386 Illinois State Laboratory of Natural History. 



1. Mi'CE Comstocki, on grape Eastern States. 



2. colo'atus Ckll., on Chilopsis New Mexico. 



3. tow7iseudi Ck.\l.,, Northern Mexico. 



4. comstocki Johnson, on sugar maple... Illinois and New York. 



The scale of coloratus is pale orange-brown, the exuviae 

 concolorous; that of comstockl cream-buff, the exuviae 

 variable; that of uvce light brownish, the exuviae yellow; 

 and that of townsendi grayish white, the exuviae pale 

 orange. In the lobes and plates, as also in the spin- 

 nerets, these forms are variable; but comstocJci is notice- 

 able for the comparatively large size of the second lobes. 



Aspidiotus sesculi sp. n. (Plate XXXI., Fig. 3; and 

 Plate XXXII., Fig. 1-3.) 



Scale of female. — The scale of the female is circular 

 (Plate XXXI., Fig. 3, c), rather convex, and varies in 

 diameter from 1.5 to 3 mm., averaging about 2.5 mm. 

 The general color of the scale is dirty gray, conforming 

 usually to the color of the bark to which it is attached. 

 The exuviae are usually a little one side of the center, 

 and covered with excretion. In rubbed specimens the 

 protuberance indicating the position of the exuviae is 

 orange-red and surrounded by a band a little darker in 

 color than the rest of the scale. The ventral scale is 

 delicate, white, and adheres to the bark, leaving a whit- 

 ish scar when the scale is removed. 



Scale of male. — The scale of the male is elongate-oval 

 (see Plate XXXI., Fig. 3, h), from 1 to 2 mm. in length, 

 and half as wide. It is considerably darker than the 

 scale of the female. The position of the larval scale is 

 marked by a nipple-like prominence situated between the 

 center and the anterior margin of the scale. This prom- 

 inence is usually covered with a slight excretion. When 

 rubbed it is orange-red. The ventral scale is white and 

 slightly thicker than that of the female. 



JEggs. — The eggs are pale yellow. 



Young. — The young larva when first hatched is pale 

 yellow, and in outline elongate-oval. Antennae distinct 

 and apparently five-jointed, the last joint as long or 



