323 



Newst., on Ficus orbicularis, on milkwood tree and on an undetermined 

 introduced tree ; A. unilobis, Mask., on M. leucadendron ; A. 

 (Aonidiella) ininiatae, sp. n., on twigs of Eucalypttis miniata ; A. 

 (Aonidiella) subcuticularis, sp. n., on the leaves of Ficus orbicularis ; 

 Porogynvnaspis rufa, gen. et sp. n., on leaves of P. odoratissimus ; 

 P. angulata, gen. et sp. n., on P. odoratissimus ; Chionaspis dilatata, 

 Green, on P. odoratissimus ; C. graminis, Green, var. near divergens, 

 on grasses ; Hemichionaspis 7ninor, Mask., on Grevillea heliosperma 

 and sisal hemp ; H. pseudaspidistrae, sp. n., on P. odoratissimus ; 

 Lepidosaphes incisor, sp. n., on M. leucadendron ; L. hemichionaspi- 

 f or mis, sp. n., on M. leucadendron and heavily attacked by a red 

 parasitic fungus ; Leucaspis japmiica var. darwiniensis, var. n., on 

 fohage of Ficus orbicularis ; Fiorinia acaciae, Mask., on Acacia sp. ; 

 Saissetia (Lecanium) nigra, Wietn. ; Pulvinaria psidii. Mask. ; Asterole- 

 canium Jiilli, sp. n., on fohage of the palm, Livistona humilis ; Sphaero- 

 coccus diaspidiformis, sp. n., on leaf-stalks of L. humilis. 



Cameron (A. E.). Some Experiments on the Breeding of the Mangold 

 Fly {Pegomyia hyoscyami, Panz.) and the Dock Fly {Pegomyia 

 bicolor, Wied.) — Bull. Entom. Research, London, vii, no. 1, May 

 1916, pp. 87-92, 2 figs. 



The food-plants of Pegomyia hyoscyami, Panz., belong mainly to the 

 famihes Chenopodiaceae and Solanaceae, although the Caryo- 

 PHYLLACEAE and CoMPOSiTAE may also be attacked. The dock is not 

 a host plant of P. hyoscyami, but of an allied species, P. bicolor, Wied. 

 The leaves of dock are also mined by P. nigritarsis, Zett. Experiments 

 carried out in 1912 and 1913 to ascertain whether adults of P. hyoscyami, 

 reared from larvae fed on belladonna leaves, would oviposit on leaves 

 of mangolds met with negative results. [See this Review, Ser. A, ii, 

 pp. 616-618.] The experiments were repeated in 1915 on a larger 

 scale. Sugar-beets were sown in some compartments and mangolds 

 in others ; the plants were kept free from weeds throughout the 

 summer. In the first compartment, in which sugar-beets were sown, 

 P. bicolor reared from Rumex obtusifolius was hberated ; in the second 

 and third, both sown with sugar-beet, were liberated P. hyoscyami 

 reared on belladonna and on mangolds respectively. In the last two 

 compartments, sown with mangolds, were placed P. bicolor reared from 

 dock and P. hyoscyami from belladonna. The insects were introduced 

 between 22nd June and 3rd September. Oviposition was first observed 

 on 9th August, on the part of females in the last cage. By 3rd 

 September the leaves were badly blistered by the larvae. The following 

 conclusions were reached as the result of these experiments : — (1) 

 P. hyoscyami reared on belladonna will oviposit and complete its life- 

 history on mangolds if belladonna is absent. (2) P. hyoscyami reared 

 on mangolds did not oviposit on sugar-beet. (3) P. bicolor reared on 

 dock did not oviposit and complete its hfe-history on mangold or 

 sugar-beet. It may be assumed that P. hyoscyami reared on mangold 

 or sugar-beet will not oviposit on dock. (4) A careful examination of 

 bhstered leaves of weeds and cultivated plants must be made before 

 asserting that damage is due to either of the above species. Cheno- 

 podium album (goosefoot) is definitely known to be attacked by 

 P. hyoscyami, but the occurrence of a migration from this plant to 

 mangolds has not yet been estabhshed. 



(C285) a2 



