MOSQUITOES. 



247 



Having determined that the insect is a female, we then proceed to place 

 it either in the subfamily Culicinae or Anophelinae by a study of the 

 relative length of the palpi to the proboscis. If the palpi are shorter 

 than the proboscis, it belongs to the Culicinae; if as long or longer, to 

 the Anophelinae. The palpi of the female Megarhininae are also 

 long, but the proboscis is curved. 



Having settled on the subfamily, we separate the genera by con- 

 sidering such points as character and distribution of scales on back of 

 head, wings, thorax and abdomen; banding of proboscis, legs, ab- 

 domen and thorax, shape of scales on wings and location of cross-veins. 



In the resting position Culex allows the abdomen to droop, so that 



FIG. 78. Anopheles. FIG. 79. Culex. 



Resting positions of anopheles and culex insects. (Drawn by C. O. Waterhouse.} 



it is parallel to the wall. The angle formed by the abdomen with head 

 and proboscis gives a hunchback appearance. 



Anopheles when resting on a wall goes out in a straight line at an 

 angle of about 45. It resembles a bradawl. 



Classification. 



There are 4 subfamilies of Culicidae, differentiated according to 

 the palpi: 



i. Palpi as long or longer 

 than proboscis in male. 



1. Palpi as long as proboscis in female; proboscis 

 straight. Anophelina. 



2. Palpi as long or shorter than proboscis; probos- 

 cis curved. Megarrhinince. 



3. Palpi shorter than proboscis. Cuticince. 

 2. Palpi shorter than proboscis in male and female. JEdince. 



