542 



Malaria 



of entomology. The mosquitoes, or culicidae, must be rec- 

 ognized first by their well-known general form, and second 

 by the presence of scales upon some part of the head, thorax, 

 abdomen, and wings. 



Fig. 183 Various mosquitoes in attitudes of repose: a, Culex pipiens; 

 b, Myzorrhynchus pseudopictus ; c, Anopheles maculipennis (Manson). 



CLASSIFICATION (Stitt). 



There are four subfamilies of CULICIDJS, differentiated according 

 to the palpi: 



I. Palpi as long or longer than the proboscis in the 



male. 



i . Palpi as long as the proboscis in the fe- 

 male ; proboscis straight 



2. Palpi as long or shorter than the pro- 



boscis; proboscis curved 



3. Palpi shorter than the proboscis 



II. Palpi shorter than the proboscis in the male 

 and female 



Of these the Anophelinae is the one family concerned in the transmis- 

 sion of malarial fever, so that it is important to be able to differentiate 

 the genera included in the family. 



1. Scales on head only; hairs on thorax and abdo- 



men. 



1. Scales on wings large and lanceolate. 



Palpi only slightly scaled ............. Anopheles. 



2. Wing scales small, narrow, and lanceolate. 



Only a few scales on palpi .............. Myzomyia. 



3. Large inflated wing scales .............. Cycloleppteron. 



2. Scales on head and thorax. Scales narrow and 



curved. Abdomen with hairs, not scales. 

 i . Wing scales small and lanceolate ........ Pyretophorus. 



3. Scales on head, thorax, and abdomen. Palpi 



covered with thick scales. 

 i. Abdominal scales on ventral surface only. 

 Thoracic scales like hairs. Palpi rather 

 heavily scaled ...................... Myzorrhynchus. 



