451 



California from the wingless progeny of spring migrants and the third 

 and fourth generations yielded a large percentage of autumn migrants. 

 A diagram of the complete life-cycle of E. pyricola is given. 



Gatenby (J. B.). The Embryonic Development of Trichogramma 

 evanescens, Westw,, a Monembryonic Egg Parasite of Donacia 

 simplex, F. — Qtrly. Jl. Micros. Sci., London, Ixii, no. 2, February 

 1917, pp. 149-187, 3 plates. [Received 9th August 1917.] 



This paper contains an account of the embryonic development of 

 TricJiogrnmma evanescens, which oviposits on the egg-mass of the 

 Chrysomelid beetle, Donacia simplex, a single parasite emerging from 

 one host-egg. 



HuTSON (J. C). Some Soil Grubs in the West Indies. — Agric. News, 

 Barbados, xvi, no. 396, 30th June 1917, p. 202. 



The root-borers included under this heading were mentioned in the 

 previous issue [see this Review, Ser. A, v, p. 420]. The present paper 

 deals with the other group of soil grubs, known as hard-backs. These 

 include the Melolonthids, Phytalus smithi and an unidentified species 

 of Lachnosterna, and the Dynastids, Ligyrus tumulosus and species of 

 Cyclocephala, Strategus and other allied genera, some of which are 

 scavengers in the larval stage. With the exception of Ligyrus tumu- 

 losus, these beetles are not attracted to lights, but must be sought in 

 the fields at night. The two species causing most damage at present 

 are Phytalus smithi (Barbados brown hard-back) and the Antigua 

 brown hard-back, which is an unidentified species of Lachnosterna. 

 Against the former, a vigorous campaign is being carried out, the 

 adults being collected in thousands in the fields at night. An account 

 of the latter has appeared in a previous paper [see this Review, Ser. A, 

 V, p. 330]. 



Clutterbuck (C. G.). Notes on the Codling Moth {Carpocapsa pomo- 

 nella, L.). — Proc. Cotfeswold Nat. Field Club for 1915, Gloucester, 

 xix, part 1, December 1915. [Received 11th August 1917.] 



The author records a case of larvae of Cydia {Carpocapsa) pomonella 

 having been parasitised by the Tachinid fly, Blepharidea vulgaris. 

 B. vulgaris is usually recorded as a parasite of Abraxas grossulariata 

 (gooseberry moth) and has not, to the author's knowledge, been 

 previously recorded as parasitising C. pomonella. 



Farmer (J. B.). Scientific Assistance. Its Importance on the Planta- 

 tion. — Planters' Chronicle, Bangalore, xii, no. 29, 7th July 1917, 

 pp. 340-344. 



The author, in an article in " The Rubber World and Financial 

 Advei-tiser," reproduced in this paper, calls attention to the importance 

 of scientific organisation and its application to the great plantation 

 industries, and advises the establishment of a central institute, similar 

 in general character to the Imperial Bureau of Entomology, for the 

 study of plant pathology and for promoting scientific efficiency on 

 plantations in the tropics. Both chemical and biological problems 



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