208 ENTOMOLOGY. 



grown in about a month after the egg is laid; it remains in 

 the pupa state about two weeks, and the beetle probably 

 lives several days before ovipositing, so that one generation 

 is in existence about two months, and there are two or three 

 generations in a summer. The beetle must hibernate, as it 

 appears very early in the spring. 



REMEDIES. Sifting the leaves with powdered oyster-shell lirne or 

 gypsum, hellebore or pyrethrum, is worth trying as a remedy, while 

 covering the young vines with cotton or a high frame covered with 

 fine muslin is the usual preventive. 



Th.3 Squash -bug (Anasa tristis De Geer). Numbers of 

 this great black bug are to be seen clustering 

 about squash-vines, sucking the sap with 

 their stout beaks. It is a large blackish- 

 brown bug, dirty yellowish beneath. To- 

 wards the last of June the female lays her 

 eggs on the leaves, and the young may soon 

 be seen sucking the sap in the leaves. Suc- 

 FIG. 253.Squash- cessive broods appear during the summer. It 



bug. Natural *f . 



size. can be controlled by hand-picking. 



Another species sometimes injurious to squash-vines is 

 the squash "lady-bird" (Epilachna borealis Thunberg), 

 whose larva is a yellowish grub with long branched spines, 

 arranged in rows of six on each segment, except the first 

 thoracic, which has only four. The beetle is like a large 

 Coccinella, and is yellowish, with seven large black spots 

 on each wing-cover. The pickle-worm (Phacellura niti- 

 dalis Cramer) bores cylindrical holes in cucumbers and 

 melons as well as squashes. It is a pale greenish-yellow 

 caterpillar, with a pale reddish head. It spins a slight 

 white cocoon, from which the moth issues eight or ten days 

 afterwards. 



Injuring the Hop-vine. 



The Hop Aphis. This plant-louse is a great pest of the 

 hop, as it clusters in immense numbers on the branches 

 and leaves, and is very difficult to extirpate. Prof. Riley 



