438 ARTICULATES : INSECTS. 



ascend towards the surface, making circuitous, cylindrical 

 passages, about five eighths of an inch in diameter. 

 When the time comes, they leave the ground in the 

 night, crawl up the trunks of trees, and, after resting 

 awhile, prepare to shed their skins, which have now be- 

 come dry. After some effort, they open a longitudinal 

 fissure in the skin of the back, and through this opening 

 the full-grown and perfect cicada comes forth, leaving its 

 empty pupa-skin still attached to the tree. 



The Dog-day Harvest-Fly, C. canicularis, Harr., is over 

 an inch long, the body black above, ornamented with 

 olive-green, and the under side covered more or less with 



Fig- 333- 



Dog-day Harvest-Fly, C. canicitlaris, Harr. 



a white substance resembling flour. It makes its appear- 

 ance with the beginning of dog-days, and its singing 

 may be heard among the trees through the middle of 

 the day. The pupas of this species, as well as of the pre- 

 ceding, as they come out of the ground and crawl up the 

 trees, look like large beetles. 



FULGORID.E, Leach, OR LANTERN-FLY FAMILY. - - This 

 Family comprises insects which are distinguished by a 

 curious prolongation of the forehead, which in some cases 

 equals all the rest of the body, and is the part asserted 

 by writers to emit a strong light by night. They belong 

 mainly to tropical and sub-tropical regions. They pro- 



