296 NATURAL SCIENCE. Oct., 1895. 



the Bryozoan (Coralline) Crag, as it was detected beloiv the " White Crag " in a pit 



dug at Ramsholt, but long ago filled up. As this earlier Crag is more locally 



deposited, the phosphate bed is usually between the Red Crag and the London 



Clay. It has yielded remains of many land animals of the Miocene or Oligocene 



periods, which would not be represented in our museums had it not been for the 



discovery of the commercial value of the nodules. The late Mr. Charlesworth was 



good enough to let me see all that passed through his hands, so that at one time I 



was able to make a tolerably complete set of water-colour drawings of the mam- 



mahan fossils of this bed, including Hipparion, Rhinoceros, Mastodon, and Ceiviis. 



They have never been published. 



George Henslow. 



A Plague for Locusts. 



To supplement the note on this subject {ante, p. 152) by Miss Smith on the 

 fungoid destruction of locusts in Natal, I may state that I observed a similar 

 mortality among Orthoptera at the same time in this neighbourhood of the 

 Transvaal, showing that the " locust epidemic" must have covered a wide area 

 between here and the coast. 



On this occasion the insects attacked were smaller species of Acridiidae, 

 belonging to more than one genus, and were only found on the leaves of Acacia 

 mollisshna, an Australian wattle, the bark of which, as grown in Natal, produces a 

 higher percentage of the tannin principle than it does in its original habitat. These 

 Orthoptera had died clinging tenaciously to the leaves, and were with difficulty 

 detached after death, as was the case with the Durban locusts. 



I may add that our last locust swarms here were composed of a different species 

 to the Pachytylus migratoroides, Reiche, the ordinary South African scourge, and the 

 one solely constituting the vast hosts observed here previously by myself in iSgt. 

 This year we were visited by a larger species with a redder coloration, which I hope 

 to identify on my return to England. 



Pretoria, W. L. Distant. 



August, 1895. 



ERRATA. 



We regret that, because the corrected proof went astray in the post, several 

 mistakes appeared in Mr. Carpenter's article " Some Recent Insect Literature" in 

 our last number. The principal corrections to be made are : — 

 P. 180, for Gibelbula read Libelhda. 



„ ,, Planipeunia read Planipennia. 

 ,, ,, Tricoptera ,, Trichoptera. 

 ,, 182, ,, sunflies ,, sawflies. 



,, 183, ,, pupillae ,, papillae. 



,, de Saumere ,, de Saussure. 



NOTICE. 



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To the Trade. — Natural Science is published on the 2^th of each 

 month ; all advertisements should be in the Publishers' hands not later than the 

 10th. 



The " Challenger " Number. — In reply to enquiries, ive remind our 

 readers that, although the First edition of this ran out of print immediately, 

 there are still some copies of the Second edition to be obtained ai the usual price — 

 One Shilling. No more ivill now be printed, so orders should be sent at once. 



