TWO NEW SPECIES of COLLEMBOLA. 

 By W. J. Rainbow, F.L.S., F.E.S., Entomologist. 



(Figs. 49-52). 



There has recently been added to tlie Entomological collection 

 of the Museum, two species of Aquatic CoUembola, representing 

 two distinct genera — Isofoma, Bourlet, and Achorutes, Templeton. 

 Of these, which are apparently undescribed, the first was collected 

 by Professor T. W. E. David, B.A., one of the Trustees of the 

 Museum, at the Yarrangobilly Caves, and the other by my friend 

 Mr. S. J. Johnston, B.Sc, fi-om a pond at Bathurst. 



In respect of the first which I name, Ixotoma troylodytica, my 

 colleague, Mr. C. Hedley, hands me the following interesting 

 observations : — 



" Deep in one of the western Yarrangobilly Caves Hows a sub- 

 terranean brook, in a pool of which and on wet stones around it 

 the guide pointed out to Messrs. Hamlet, Andrews and self, the 

 jHotoma. It occurred in large numbers but seemed confined to 

 one locality. Its movements were sluggish, and so far as we 

 could see, the brilliant magnesium-wire light carried by the 

 guide, produced no effect upon it. 



So curious an animal of coui-se appealed to my collecting appe- 

 tite, but proceeding to gattier some, the caretaker reminded me of 

 the wholesome regulation that no specimens are to be removed 

 from the cave reserves excejit by permission of the Department. 

 A few months later Prof. David visited the caves and as the 

 Department would probably relax their rule in his favour, I 

 handed to him a tube of alcohol and commended the subterranean 

 ' insects ' to his favourable attention. How kindly he fulfilled 

 this mission Mr. Rainbow's paper will tell." 



Family DEGEERIAD^. 

 (tphkh Isotoma, Jioinlef. 



ISOTOMA T1!0(;L0DYTICA, ifp. not: 



(Figs. 49, 50). 



Length, 1"2 mm. Colour, creamy white. Head. — Clothed 

 with a few fine short hairs. A'lih'nncf. — Short ; less than length 

 of head. Poiff-Anfeniial Oryau. — Oval. Ocelli. — Eiglit on each 



