DAHLGREN, THE MALARIA MOSQUITO 



23 



bears the month-parts and special sense-organs. The thorax, which 

 consists of three closely consolidated segments, bears the organs of loco- 

 motion, the legs, one on each segment, the wings on the middle segment 

 and a pair of minute balancers on the third. The abdomen is distinctly 

 segmented and consists of eight rings, but, except on the terminal seg- 

 ment, it bears no appendages. The almost spherical head is somewhat 

 flattened in front. 



HEAD 



FlG. 17. MALARIA MOSQUITO. MALE. 



Magnification 7 diameters. 



The anterior portion of the head is occupied by two large compound 

 eyes, each composed of several thousand simple eyes or facets, regularly 

 arranged and so closely crowded together that their outlines 

 appear hexagonal. In such compound eyes each separate facet 

 receives rays of light from onlv a single direction, but the great number 



Head 



