152 ERNEST HILL AND L. G. HATDON. 



could be detected between them and other males in which its 

 absence had been ascertained. It is strange that so remark- 

 able a feature should have no specific or other importance. 



The larva of this species, whether it be paludis or mauri- 

 tianus, differs from barbirostis, as figured b}^ James and 

 Listen, in the relative thickness and number of branches in 

 the dendriform frontal, in the presence of posterior frontal 

 hairs, and in the character and position of palmate hairs. 

 We have not observed branching of median anterior hairs. 

 The two species must, therefore, be deemed quite distinct. 



Habitat. — Rarely, if ever, found in water in which grass 

 and Aveeds were not growing, otherwise in stagnant (occa- 

 sionally), very slow or steadily flowing water, clean or polluted, 

 but not actually foul. It is generally possible by the appear- 

 ance of water to predict whether this species will be found or 

 no. For the most part one only, and rarely more than three 

 mature larvae will be taken at a single dip. Widely dis- 

 tributed from sea level to 4000 ft. 



Season . — Perennial. 



Relation to Malaria. — Found in areas of epidemicity, 

 where costal is is more common in the summer, and in places 

 where the disease is of sporadic occurrence, in which, how- 

 ever, f unesta is also found. 



Myzorhynchus natalensis 11. sp. 



No description, even approximately, representing the 

 characters of this species is found in 'Monograph of the 

 Culicida^,' or Giles^ ' Revision of the Anophelinge.^ It may be 

 thus described : 



A medium-sized mosquito, of which the general aspect is 

 black with white and yellow markings ; legs brilliantly spotted 

 and banded, hind tarsi white. The closely-set, broad lanceo- 

 late scales on the wings and the scaly palpi clearly place it 

 alongside of paludis, that is to say, in the genus Myzo- 

 rhynchus, althoug-h we are unable to detect any ventral 



