884 



THE ANIMAL CARRIERS OF DISEASES 



B. Costa with at least one pale area : — 



I. Mesothorax without true scales. 



[a) Wing scales mixed dark and light — Patagiamyia. 

 {b) Wing scales not so mixed : — 



1. Wing scales not inflated — Myzorhynchus. 



2. Wing scales inflated — Cycloleppteron. 

 11. Mesothorax with true scales — Arribalzagia. 



(From a photograph by J. J. Bell.) 



James distinguishes between 

 true scales, which are broad and 

 have distinct striations, and false 

 scales, which are hair-like and 

 have indistinct striations. 



The question whether any of 

 these serve as definitive reservoirs 

 by infection of the ova, as sug- 

 gested by Schaudinn, has never 

 been proved, but we doubt whether 

 much research has been attempted 

 in this direction. 



The anopheline mosquitoes 

 known definitely to transmit 

 malaria, arranged according 

 to recent methods of classifi- 

 cation and following Hindle 

 and our previous lists, are as 

 follows: — 



I. Anophelines definitely 

 known to be able to 

 carry the malarial 

 par asit es through 

 the complete cycle 

 of quartan, tertian, 

 or subtertian infec- 

 tions, or only as far 

 as zygotes: — 



Fig. 463. — Anopheles maculipennis 

 Meigen, 1818. A Carrier of the 

 Malarial Germs. 



{a) Anopheles Carriers. 



Number. 



Mosquito. 



Observer. 



Observation. 



Habitat. 



I 



A . algeriensis 

 Theobald, 1903. 



The 

 Sergents. 



To sporozoites. 



North Africa. 



2 



A . bifurcatus 

 Linnaeus, 1758. 



Grassi. 



Tertian. 



England . 



3 



A . maculipennis 

 Meigen, 181 8. 



Many. 



Quartan, tertian, 

 malignant tertian. 



Europe. 



