INJURIOUS AND BENEFICIAL INSECTS OF CALIFORNIA. 



159 



Tyroglyphus mains (Shimer) and Hyperaspis sp. The parasitic 

 hymenopterous enemies are Abler us clisiocampce (Ashm.), 91 Physcus 

 varicornis How. and Prospaltella sp. 92 



LINTNER'S SCALE 



Chionaspis Hntneri Comstock 



(Fig. 137) 



Description. — This species greatly resembles the willow scale. 

 Chionaspis salicis-nigrce Walsh and the pine-leaf scale C. pinifoUa 

 Fitch. The exuviae are very 

 small, yellow and situated 



wfcs* 





at one end. The female 

 scales are white and broadly 

 pyriform. The male scales 

 are slender, white, with yel- 

 low exuviae one fourth as 

 long as the scale, which is 

 plainly tricarinate. 



Distribution. — This 

 species has been taken in the 

 central part of the State 



Food Plants. — Alder, 

 arrow-wood, spice bus h, 

 white birch, dogwood, hazel- 

 nut, Juneberry and leather- 

 wood are attacked. 



Control. — The control 

 measures, if ever necessary, 

 are the same as for the pine- 

 leaf scale. 



THE COTTONWOOD 

 SCALE 



Chionaspis ortholobis Comstock 



(Fig. 138) 



Description.— The female 

 scales are white, pyriform 

 and generally resemble the 

 willow scale (C. salicis- 

 nigrce), but are slightly 

 smaller and narrower, the 

 length being about T V inch. The exuviae are dark yellow and located at 

 one end of the scales. The bodies of the females are dark purple and 

 the eggs are of the same color. The male scales are white, much smaller 

 than the females, elongated, widest at middle and smooth. The lack 

 of carinas in the male scales distinguishes the species from all others of 

 the genus. The exuviae of the male scales are bright yellow. 





«m£ 



Fig-. 137. — Lintner's scale Chionaspis Hntneri 

 (jimst.. on willow. Enlarged three times. (.Orig- 

 inal) 



"Yearbook, U. S. Dept. Agric. p. 254, 1894. 



02 Cir. No. 121, Bur. Ent. U. S. Dept. Agric. p. 9, 1914. 



