Development of Ceroplastes roseaius. 271) 



appeared to be arrested, or advanced in an imperceptible 

 degree. Three days subsequently the abdominal secretion 

 had attained a height of "50 mm., and the insect pre- 

 sented the appearance given in Fig. 2, a, h. At this stage 

 the shallow perpendicular fluting and horizontal strige of 

 the abdominal tuft were more pronounced than at any other. 



Eight days later the pre-caudal seta?, which up till then 

 were constant, had disappeared, and the surface of the 

 lobes was sparsely sprinkled with secretion ; the tubercles, 

 three on either side subdorsally, and one cephalad, all 

 co-equal in size, could just be distinguished ; while the 

 anal plates had fused into a sub-cylindrical spine. 



Four days afterwards the insect presented a somewhat 

 flattened convex, ovate appearance ; the marginal tufts 

 appearing as a broad raised band, narrowed caudad, divided 

 by deep indentations into light distinct plates (Fig. 3), 

 there being one cephalad composed of the cephalo- 

 marginal, cephalic, and first pair of lateral tufts ; three 

 lateral pairs, the last of which was formed through 

 evalescence of tufts 4, 5 ; and one caudad made up of 

 No. 6 and the precaudal tufts and surface secretions. The 

 dorsal tufts had united forming a compact ovate, truncate, 

 conical mass, and a faint secretion appeared between this 

 and the marginal plates. The first step towards the 

 elaboration of true wax was now apparent, the substance 

 of all the plates being consolidated, each one showing 

 a disappearing apical tuft of primitive secretion. 



From this period for the ensuing eight days no apparent 

 external growth of secretion was visible ; meanwhile, how- 

 ever, the elaboration of true wax continued, and at the 

 expiration of this period the base of each plate was 

 composed of a homogeneous mass of pink-hued wax, and 

 the interstices half filled with it, so that the insect's body 

 was now completely hidden from view with the exception 

 of the anal process, a small portion of which projected 

 through the waxy covering. 



Five days later the fusion of secretion had much 

 advanced, the whole test was widened and nearly circular. 

 Seen from above the central plate appeared slightly 

 polygonal, somewhat longer than broad, and viewed in 

 profile, laterally, its apex is seen to be inclined cephalad. 

 The marginal plates are conical and the caudal plate, the 

 growth of which appears to be arrested mediad, has com- 

 menced to merge on either side into No. 3. 



