LIST OF THE ANOPHELTNES OF THE MALAY ARCHIPELAGO. 



87 



stem a number of long apical branches (10 or more), somewhat resembhng the ex- 

 ternal clypeal hairs of M. umbrosus. 



Fig. 10. Abnormal clypeus of larva of 

 Myzorhynchus sinensis. 



8. Variations in the larvae of Myzomyia ludlowi and M. rossii. 



As yet we have not succeeded in differentiating these species ; in both we have 

 noted the following variations of the mature forms : (a) The posterior clypeal hairs 

 are of normal length and bifurcated, or much shorter and trifurcated ; (6) the 

 median clypeal hairs are bifurcated ; (c) all clypeal hairs bear 2-5 long apical branches. 



These variations are infinitely more common in M. rossii than in M. ludlowi. 

 Sometimes we found M. rossii emerging from larvae resembling those of M. vaga 

 (indefinita). 



9. Variations of the Larvae of Myzomyia vaga (indefinita). 



We never found M. vaga with larvae like M. ludlowi, they always adhere to the 

 type first described by Strickland (1915), viz., with the short external and posterior 

 clypeal hairs, the latter placed at a short distance behind the median clypeal hairs 

 and closer together than these. As variations we have noted the bifurcation of the 

 median and posterior clypeal hairs, the latter being placed farther backwards ; also 

 they may be placed close together, the one a little in front of the other. 



10. Nyssorhynchus schiiffneri (fig. 11). 



The larva was described by Mangkoe Winoto (1918). They are difiicult to distin- 

 guish from those of N. fuliginosus. The following are the characters which separate 

 them : (a) the median" clypeal hairs bear more and longer branches ; (6) the posterior 

 clypeal hairs are unbranched or bifid ; (c) the stems and roots are less thick than in 

 iV. fuliginosus ; (d) the filaments of the leaflets on the fans are somewhat shorter 

 than in the same organs of N. fuliginosus. 



