368 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



second stages are first white, then chestnut-color, then azure black, 

 and finally black. 



The second-stage larva (fig. 10, No. 2) measures in length from 

 0.4S to 0.57 mm. and in width from 0.39 to 0.45 mm., and in the shape 

 of its body comprising that of the logs is similar to the fourth stage of 

 the larva which is described below. Around the margin of its body 

 it has a fringe of wax formed of slender ribbon-Uke points whose 

 length is 0.084 mm. and whose width is 0.009 mm. These at their 

 apex are less separated from one another, while at the proximal part 

 each of them is in contact with the one preceding and with the one 

 following. The larva of the second stage differs from that of the 



^xj|f(^!!ijt!^,. 



Fig. 10.— Aleurolobus ouvinus. Immature stages: 1, First stage; 2, second stage; 3, pupa case; 

 4, ventral view of pupa case. (After Silvestri.) 



first stage in color, in size, in the form of the antennae and of the 

 legs, and by the absence of the four dorsal bristles. 



The larva of the third stage is similar to that of the second and 

 of the fourth, and presents the following dimensions: Length from 

 0.75 to 0.93 mm., width from 0.67 to 0.81 mm. 



Larva, fourth stage. — (fig. 10, No. 3.) The body is greatly de- 

 pressed, almost laminate. Its length somewhat exceeds its width. 

 The dorsum is black, provided with two tufted obhque transverse 

 lines formed of white wax upon the marginal part of the cephalo- 

 thorax some distance behind the level of the compound eyes and one 

 narrow longitudinal line also consisting of white wax upon the 

 median posterior part of the body behind the operculum. Around 

 the margin there is found a fringe of wax hke that found on the larvae 

 of the second and third stages; but in this larva of the fourth stage 

 this fringe is more or less broken up, and during the winter for the 

 most part is lost entirely. 



The color of the venter (fig. 10, No. 4) is dark green in the central 

 portion and black in the marginal portion, with a narrow lateral 

 waxy area at a level with the base of the second pair of legs. This 

 area close to this same pair of legs bifurcates and its branches join 

 the two stigmata. Another area composed of wax exists in the pos- 

 terior part of the body. Length of the female from 1.68 to 1.75 mm.; 



