120 ERNEST HILL AND L. G. HAYDON. 



elsewhere^ probably the premier ag-ent in conveying the 

 disease in NataL Further, until all details of an Ano- 

 phelina were ascertained, it would need go nameless, in 

 regard to group. 



It is, on the whole, unfortunate that generic grouping on 

 narrow and refined differences was ever attempted. It 

 appears to us that the need is for a better representation 

 of specific characters. Descriptions which will adequately 

 convey the writers' meaning to the reader are difficult to 

 draw up. Such terms as " spot " " patch," " small spot," 

 etc., are too vague to give sound guidance. There is also 

 much variation in the markings of the wings of individuals 

 of a species. A photograph ot a wing showing clearly all 

 markings with a tabular statement, giving variations met 

 with in a given number of species, is a much greater aid in 

 making determinations. This method we have adopted to 

 the extent admitted by the number of specimens of a species 

 in our possession. 



Some points to which specific importance has been 

 attached in Theobald's ^Monograph' cannot be admitted to 

 have the value attributed to them. Stress is laid in descrip- 

 tions of Myzorhynchus paludis and niauritianus on 

 the proportion of the second hind tarsus which is white, and 

 the presence or absence of a wing spot, as distinctive points. 

 As will be seen from particulars given in the systematic 

 portion of this paper, the wing spots vary much in size to the 

 point of total extinction, and the proportion of white in the 

 second hiiid tarsus from seven-eighths to one-fourth, but the 

 variations in the wing spots do not coincide with the amount 

 of white in the tarsus, nor have we been able to make out 

 any corresponding difference in the larvas. 



In our collection we have a single specimen of a female 

 imago, in which there is marked difference in tlie two wings. 

 The insect belongs to a species, which more nearl_y corre- 

 sponds to Theobald's Myzomyia fu.nesta than to any other 

 of his species, although of a lai-ger size. On one wing, the 

 middle of the three main white or yelloAv spots, described as 



