lO KANSAS UNIVERSITY QUARTERLY. 



Aspidiotus parniciosus Comst. Plate IV, Fig. iS; Plate V, Figs. 19, 20, 



21, 22, 2 J, 



The variations in the anal plate of female are greater than in 

 any of the specimens of any species studied. In fact it was the 

 exception to find one specimen having the structure of the two 

 sides identical. The relative size of the chitinous processes be- 

 tween the first and second lobe remained the same, "close together 

 and of nearly equal size," but these rarely ever appeared under the 

 microscope at same focal point — that is, the relative sizes of the 

 two could be gained only by focusing up and down. Dorsal 

 glands uniforml}- few in number, small plate just laterad of second 

 incision alwaN's present. 



A large number of individual mounts have been studied and 

 sketches of many made to illustrate their structures. 



The scales of this group are uniformly dark, in man}' cases black, 

 the white secretion covering the exuvict of male is scant, in some 

 cases almost wanting, leaving the black sculptured ring and dot, 

 resembling description of ./. andronwlas. Others, however, have 

 the dot and ring fairly well marked. 



The anal plate of female has presented many interesting fea- 

 tures. Fig. I may be considered as an extreme. Very few indeed 

 show the forks in plates so marked as the}' appear at a. This 

 figure farther shows two plates caudad first incision, serrate, in 

 this the specimen is normal. The irregularly shaped plates pres- 

 ent on left side at b, between spines four and five, and absent 

 entirely on right has been frequently observed. This figure further 

 shows the inconspicuous plates between the median lobes. Their 

 absence in some specimens examined could be satisfactorily ex- 

 plained by their being broken in course of preparation. 



Fig. II may be taken as an average, shows only one plate caudad 

 of first incision and this plate forked. 



Laterad of spine four is another spine; this is unusual. Between 

 spines four and five (not counting incidental spine) are two irreg- 

 ular plates on right and three on left. 



Fig. Ill represents a left side of one specimen and a right side of 

 another transposed and placed beneath for illustration of variations 

 in structure of the two sides. 



Figs. IV and V represent other individuals studied. 



Newly born nymph. This agrees with description given by 

 Howard and Marlatt in every respect save one. Their description 

 reads: "The large central plates each terminate in a long hair." 

 In the twenty nymphs examined the long hairs are not connected 



