63 



grub, Xanthorhoe praefectata ; Mesostenus albopictus, a parasite of 

 C. unipuncta ; Lissopimpla semipunctata, a parasite of C. unipuncta and 

 Porina servinala ; Rhyssus fractinervis parasitising wood-boring beetles ; 

 and Entedon epigonus and Platygaster minutus, which have been 

 responsible for the control of the Hessian fly, Mayetiola (Phytophaga) 

 destructor, Say, in New Zealand. 



Predators of economic value include : Pompilus fugax and Polistes 

 tasmanicus. 



Injurious Hymenoptera include : the pear and cherry slug, Eriocamp- 

 oides limacina (cerasi), Sirex juvencus, which bores into conifer stems, 

 and Xiphydria accepta, the larvae of which burrow in living and dead 

 timber. 



Compatibility of Spray Mixtures. — N.Z. Jl. Agric, Wellington, xix, 

 no. 4, 20th October 1919, pp. 244-245. 



This is a summary of a paper by W. C. Morris, presented to the New 

 Zealand Institute Science Congress. Much of the information given 

 has previously been noticed [R.A.E., A., ii, 662]. Incompatibility of 

 sprays also refers to the order in which they are appUed to the trees, 

 thus lime-sulphur followed by lead arsenate has proved more effective 

 than when applied in the reverse order. Attention is drawn to the 

 danger of using second-hand casks from which the previous spraying 

 mixture has not been entirely eliminated. 



Davidson (W. M.). U.S. Bur. Entom. New Aphids from Oaks. — 

 Canad. Entom., London, Ont., li, no. 11, November 1919, pp. 245- 

 248, 1 plate. 



The new species, Vacuna californica on Quercus lohata and 

 Q. tnacrocarpa, Myzocallis quercifolii on Quercus douglasi (blue oak), 

 and Myzocallis californicus, Baker, var pallidus, n., on Quercus 

 dumosa are described from California. 



A key is given to the species of the genus Myzocallis. 



Fekris (G. F.). Notes on Coccidae — iv. (Hemiptera). — Canad. 

 Entom., London, Ont., li. no. 11, November 1919, pp. 249-253, 

 3 figs. 



The species dealt with in this continued list [R.A.E. , A. vii, 336] 

 include : Sphaerococcus casuarinae, Mask., on Casuarina quadrivalvus 

 in Australia ; Amorphococcus leptospermi, Mask., in a gall on Lep- 

 tospermum sp, in Austraha ; Kuwanina obscurata, Mask., of which 

 the penultimate and first stages are described from Eucalyptus in 

 New South Wales ; and Eremococcus, gen. n., erected for E. pirogallis. 

 Mask. 



Davis (J. J.). Correction (Aphididae). — Canad. Entom., London, Ont., 

 li, no. 11, November 1919, p. 263. 



As it has been brought to the author's notice that the genus 

 Heteroneura [R.A.E. A, viii, 8], suggested for the reception of Aphis 

 setariae, Thos., is preoccupied, the name Hysteroneura is proposed 

 in place of it. 



