256 The Ohio Journal of Science [Vol. XVIII, No. 7, 



Chelogynus osborni n. sp. 



This species parasitizes both nymphs and adults of Chloro- 

 tettix unicolor Fitch, infested individuals of which are found 

 from late June to middle July in the vicinity of Sandusky, Ohio. 

 The sac is always located on the thorax either to the right or 

 left side between the meso- and metathorax in the suture just 

 below the middle coxa. When it first appears it is very small 

 and blue green in color, being almost invisible against the green 

 of the host. After five days it assumes the normal black color 

 and when fully developed it is nearly circular, laterally strongly 

 compressed, and dull black in color. The third exuvium is 

 strongly rugosely sculptured. Nine days after the appearance 

 of the sac the parasite maggot issues and kills the hopper. It 

 is relatively large, green, and bears few scattered hairs. The 

 male parasite is usually much smaller and does not completely 

 devour the host. The cocoon is spun in the soil and is 3.5-4.5 

 mm. in length, broadly oval, white, with sand or soil particles 

 plastered over the outside. There is but one generation a year 

 in this region, the larvae hibernating and pupating the following 

 spring. 



Phorbas mirabilis (Perkins). 



This species attacks both nymphs and adults of Bruco- 

 morpha oculatus Newm., the latter being more often parasitized. 

 From one to three sacs may be attached to one individual and 

 all may mature even though they are of different sizes. The 

 sacs are always found protruding between various segments on 

 the hopper's abdomen. In one specimen three sacs were found 

 attached between the second and third, third and fourth, and 

 fourth and fifth abdominal segments respectively. The fully 

 developed sacs vary from one to two mm. in diameter. They 

 are shining black in color, the outer exuvium being distinctly 

 rugosely sculptured. The larva is of a pale purple color when 

 it first matures. The cocoon is spun in the soil and is large 

 varying from 2 to 4 mm. in length and 1 mm. in width. It is 

 very tough and composed of white silk, intermixed with soil, so 

 that it is of a dull brown color. The adult escapes through a 

 large, ragged hole cut through at one end. There are two 

 generations a year, the first occurring in July and the second in 

 September. 



