94 



The following account of its habits is quoted from tlie Guide to 

 the Study of Insects : — "There are fifty species of Nematus in this 

 country, of which the most injurious one, the gooseberry sawfly, has 



been brought from Europe. 

 This is the N. ventricosus of 

 Klug, which was undoubt- 

 edlj^ imported into this 

 country about tlie year 1860, 

 spreading mostly from Koch- 

 ester, N. Y., where there 

 are extensive nurseries. 

 Prof. Winchell, who has 

 studied this insect in Ana 

 Arbor, Mich., where it has 

 been very destructive, ob- 

 served the female on the 

 16th of June, while depos- 

 iting her cylindrical, whitish 

 and transjjarent eggs, in 

 regular rows along the un- 

 der side of the veins of the leaves, at the rate of about one in forty- 

 five seconds. The embryo escapes from the egg in lour days. It 



Fig. 2. 



feeds, moults and bur- 

 rows into the ground 

 within a period of eight 

 days. It remains thir- 

 teen days in the 

 ground, being most of 

 the time in the pupa 

 state, while the fly lives 

 nine days. The first 

 bi'ood of worms ap- 

 peared May 21st; the 

 second brood June 

 25th. Winchell des- 

 cribes the larva as be- 

 ing pale-green, with 

 the head, tail and feet 

 black, with numerous 

 black spots regularly 

 arranged around the 



body, from which arise two or more hairs. Figure 1 

 eggs deposited along the under side of the midribs of the leaf; 2, the 

 holes bored by the very young larvse ; and 3, those eaten by the larger 

 worms. 



1, shows the 



