external frontal hair all arise from the main 

 stem. 



II.-ANTENN/E WITHOUT A LARGE 

 BRANCHED HAIR. 



A. With fully developed palmate hairs on the thorax. 



(a) With simple unbranched frontal hairs. 



4. A. culicifacies ... ... ... The filaments of the palmate hair leaflets rather long. 



5. A. listoni ... ... ... Palmate hairs very large and distinct on the thorax 



and abdominal segments. Filaments of leaflets 

 shorter. Characteristic head pattern. 



6. A. culiciformis ... ... ... Basal hair characteristic. Median frontal hairs 



long. Leaflets of palmate hairs taper to a point. 



(b) With branched frontal hairs. 



7. A. jeyporiensis ... ... ... Two small branched posterior hairs in addition to 



the frontal hairs. Palmate hairs very large and 

 distinct. Filaments of leaflets short. 

 8 A. maculipalpis .,., ... ... No posterior hair. Filaments of palmate hair 



leaflets rather long. 



B. Without fully developed palmate hairs on the thorax. 



(a) With simple unbranched frontal hairs. 



9. A. rossi ... ... ... ... Characteristic head pattern. Fully developed pal- 



mate hairs on the 3rd to the 7th segments of 

 abdomen. Filaments of leaflets very long. 



10. A. stephensi ... ... ... No head pattern. Filaments of palmate hair leaf- 



lets shorter. 



11. A. theobaldi ... ... ... Filaments of palmate hair leaflets very short and 



blunt. 



12. A. maculatus ... ... ... Filaments short but sharp pointed. 



13. A. elegans ... ... ... Leaflets of palmate hairs taper to a point; no 



distinct filaments. 



14. A. turkhudi ... ... ... Two very long unbranched posterior hairs in addi- 



tion to the frontal hairs. Fully developed palmate 

 hairs on the fourth, fifth and sixth abdominal seg- 

 ments only. 



15. A. karwari. 



(b) With branched frontal hairs. 



16. A. fuliginosus ... ... ... Frontal hairs very much branched. 



17. A. pulcherrimus ... ... ... Frontal hairs only slightly branched or frayed. 



18. A. aitkeni ... ... ... External frontal hairs unbranched, median forked. 



[37 



