INSECTS INFESTING THE ELM. 



CHAP. 



The Elm and Locust Scale 157 



The Semicolon Butterfly (Grapfa interroga 

 tlonis), also infests the elm. 



CHAPTER CLVII. 



The Elm and Locust Scale (Cal.) 

 (Lrcanivm Spf) 



Order, Hemiptera ; 

 Sub-order, Homoptera ; 



Family, Coccid^. 



Fig. 230. 



[A dark brown scale insect infesting the elm and locust trees.] 

 Fig. 230. — Elm and Locust Scales — color, 

 brownish-black. 



This species is found on the elm trees, espe- 

 cially the cork elm, and also on the locust trees — 

 varieties, honey locust and Chinese locust ; they 

 infest the branches (Fig. 230) and leaves. 



The female scale is of a dark-brown color, 

 ovate in form, and measures three lines in 

 length, two and one quarter lines in width, and 

 nearly two lines in height. This 

 scale differs from the black scale 

 (Chapter LXXXIV) and filbert 

 scale, in the form being conical (Fig. 230). 



Fig. 231. — Larva of Elm and Locust Scale 

 enlarged — color, reddish-yellow. 



Larva (Fig. 231) — length, one ninetieth of 

 an inch ; form, elongate-ovoid. Eggs — color 

 yellowish-white, from two hundred to three 

 hundred being produced by each female. 



Remedies. — Same as for black scale, Chap- 

 ter LXXXIV. 



