Collection and Preparation. \ 3 



EXPLANATION OF PLATE L 

 Structural Characters of Female and Larval DL\sPiNyi':. 



Fig. I. Chionaspis, S and 9 scales. 



2. Aom'dt'a, S „ 9 „ 



3. Fiorinia, 6 „ 9 „ 



4. Diaspis^ 6 „ 9 „ 



5. Mytilaspis^ i „ 9 „ 



6. Par/a/on'a, S „ 9 „ 



7. Aspidw/us, S „ 9 „ 



8. 1st pellicle oi Aspidiotus, from below. 



9. „ Diaspis, „ „ 



10. Diaspis rosce, 9, ventral view. 



(a) head, (b) prothorax, (c) mesothorax, (d) metathorax. 



(L, IL, III.) abdominal segments, (IV.) 'pygidium.' 



(a) antenna;, (d) rostrum, (c) mentum, (d) anterior spiracles, (e) 



rostral setae, (/) 2nd pair of spiracles, (^<,') oval pores of tubular 



spinnerets, (/i) circumgenital glands. 



1 1. Antennae of adult 9 Diaspina:. 



(a) Fiorinia fiorinice, {b) Aspidioiiis osbeckta, {c) Aspidiotus 

 Ihnonti, (d) Chionaspis aspidistrcB. 



12. "Egg oi Diaspis. 



13. Antennas of larval DiaspincE. 



{a) Parlatoria zizyphi, {b) Diaspis boisdtivallii, (c) Mytilaspts 

 pomoruin^ {d) Aspidiotus fiats. 



14. Diagram of pygidium (combining characters of various genera of 

 Diaspinae). 



(a) Circumgenital glands, median group, {b) upper lateral groups, 

 {c) lower lateral groups, {d) genital orifice, {e) anal orifice, 

 (/) tubular spinnerets, trumpet-shaped, {g) filiform spinnerets, 

 (Ji) cylindrical spinnerets, (z) lobes, (7) marginal prominences, 

 {k) squames, fimbriated, (/) spine-like squames, (w) spines. 



15. Tubular spinneret, with glands. (Adapted from drawings by Berlese.) 



{a) Silk gland, {b) accessory glands (said to secrete varnishing or 

 cementing material), {c) capitate head of chitinous tube, {d) 

 chitinous tongue, communicating with silk duct, {c) chitinous 

 tube, connecting silk duct with the surface, (/) external orifice 

 of spinneret. 



16. Squames : {a) spiniform, {b) spiniform, with divided extremity, {c) 



with narrowly fimbriated extremity, {d) with broadly fimbriated 

 extremity, {e,f) laterally fimbriate. 



