162 



A. T. STANTON. 



Key to the knoivn mature larvae of Malayan Anophelines 



1. Shaft of antenna with, a branched hair. . 

 Shaft of antenna without a branched hair 



2. Outer anterior clypeal hair thickly branched ; abdominal 



segments with large stellate tufts . . 

 Outer anterior clypeal hair with few branches ; abdominal 



segments without stellate tufts 

 Outer anterior clypeal hair simple or bifid terminally 



3. Innermost sub-median anterior thoracic hair (fig. 3) branched 



from base 

 Innermost sub-median anterior thoracic hair with simple stem 

 and four or five short branches terminally 



4. Posterior clypeal hair short, branched . . 

 Posterior clypeal hair long, simple (C. Strickland) 



5. Inner and outer anterior clypeal hairs branched 



Inner and outer anterior clypeal hairs simple, or inner only 

 with minute lateral branches 



6. Posterior clypeal hairs long, simple ; no stellate tufts on thorax 



or abdominal segment i 

 Posterior clypeal hairs short, branched ; stellate tufts on thorax 

 and abdominal segment i . . 



7. Filaments of leaflets of stellate tufts on mid-abdominal seg- 



ments sharply pointed 

 Filaments of leaflets of stellate tufts on mid-abdominal seg- 

 ments trmicated 



8. Outer anterior clypeal hair with short lateral branches 

 Outer anterior clypeal hair thickly branched . . 



9. Stellate tufts on abdominal segments i-vii 

 Stellate tufts on abdominal segments ii-vii 

 Stellate tufts on abdominal segments iii-vii . . 



10. Posterior clypeal hairs closer together between inner anterior 



ch^eal hairs . . . . . . . . . . 10. rossi 



11. Stellate tuft on thorax fully developed. . 

 No stellate tuft on thorax 



12. Outer anterior clypeal and posterior clypeal hairs very short 



13. 



umhrosus. 

 4 



4. barbirostris. 



11. sinensis. 



2. aitkeni. 



3. asiaticiis. 



6 



9 



9. 7naculatus. 



6. harwari. 



1. aconitus. 



5. fuliginosus. 



. . 10 



.. 11 



12 



var. indefinitus. 



7. kochi. 



8. leucosphyrus. 



12. tesSellatus. 



1. Anopheles aconitus, Donitz, (=albirostris, Theo.), (fig. 4). 



Average length at maturity 3*5 m.m. 



Head : Anterior clypeal hairs. Inner hair long and stout with numerous short 

 lateral branches. Outer hair about half the length of the inner and similarly branched. 

 Posterior clypeal hairs short, branched from the base into four or five divisions. 

 Occipital hairs short, branched from the base into four or five divisions. 



Thorax : On the posterior quadrant a fully developed stellate tuft composed of 

 twelve to fourteen long narrow leaflets without terminal filaments. 



