Maskell. — On Aleurodidae. 411 



Fig. 12. SiJharococcus obscuratus, diagram of adult female. 



Fig. 13. „ antenna of adult female. 



Fig 14 „ wrinkles and chitinous bands of a.h^ff^\ p A }- 



men of adult female. XCs«^*^^C y 



Fig. 15. „ larva. /CS^^O^® *i^ ^ 



Fig. IG. „ antenna of larva. /-C*"-^ .P 



Fig. 17. „ gamasid mite parasite. 



Plate XXII I. ' 



Fig. 1. Icerya midata, adult female, side view. 



Fig. 2. „ adult female, dorsal view. 



Fig. 3. „ antenna of female. 



Fig. 4. „ foot of female. 



Fig. 5. „ diagram of larval spinnerets and marginal hair^. 



Fig. 6. „ antenna of larva. 



Fig. 7. Icerya rosce, var. austraUs, diagram of male larva. 



Fig. 8. „ antenna of male larva. 



Fig. 9. » adult male. 



Fig. 10. „ abdominal extremity of male. 



Fig. 11. „ antenna of male. 



Art. XXXIX. — Contributions towards a Monograph of the 

 Aleurodidae, a Family of Hemiptera-IIomoptera. 



By W. M. Maskell, Eegistrar of the University of New Zea- 

 land, Corr. Mem. Eoy. Soc. of South Australia. 



IRead before the Wellington PhUosopJncal Society, 26th February, 1896.] 



Plates XXIV.-XXXV. 



The attention of systematic entomologists has perhaps been 

 less directed to the Aleurodiclce than to any other family of 

 insects. The bibliography attached to this paper contains, 

 indeed, a fair number of names, but the majority of these 

 writers have either simply repeated the phrases of their pre- 

 decessors, or made only quite trivial observations, or mani- 

 fested but slight acquaintance with the family. The number 

 of species reported is exceedingly small ; and yet these insects 

 are found in almost every country, and infest a great variety 

 of plants, and it is certain that a little trouble on the part of 

 collectors and observers would discover a large number of 

 species now quite unknown. In this paper I shall include 

 more than twenty forms which I believe to be new. These 

 forms have come under my notice in connection with my 

 studies of the homopterous family of the Coccidce, most of 

 them having been sent to me as specimens of that family. 

 "Were I able now to do any collecting myself in New Zealand 

 (which unfortunately is not the case) I am sure that I could 



