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dominal segment of the cricket to the membrane between notum 

 and pleuron, and lay along the right side of the abdomen; the pos- 

 terior end at time of capture was about opposite the metathorax, 

 and the anterior end at the eighth abdominal segment. The sac 

 was reniform, leathery in texture, brownish gray in color (slightly 

 darker than the cricket itself), and nearly circular in cross-section. 

 Its size and place of attachment thus forced the hind leg downward 

 and far out of its normal position; but, aside from the loss of the 

 use of this member of its body, the cricket appeared to be but little 

 inconvenienced. 



During the next few days the parasite increased rapidly in bulk 

 until, on the morning of the ninth, three days after capture, it was 

 about equal in size to the abdomen of its host, measuring just 

 7 mm. in length and 3.5 mm. in diameter. At 1 p.m., the integu- 

 ment was seen to have split in front along the median dorsal line, 



Fig. 1. Exuviae of Rhopalosomn p>eyi. Cr. .1, anterior; P, posterior. 



and through the split projected the head of the larva. By 2 p.m. 

 three body segments were exposed above, the larva furthering this 

 process by movements of the body. The cricket remained nearly 

 motionless, only occasionally vibrating its palpi. At 4.30 p.m. 

 there seemed to be no change, and further observations could not 

 be made until the next morning. Then the cricket was dead; the 

 sac was split along the dorsum from end to end; and the parasite 

 itself was beneath the soil. Here it remained until some time in 

 December when, at the suggestion of Mr. H. S. Barber, it was re- 

 moved and placed in a plaster cell. According to Barber, the adult 

 emerged indoors about March 1. 



The several exuviae (fig. 1) which remained attached to the crick- 

 et after the penultimate ecdysis indicate at least five larval instars, 

 inclusive of the one passed underground. Towards the point of 

 attachment the surface is smooth and shining, becoming granulate 



