THE BREEZE FLIES. 



753 



upper region is composed of very 



two distinct regions. The 

 large facets, while the 

 remainder is composed of 

 ver}^ small facets. This 

 remarkable arrangement 

 of the facets is found in 

 several other insects. 



There is a genus of 

 Tabanidse called Acantho- 

 mera, or "thorn-legged," 

 because a sharp spike 

 projects from the end of 

 the thigh. They are very 

 large insects, and much 

 resemble the grey flies 

 popularly known as Mil- 

 lers, except that they arc 

 much larger. 



The species which is here given is Pjrazilian. I'hc abdomen 

 is dark brown, and so is the thoiax. The latter, however, is 



Fig, 493 — Tabanus ]iilari.s. 

 'Deddish brown.) 



I 111! niera Heydenii. 

 iid siher gi-ey.) 



covered with a coating of silken down, arranged in stripes of 

 silver-grey, black, brown, and white. The eyes are so large 

 that the multitudinous facets of which they are composed are 



