110 



THE ENTOMOLOGIST. 



the frog, whether large or small, was caused thereby ; and in 

 fact these creatures generally die after the larvae have worked 

 their way out. 



1. Pupa of Batracliomyia attached to a stone. 



2. Upei'oleia marmorata, an Australian frog, with the skin of its side par- 

 tially laid back to show the larva of Batrachomyia in situ. 



3. The same, the skin remaining entire. 



4. Wing-rays of Batrachomyia, 



5. Another oestrideous larva, parasitical on Hyla citropus, another Austra- 

 lian frog. 



" The perfect insect, a small yellow fly, called by Mr. W. 

 S. MacLeay, Batrachomyia, was first reared by Mr. George 

 French Angas ; the typical specimen is now in the Austra- 

 lian Museum, and was obtained from a species of Cystigna- 

 thus (C. Sydneyensis), the most diminutive of our frogs ; the 

 specimen I reared lived on another small Batrachian (Upe- 

 roleia marmorata), and is to all appearance a different spe- 

 cies. Having obtained a frog in the beginning of April, when 

 the larva had almost reached its full size, and deposited it in 

 a glass vessel with some moist earth and moss, I found that 

 the parasite left its shelter a few days afterwards, the frog 

 dying as usual in consequence. I observed the yellow larva 

 for more than twenty-four hours traversing the moss, and 

 found it, after thirty-six hours, completely ensconced in 

 a black covering, but without being attached to any object ; 

 whilst in a state of nature the chrysalis is generally fastened 

 to the under side of some piece of rock in damp localities. 

 Thirty-two days afterwards the perfect insect emerged. 



" I have subsequently attempted to breed other specimens, 



