164: 



A. T. STANTON. 



third the length of the inner, simple. Type II. (fig. 6) : Inner hair long, basal third 

 or stem stout and bare ; at the end of the stem the hair branches into three to six 

 divisions, each equal to twice the length of the stem ; outer hair short, usually 

 simple, but may be bifid at its extremity. Posterior clypeal hairs short, branched 

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

 with three divisions, the outer with five or six divisions. Antenna carrying a stout 

 branched hair placed dorsally on the shaft near the base. 



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

 of long narrow leaflets without filaments. 



Abdomen : Segment i. carries a stellate tuft composed of five to seven short narrow 

 leaflets without filaments. Segments ii.-vii. carry fully developed stellate tufts 

 composed of fifteen to twenty broad leaflets with well defined filaments. The average 

 length of the leaflet on the mid-abdominal segments is 0*075 mm. The average 

 relation of length of filament to total length of leaflet is as 1 to 4. The filament is 

 deeply indented at its base and sharply pointed. 



Fig. 6. Anopheles aitTceni, James (Type II.). 



Alone among the larvae of Malayan Anophelines that of aitheni exhibits variation 

 in the form of the anterior clypeal hairs. Two principal types are here described, 

 but it has been observed that combinations of these occur, even on different sides of 

 the same larva. 



3. Anopheles asiaticus, Leic. 



The mature larva of this rare species was first described by C. Strickland (Parasi- 

 tology, vii, p. 12, 1914), who has kindly permitted me to examine his specimens and 

 to reproduce his description. 



Head : Clypeal hairs, (i) Anterior : The internal hairs are long, stout, and close 

 together, as in members of the Myzorhynchus group, and are bifurcate about their 

 middle, (ii) The external hairs are about half the length of the internal, stout, 

 projecting forwards and outwards, and simple, (iii) Posterior : These hairs are a 

 httle longer than the external ones and are simple and delicate. 



