that spread Disease. 



13 



gnat or mosquito, Culcx pqnens Linn., an insect which, although 

 it can make itself unpleasant, does not transmit malaria. 



The models on the South side of the case represent the insects 

 in the resting attitude, and illustnite a characteristic diti'erence 

 between anopheline and culicine mosquitoes. The former have 

 the proboscis, thorax and abdomen set in a straight line, whereas 

 culicine mosquitoes, when viewed from the side, have a hump- 

 backed appearance, owing to an arching of the thorax, so that the 

 line of the proboscis is set at an angle to the axis of the hinder 

 part of the body. When resting on a wall or other flat surface, a 



Fig. 2. — Anopheline and^Culicine Mosquitoes in Resting Attitude. 



A. Amrpheles maculipennig, female, X 4. 



B. Ctdex 2)ipieii-f, female, X i- 



culicine keeps the abdomen more or less parallel to the surface, 

 whereas an anopheline slopes the abdomen away (fig. 2). 

 Anophelines nearly always have spots on the wing. In both 

 sexes of anopheline mosquitoes the maxillary palps are as long 

 as the proboscis, and those of the male are clubbed at the tip. 

 In culicines the palps of the female are much shorter than the 

 proboscis, and those of the male are a little longer than the 

 proboscis, and usually not clubbed at the tip — in mosquitoes the male 

 can be readily distinguished from the female l)y the more plumose 

 or fluffy antennae. In culicines the abdomen is completely clothed 

 with scales like those on a moth's wnng, some of the scales forming 



