

THE TICKS 29 



EXERCISE 16 



LOUSE FLIES 



ORDER DIPTERA, FAMILY HIPPOBOSCIDdE 



A. The louse flies are extremely chitinous, dorso-ventrally 

 flattened insects, with suctorial mouthparts. Most of the 

 species are winged, and are often also called forest flies; the 

 wingless species are called "ticks," but should not be confused 

 with the true ticks (Ixodidae). 



B. Study a specimen of the sheep "tick," Melophagus ovi- 

 nus, noting the following characteristics: 



a. Louse-like form and reddish color. 



b. The head is extremely small and the proboscis is prominent. 



c. The species is wingless. 

 Draw the specimen. 



C. Examine a puparium of Melophagus ovinus. 



D. If available, compare a deer "tick," Lipoptena depressa 

 with the above. 



E. The forest fly, Hippobosca equina, is a winged species. 



a. In what respects does this species differ fromMelophagus 

 ovinus? In what respects do the two agree? 

 Draw the specimen. 



-:.>VU^W> 



EXERCISE 17a 







THE TICKS 



ORDER ARACHNIDA, FAMILY IXODIDAE 



Anatomical Study. 



Ticks belong to the same group as do the spiders, and therefore 

 have four pairs of legs in the adult stage. With a specimen of the 



