198 



A. spinosus. From bred insects it was found that eggs laid in June 

 hatched in August and the winter was passed in the larval stage, during 

 which time four moults occurred. Pupation took place in the middle 

 of May of the following year and the adult appeared at the end of the 

 same month. The eggs of the locust, Oxya intricata, Stal, were used 

 as baits for the larvae. 



Green (E. E.). On a New Species olAntonina (Coccidae) from Ceylon. 

 — Entom. Mthly. Mag.. London, (3) v, no. 56, August 1919, 

 pp. 175-176, 2 figs. 



Antonina zonata, sp. n., here described, was found on bamboo 

 {Teino tachjum attenuatmn) in Ceylon. The adult females are clustered 

 in the axils of the smaller branches and are almost enclosed by shelters 

 constructed over them by ants, Cremastogaster dohrni. The male 

 puparia are usually concealed beneath the stipules of the bamboo. 



King (H. H.). The Dura Asal Fly {Aphis sorghi, Theob.) in Dongola 

 Province, Anglo-Egyptian Sudan. — Wellcome Trop. Res. Lab., 

 Khartoum, Entom. Bull. 2, [n. d.] 14 pp. [Received 28th 

 February 1920.] 



In the northern provinces of the Sudan Aphis sorghi, Theo., is 

 almost exclusively found on dura {Sorghum spp.) and garowi {Andro- 

 pogon halepensis) grown near the river banks. Although it will attack 

 Eragrostis major and Panicum isachne, it cannot thrive on these grasses 

 for very long. 



In the district under consideration reproduction is entirely partheno- 

 genetic, but in cooler and damper regions sexual forms probably occur. 

 Immediately after birth the larva pierces the tissue of the leaf and 

 beo-ins feeding on the sap. After four moults in the course. of 5| to 

 7 days, the mature females, either alate or apterous, appear. The 

 apterous individuals start reproducing a few hours after the last 

 moult, but the alate forms migrate to fresh positions, giving birth 

 to from 6 to 12 young wherever they settle. The reproductive 

 period of wingless forms varied from 13 to 20 days under 

 laboratory conditions with a progeny of from 65 to 103, and that of 

 the winged forms from 15 to 25 days with a progeny of from 39 to 72. 

 The proportion of winged and wingless individuals depends largely 

 on the condition of the food-plant. Should the plant become sickly 

 or begin to dry up, the proportion of apterous females becomes larger. 

 The Aphids are probably carried to a very small extent by the running 

 water of the irrigation channels and also to a certain extent by ants. 



The natural enemies include Coccinellids, a lacewing fly, a Dipteron 

 and at least one species of Hymenopterous parasite. 



The starving out of Ajjhis sorghi is advocated as a remedial measure. 

 This may be effected by uprooting and burning all dura stumps 

 immediately after the demeira crop {i.e., that started after the Nile 

 flood is estabUshed) has been harvested, and keeping the land entirely 

 free from dura and garowi until the next demeira crop or at least until 

 the summer crop is sown. To be effective these measures would have 

 to extend over the entire Province. 



