CHARACTERISTICS OF LARV^ OF ANOPHELINA. 155 



Frontal hairs (PI. XXIII, fig. a). — Median anterior 

 fairly constant, with slight variations in number and position 

 of spicular branches shown in drawings ; external and 

 posterior very fine and variable. 



Palmate hairs. — Large with very long fine filament; 

 rudimentary in shape but with numerous leaflets on thorax 

 (PI. XXIII, fig. c), with a well-defined long filament on first 

 abdominal, but notching at slioulder indistinct and hair 

 generally folded in death ; well developed on second to 

 seventh segments inclusive (Pis. XXIII h, XXIV k). Average 

 radius, 0'166 mm. ; maximum 0"187 mm. ; minimum 0"154 mm. 

 Eelation of filament to combined length of filament and 

 leaflet as 0"3o to one ; maximum 0'38 ; minimum 0"28. It 

 comes near to ar den sis, but the general shape is different, 

 and the filament of palmate hairs longer and finer, while the 

 terminal hair on the antenna of ar den sis is simple. 



Habitat. — Only found three times, once near sea level, 

 twice at 2200 ft., in both situations in eddies in fast-running 

 streams, about shoots of grass and rushes. 



Relation to Malaria. — Xo evidence of any. 



DESCRIPTIONS OF PLATES XV— XXVI, 



Illustrating Mr. Ernest Hill and Mr. L. Gr. Haydon's paper 

 on '' A Contribution to the Study of the Characteristics 

 of Larvffi of Species of Anophelina in South Africa. ^^ 



All the figures are on precisely uniform scale. All figures of larvae 

 and parts are taken from mature specimens unless otherwise stated. 



Drawings are taken from the dorsal aspect of larva, and all hairs, 

 which are fairly apprecial>le at the magnification employed, and which 

 can suitably be l:)rouglit in from the dorsal aspect, are represented. 



Measiirements. — A micrometer scale was aj^plied to every detail, 

 although lack of uniformity of plane in some precludes aljsolute 

 accui'acy. 



Palmate hairs. — Radius measured from origin of stem on body 

 to extremity of filament or sharp end of leaflet in direct line with tlie 

 stem. Leaflet for comparison with filament from origin on stem to 

 end of filament. Filament from tip to level of first notch on shoulder 



