1896.] 



MICROSCOPICAL JOURNAL. 



327 



cular, amounting practically to a flattened sac with indis- 

 tinct segmentation, and without organs, except a long 

 sucking bristle springing from near the center beneath. 

 The color of both sexes is light lemon yellow. The scales 

 are at this time of a decidedly grayish tint, overcast some- 

 what with yellow. 



Eighteen days from birth the males change to the first 

 pupal condition, the scales becoming an elongate oval, 

 the cast larval skin showing near the anterior end. The 

 male pro-pupse are very pale yellow, with legs and an- 

 tennae (which have reappeared) together with two of the 

 terminal segments, colorless. The eyes are dark purple 



Aspidiotus pernicious : Development of male insect; a, ventral view of laiva after first malt; 

 b, same, after second or pro-pupa sta^e : c and d true pupa, ventral and dorsal views . 



and placed close together. The antenna? are stout and 

 bent closely along the side of the body as far as the first 

 pair of legs where they curve inward. Prominent wing 

 pads extend along the sides of the body, the terminal 

 segment bears two short t^pines (fig. 5). 



The female undergoes a second molt about twenty 

 days from the larva. She is still yellow in color, of cir- 

 cular form, the greatest diameter being 0.56 mm. The 

 sucking bristles are very prominent. The last segment 

 at this stage has practically the characters of the mature 

 female, as follows (fig, 8) : There are two pairs of 

 lobes, the terminal ones largest and nearly three times as 



