THE LARVAE OF MALAYAN ANOPHELES. 169 



Abdomen : Segments ii. and vii. carry fully developed stellate tufts composed of 

 eight to twelve long narrow leaflets without filaments. On segments iii. to vi. the 

 leaflets number fifteen to eighteen and have well defined filaments. The average 



Fig. 12. Anopheles leucosphyrus, Don. 



length of the leaflets on the mid-abdominal segments is O'lO mm. The average 

 relation of length of filament to total length of leaflet is as 1 to 2*5. There are several 

 indentations at the base of the filament, which is sharply pointed. 



9. Anopheles maculatus, Theo. (c/. fig. 10). 

 Average length at maturity 4*5 mm. 



The larva of this species differs from that of Jcarwari only in the form of the leaflets 

 of the stellate tufts of the mid-abdominal segments. In macidatus the average length 

 of these leaflets is 0*06 mm. The average relation of the length of the filament to 

 the total length of the leaflet is as 1 to 4. The filament is deeply indented at the base 

 and is sharply pointed. 



10. Anopheles rossi, var. indefinitus, Ludl. (figs. 13, 14). 

 Average length at maturity 5*0 mm. 



Head : Anterior clypeal hairs. Inner hair long, slender, simple ; outer hair, 

 short, simple. Posterior clypeal hairs short, simple, being placed unusually far for- 

 wards on the clypeus and between the inner pair of anterior clypeal hairs. This 

 arrangement of clypeal hairs is characteristic for this variety. Occipital hairs. 

 Inner hair long, simple ; outer hair branched. 



