NOTBIS AND EXHtBITIONS 275

The variations are not indications of the condition of the herd, as the catch may be affected by the time of arrival of the sealing crews, by the weather and by ice conditions on the beaches, in particular on the S.W. side of the island.

Totd oil output is 204,373 barrels giving a seasonal average of 10,756.5 barrels and a variation from 6,572 in 1942 to 12,295 in 1937. The grand average is 1,942 barrels per seal var,ying from 1.647 in 1942 to 2.046 in 1937. It seems reasonable to assume that the variations from season to season are in part due to factors affecting $he amount or accessibility of the food supply during the winter migrations as well as a t South Georgia, factors which may he described as hydrological ; in this connection it is remarkable that 1930 provide3 five of the six monthly minimal averages.

Disregarding killings for August which appear only once and are very small (87 seals) Table 11 containing monthly catch and oil figures shows that September with 2.196 barrels per seal is the best month for average oil production and that i t is closely followed by October, the most important numerically, a t 1.996. Although i t is recognized that the output per seal is below the optimum in March, April and November, it has to be accepted that killings are necessary in these months to allow the annual quota to be taken. Moreover, any addition to the world supply of animal oil is important just now and it should be emphasized that t,he removal of surplus bulls is necessary for the welfare of this valuable herd-an aspect of the matter which is permanently kept in view.

The management of the sealers is deeply interested in producing the maximum amount of oil and can therefore be relied on to make every effort to take the animals when they are in their fattest condition, and it is a pleasure to state that the Compania Argentina de Pesca has a first-rate record of good faith and balanced outlook for the whole of its long sealing history.

REFERENCES. >IA'rTHCwS, L. H. ( 1929).

Ozr.oon, W. H., PREBBLE, E. A. and PARKER, G.H.,

T h e lvntitrnl Histori1 of the Eiephmit S P ~ . Diucovsry RepOrth,

The Fur Seal and other 1, p. 23.5 rt s p q , Cambridge.

life of the Pribilof Islands, .4laska, in 1914. (I9i6).

B?rll. U.S . Bur. Fish. 34, 1-172.

November, 1946.

New Larval Mites-Addenda. By CHARLES D. RADFORD.

The raising by Brennan, 11346 ( J . Parusit., 32, 2, 132) of the genus Cl)otici (type species Chalia srtosa Brennan, 1946) has revealed a close similarity with Hannemania ochotona Radford, 1942 (Parasitology, 34, 72) and Proc. zool. A'oc. Lond. 1946, 116, 585 which calls for clarification.

the tarsi arc provided with 3 claws ; chelicerae with a single, sub-apical tooth ; possessing paired eyes ; coxa iii with three spines. In figure 8 five spines are depicted in error on coxa iii.

In Chatia setosa the palpal claw is terminated in seven or more prongs ; tarsi with only two claws ; chelicerae with an inconspicuous sub-apical, dorsal tooth ; eyes single ; coxa iii with an irregular row of five to seven spines

The slides which are in the collection of the Rocky Mountain Laboratory, Hamilton, Montana, U.S.A. labelled Hannemanio ochotoiu~, Trombicub parkeri, Neoschongusticl guntheri and Neoschonga.stia .yarn honi arr hereby designated the lectotypes, whilst those in the British Museum (Natural History) are paratypes.

The British Museum slides labelled AcomaWrus theileri, A . thallomyia, A. gateri, Trombicula mastomyia, T . cynictk, T . hcsmertoni, T . abyssinica, T . praomyia, Neoachikgastia mirafra, N . aethomyia and N . otamyia are hereby designated the lectotypea.

In Hanncmrcnia ochotona the palpal claw is trifurcate ;

Lrcfo typs .

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