HYMENOPTEROUS PARASITES OF COCCID^. 257 



from an uncertain species — rendered "Diaste" by D. T. — of 

 this genus. 



« 17. Diaspis rosce, Bche. 



This has been often parasitised : by Aphelinus diaspidis, How. 

 (Revis. p. 26) ; by Aspidiotiphagus citrimis, How. {l. c. p. 31) ; by 

 PJueiiodiscus [Encyrtus] ceneus, Dalm., which was bred from it in 

 Austria by Mayr (Verb. z.-b. Ges. 1875, p. 758) ; by Aphycas 

 brunneus, How. (Descr. N. A. Chal. p. 17) ; by Arrhenophagus 

 chionaspidis, Aur. (Ent. Tidsk. 1888, p. 146) ; and by Coccohius 

 diaspidis, Ashm. (1900, p. 408), at Washington. The synonymous 

 Aidacaspis (Aspidiotus) rosce is said by Ratzeburg (Ichn. d. Forst. 

 iii. 196) to have been bred by Bouch6, and to have produced 

 Coccohius notatus ; Gaulle (Cat. 26) quotes Cameron (Brit. Phyt. 

 Hym. iii. 233) in saying that the Cynipid Allotria erythrothorax, 

 Htg,, preys upon it. Newstead does not determine the Encyrtus 

 (Mon. Brit. Cocc. i. 31) which causes the female to swell and the 

 skin to become " highly chitinised." 



18. Diaspis carueli, Targ. 

 This is one of the four hosts given by Howard (Revis. p. 25) 

 for CJialcis {Aphelinus) inytilaspidis, Baron. 



19. Aulacaspis pentagona, Targ. 



Like A. rosce above, this species is given by Howard (Revis. 

 p. 31) as attacked by Aspidiotiphagus citrinus. 



20. Chionaspis eleagni, Green.* 



C. eleagni is a host of Physcus variicornis, according to Howard 

 (Revis. p. 43). 



21. Chionaspis salicis, Linn. 



The Tridymid, Tritypus areolatus, is said by Ratz. (Ichn. iii. 

 227) to have been bred by Hr. Nordliuger from a Coccus on Salix 

 aurita, from which the parasite emerged through a lateral hole. 

 Arrhenophagus chionaspidis is said by Aurivillius (Ent. Tidsk. 

 1888, p. 146) to have emerged from this species (quoted by Ashm. 

 p. 409), and Gaulle gives (Cat. 100) Habrolepis zetterstedti, 

 Westw., as also attacking it. From a species of Coccid on willow, 

 but unnamed, Ashmead says (p. 393) that Microterys bolus, Walk., 

 has been bred at Hudson's Bay. 



22. Chionaspis graminis, Green.* 

 From this species Howard (Proc. U. S. Nat. Mus. 1896, p. 637) 

 records his Encyrtus chionaspidis, from Ceylon (placed in the 

 genus Addencyrtus by Ashm. p. 402), as well as his Procto- 

 trypid Anthemus chionaspidis {I. c. p. 643). 



(To be continued.) 

 ENTOM. — OCTOBER, 1909. Y 



