180 



Cervidae and certain allied families of ruminants, such as the prong- 

 horn antelope, Antilocapra americana. The larvae cling by their spines 

 and mouth-hooks to the mucous membranes and feed on the mucus 

 secreted as the result of the irritation caused. On reaching the 

 second stage they penetrate further and have been found in the 

 nares, nasal and frontal sinus, eustachian tubes, pharynx, lungs, 

 etc. ; in the gullet and throat they occupy pouches formed by them 

 to escape being swallowed. 



Only three species are recorded from America, C. pratti, known both 

 in the adult and third-stage larva, G. phobifer, known only in the 

 adult stage, and C. macrotis, known only in the third-stage larva, the 

 last two being probably the same species. 



The larvae recorded from the nasal passages of man in California 

 are third-stage screw-worms, CJirysomyia {Cochliomyia) macellaria, F., 

 while those from the throat of pigs in Virginia do not belong to any 

 known genus. 



Hirst (S.). Remarks on Certain Species of the Genus Demodex, Owen 

 (the Demodex of Man, the Horse, Dog, Rat, and Mouse.) — Atm. & 

 Mag. Nat. Hist., London, xx, no. 117, September 1917, 

 pp. 232-235. 



Descriptions are given of Demodex folliculorum, Simon ; D. caninus, 

 Tulk., nimierous specimens being taken from a dog suffering from 

 the disease induced by this species ; D. ratti, Hahn., very abundant 

 in the skin of Mus rattus norvegiciis ; D. musculi, Oudms., in tame 

 mice ; and D. equi, Raill., causing a definite skin disease in horses. 



BosTiN (S. L.). Notes : Eucalyptus Trees and Malaria. — Agric. Jl. 

 India, Agric. Research Institute, Pusa, Calcutta, xii, no. 3, July 

 1917, p. 495. [Received 20th September 1917.] 



The author, writing in the " Scientific American " refers to the 

 practice, common during the latter part of the nineteenth century, 

 of planting blue-gum or eucalyptus trees in malarious districts under 

 the impression that the essential oil produced by the leaves would 

 counteract the supposedly poison- laden vapours rising from the 

 swamps. Although this idea was dispelled by the discovery that 

 malaria is a mosquito-borne disease, the fact remains that eucalyptus 

 planted in a malarial district can and does stamp out the disease 

 by absorbing so much water during its pecaliarly rapid growi;h that 

 pools and marshy places disappear, and with them the breeding- 

 places of the mosquito. 



Mitchell (J. A.). Typhus Fever (" Black Fever " or "Mbetalala ") in 

 the Cape Province.— Med!. Jl. S. Africa, Johannesburg, xii, no. 12, 

 July 1917, pp. 189-192. 



An anomalous fever, occasional outbreaks of which have been 

 reported in the Cape Province since 1900, has now been proved, on 

 clinical and epidemiological grounds, to be a form of typhus. The 

 usual measures against lice are included among those recommended 

 against this disease. 



