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IX The development of Ceroplastes roseatus, Towns, and 

 Ckll. By Chas. H. Dolby-Tyler, F.E.S., British 

 Consul, Panama. 



[Read May 3rd, 1899.] 



Plate VIIL 



Ceroplastes roscattts, Townsend and Cockerell (Journ. New 

 York Entom. Soc, vol. vi, p. 176, September 1898. 

 Eef. Ann. and Mag. Nat. Hist., ser. 7, vol. iii, p. 167, 

 February 1899). 



On the suggestion of Professor Cockerell, to whom I am 

 much indebted for kind encouragement and assistance 

 in prosecuting my study of the Coccidse, I undertook in 

 December last to record the development of the exceed- 

 ingly pretty species that forms the subject of the present 

 paper. . 



Upon leaving the parent scale the young msects crawl 

 for a short distance along the branch or twig and settle 

 down almost immediately. Having placed some upon the 

 upper surface of a leaf, they wandered over it for upwards 

 of three hours, and eventually reached the twig whereon 

 they fixed at once. 



Twenty-four hours after fixation three famt mealy 

 secretions appeared upon the head, thorax, and abdomen 

 respectively, and during the following six hours assumed 

 definite form; the cephalic patch being sub- cylindrical 

 and higher than the rest; the thoracic patch divided 

 transversely into three ridges representing the pro-, meso-, 

 and meta-thoracic terga— the first being somewhat of a 

 shallow inverted horse-shoe shape; and the abdominal 

 patch was divided into seven distinct transverse ridges, 

 narrowing posteriorly, which represented the visible 

 tergites. ° Ten hours later, or forty after fixation, appeared 

 the'^first indications of the marginal plates— so conspicuous 

 in the advanced larval condition— in the form of two 

 minute irregular patches of secretion situated upon the 

 margin on either side of the thorax close to the pro- and 

 meso-thoracic, and the meta-thoracic and abdominal sutures 

 (Plate VIII, fig. 1). The colour of the insect's body, which 

 TilANS.ENT.'sOC.LOND. 1899.— PART III. (SEPT.) 19 ^ 



