INSECTS INJURIOUS TO THE ORANGE. 



405 



on tlie orange ; it is of an elongated, oval form, and highly 

 convex. The enclosed insect is yellow, inclining to brown, 

 of an elongated, oval form, nearly flat, smooth, and shining. 



The young larva (see Fig. 417) is of a long, oval form, of 

 a yellowish color, with two long thread-like fila- 

 ments extending; from the hind seo-ment. 



This bark-louse is much infested by parasites, no 

 less than^hree distinct species having been bred 

 from the scales. 



The first of these, Coccophagus cognatus Howard 

 (see Fig. 418), is a very small, four-winged fly, the 

 female of which, when its wings are spread, measures about 

 one-twelfth of an inch, the male about one-sixteenth. The 



Fig. 418. 



Fig. 419. 



body is of a dark-brown color, with yellow markings ; the 

 wings are transparent. 



In Fig. 419 is shown another of the parasites of this scale- 

 insect, known as Comys bicolor Howard, a small fly, which 

 measures, when its wings are expanded, nearly one-eighth of 

 an inch across. The fore wings are dusky brown on their 

 outer two thirds, the inner portion nearly transparent, with a 

 brownish streak ; the hind wings are nearly transparent. The 

 body is black, the thorax brown, with black hairs. This in- 

 sect has been found very abundant in Washington, destroying 



