138 



R. NEWSTEAB AND F. C. WILLCOCKS- 



APPENDIX I. 



CHARACTERS AND GENERAL MORPHOJ.OGY OF THE LEBBEK SCALE. 

 By E. Newstead, M.Sc, A.L.S., and F. C. Willcocks. 



Dactylopius * perniciosus, sp. n. (Newstead & Willcocks). 



Ovisac of female (see fig. 2, p. 124) . White, or rarely pale buff. Usually more- 

 or less reniform, rarely quite globular or more or less hemispherical ; surface 

 ynth well-marked transverse flutings and sometimes also with faint longi- 

 tudinal striae. The waxen plates and mealy secretion of the female are^ 



Fif»-. 10. — Dactylojniis 2>erniciosus, female; a, antenna; h, leg; c, d,e, spinnerets. 



often visible on the exterior, more especially so in the earlier stages of the- 

 formation of the ovisac. When quite intact it has a closely felted appear- 

 ance, but on the least disturbance the material is capable of stretching out 



* Fernald, Catalogue Coccidae of tlie World, p. 96, gives Pseudococcus, Westwood (1841) 

 priority. To adopt such a change in the nomenclature would lead to endless confusion in 

 the literature of Economic Entomology; and for this reason the name which has been so 

 long: in use has been retained. 



