CHIONASPIS SALICIS. 181 



Aspidiotus minimus, Barenspmng (Cooley); Zeit. fiir 



ZooL, p. 168, 1849. 

 Chionaspis vaccinii, Bouche ; Stett. Ent. Zeit., xii, 



p. Ill, 1851. 

 Aspidiotus populi, Bouclie (Cooley); Stett. Ent. Zeit., 



xii, 110, 1851. 

 Chionaspis alni, Signoret; Ann. Soc. Ent. Fr., ser. 



4, vol. ix, p. 443, 1869 ; Essai, p. 125. 

 Chionaspis fraxini, Signoret; Ann. Soc. Ent. Fr., 



ser. 4, vol. ix, p. 448, 1869 ; Essai, p. 127. 

 ? Aspidiotus salicis-nigrce, Walsh (Comstock) ; Re- 

 port State Ent. of Illinois, p. 40, 1868. 

 Chionaspis fur/urns, Morgan; Ent. Mo. Mag., s. s., 



vol. iii, p. 16, 1892 ; nee Fitch. 

 Chionaspis sorbi, Douglas; Ent. Mo. Mag., s. s., 



vol. iv, p. 130, 1893. 



Puparium of adult female (PL XIX, figs. 2, 2 A) 

 white, sometimes faintly tinged with yellow, which gives 

 it a wax-like appearance. Usually widely pyriform, but 

 is often irregular, and sometimes almost circular, but 

 in all cases it is suddenly attenuated at the anterior 

 extremity. Larval exuviae colourless, or with the 

 deeper parts dark ochreous. Second exuviao elongate, 

 often project beyond the margin, and are ochreous 

 brown, with the posterior extremity dull yellow; 

 secretionary covering very thin. Sometimes there 

 is an admixture of the dermal tissues of the plant 

 (fig. 2 A), and in late autumn and winter the puparia 

 become so darkened by the accumulation of dirt and 

 Protococci that they harmonise with the colour and 

 texture of the plant ; this is especially noticeable on 

 young sapling ash. 



Long 1*50 2*25 mm. 



Adult female (PL XIX, fig. 4; PL XXI, fig. 11) 

 elongate ovate ; cephalic, thoracic, and abdominal 

 segments strongly defined, the former being distinctly 

 trilobate. Colour dull crimson, cephalic extremity 

 dull orange mottled with crimson, pygidium bright 



