716 SUMMARY OF CURRENT RESEARCHES RELATING TO 



decern! ineata, which he subjected to " centrifugal force." The older the 

 egg the more chances there are of its normal development after centri- 

 fuging, and the general result of the experiments is to show that these 

 highly-organized eggs may have their contents profoundly disturbed 

 without preventing the production of a normal embryo. The cyto- 

 plasm and the nuclei of centrifuged eggs are forced out of their usual 

 positions, but often normal development takes place. A high degree 

 of organization does not prevent the egg from adapting itself to changed 

 conditions. 



Myiasis Narium.*— A. W. Blain reports a case of human myiasis in 

 the nose, due to the maggots of the screw-worm fly (Compsomyia 

 macellaria). A fly entered the nose and laid its eggs. Twenty-five 

 maggots were removed. It seems that this parasitism is by no means 

 rare in man. Yount records twenty-three cases occurring in Arizona in 

 one year (1905) ; eighteen showed nasal myiasis, and five in some other 

 site. For the nasal cases alone the mortality was over 22 p. a, which is 

 enough to demonstrate the serious nature of the disease. The screw- 

 worm fly also attacks horses, sheep, and cattle. 



New Cordylobia.t — E. E. Austen describes Cordijlobia prsegrandis 

 sp. n., from Cape Colony, Natal, and Rhodesia, specially interesting 

 because the other members of the genus are, in their larval stages, 

 subcutaneous parasites in Mammals. The larvae of G anthropophaga 

 Grtinb., and G. rodhaini Gedoelst., regularly attack man. 



Larvae and Pupae of West African Culicidae.if: — W. Wesche has 

 done a most useful piece of work in giving a precise, but not too tech- 

 nical, description of a large collection of mosquito larvae and pupae made 

 at Lagos, by W. M. Graham. He deals with twenty-nine species, and 

 gives valuable keys to both larvae and pupae. There is a clear in- 

 troduction dealing with the characters of the important parts, and 

 Graham adds a number of field-notes and an appendix on collecting. 

 Fifty-three mosquitos have now been found at Lagos. 



Subdivisions of G-enus Phora.§ — J. R. Malloch has tackled this 

 genus which includes such a large number of species. He proposes to 

 recognize eight sub-genera, five of which are defined for the first time. 



Flies as Disseminators of Typhus. || — E. Bertarelli submits the 

 results of experiments which go to show that house-flies share in the 

 dissemination of typhus germs. He points out that cleanliness of rooms 

 and floors is of more importance than anything else. 



Hemiptera Injurious to Cocoa.lf — G. C. Dudgeon discusses a species 

 of Helopeltis from the Gold Coast, the immature form of which punctures 

 the pods of cocoa, and Sahlbergella theobroma Distant, which perforates 

 the stems and does great damage. 



* Rep. Michigan Acad. Sci., xi. (1909) pp. 114-15 (3 figs.). 



t Bull. Entornol. Research, i. (1910) pp. 79-81. 



% Tom. cit., pp. 7-54 (7 pis.). 



§ Glasgow Nat., i. (1909) pp. 24-8. 



|| Centralbl. Bakt. Parasitenk., liii. (1910) pp. 486-95. 



f Bull. Entornol. Research, i. (1910) pp. 59-61 (1 pi.). 



