43 



on the trunks and branches. The average number of sexual individuals 

 arising from one of these appears to be six. These forms take no food, 

 and after mating the female deposits a single egg. The stem-mother 

 from this egg makes its way to the young leaves of the poplar where 

 it settles down on a petiole and a gall begins to form about it. 



The second part of this paper, by C. P. Gillette, consists of descrip- 

 tions of the stages of P. populi-transversus and its gall. 



Pemberton (C. E.) & WiLLARD (H. F.). Work and Parasitism of the 

 Mediterranean Fruit-fly in Hawaii during 1917. — JL Agric. 

 Research, Washington, D.C., xiv, no. 13, 23rd September 1918, 

 pp. 605-610. [Received 2l8t November 1918.] 



Information with regard to the extent of infestation of fruit in 

 Hawaii during 1917 by the Mediterannean fruit-fly {Ceratitis capitata, 

 Wied.) and of the extent of parasitism of this species is given in tabulated 

 form, following the procedure of previous years [see this Review, 

 Ser. A, vi, p. 167]. A comparison of the efficacy of the various parasites 

 of C capitata has already been given [see this Review, Ser, A, vi, pp . 

 184, 185]. The total parasitism by all species during 1917 was 14*3 

 per cent, higher than in 1916. 



Chapais (J. C). Notes on the White-marlced Tussock JUloth.— Tenth 

 Ann. Rept. Quebec Sor. Protection Plants from Insects & Fungous 

 Diseases, 1917-1918; Quebec, 1918, pp. 23-24. [Received 23rd 

 November 1918.] 



This is a popular account of this well known pest of orchards and 

 forest trees in Canada. 



Bryce (P. I.). Some Injurious Insects of Ste. Anne de Bellevue, 1917. 



— Tenth Ann. Rept. Quebec Soc. Protection Plants from Insects & 

 Fungous Diseases, 1917-1918; Quebec, 1918, pp. 46-48. [Received 

 23rd November 1918.] 



Meromyza americana (greater wheat -stem maggot) caused consider- 

 able injury to wheat and barley. The larvae and pupae are found 

 near the heads, generally under the sheathing-leaf, inside the hollowed- 

 out stem. Pupation takes place about 25th July, adults emerging 

 by 8th August. Mayetiola destructor (Hessian fly) did some damage 

 to spring wheat. Maize showed damage to the leaves resembling 

 that caused by Sphenophorus inaequalis (corn bill-bug). 



Vegetable and root crop pests include Phorbia {Chortophila) 

 hrassicae (cabbage root maggot), which was checked wherever card- 

 board discs were used. During June, Epitrix cucumeris (potato flea- 

 beetle) occurred on potatoes and Crepidodera helxines on willow ; Phyllo- 

 treta armoraciae (horse-radish flea-beetle), P. sinuata and P. vittata 

 (turnip flea-beetles), Haltica clialybea (grape-vine flea-beetle) and 

 Psylliodes puncluhta. (hop flea-beetle) also occurred. Leptinotarsa 

 decemlineata (Colorado beetle) was abundant, but was controlled by 

 poisoned Bordeaux spray. The predaceous Pentatomid, Perillus sp., 

 was found feeding on it in considerable numbers. Depressaria hera- 

 ■cliana (parsnip web- worm) occurred on the flower-heads of parsnips. 

 €eramica {Mamestra) picta (zebra caterpillar) was abundant on 



(C538) A.2 



