20 MEDICAL ENTOMOLOGY 



b. Compare the palpi, note the extreme length in Anopheles, 

 nearly as long as the proboscis, while in Culex they are less than 

 half as long. 



c. Examine the wings for markings, spots, etc. Note that 

 Anopheles has spotted wings, which is the case in only a very 

 few species of Culex. 



Draw the head and its appendages in Anopheles. 



E. Compare the larva (wrigglers) of Anopheles and Culex. 



a. Note the long prominent breathing tube or anal siphon of 

 Culex, short in Anopheles. 



b. Note the arrangement of the tufts of hairs on the thorax 

 and abdomen. The anal tuft is especially prominent. 



c. Count the number of body segments comprising the ab- 

 dominal region. 



d. Examine the palmate hairs situated dorsally on abdominal 

 segments. 



e. On the head note the presence of eyes, antenna and mouth 

 brushes. 



Draw the larvae of both species, and label parts. 



F. Compare the pupa (tumblers) of Anopheles and Culex. 



a. Examine the prominent breathing trumpets (air siphons) 

 situated laterally and dorsally on the thorax. Compare the 

 breathing trumpets as to shape and position. 



Draw an Anopheles tumbler. 



G. Examine a slide of mosquito eggs. 

 Draw several specimens. 



H. a. Examine specimens of the yellow fever mosquito (Steg- 

 omyia calopus} and note the prominent silvery markings. How 

 are these markings distributed? 



b. What is the length of the palpi as compared with the pro- 

 boscis? Note other characteristics. 



Draw a dorsal view of the insect. 



