220 



HYMENOPTERA . 



most of the time in the pupa state, while the fly lives nine days. 

 The first brood of worms appeared May 21, the second brood 

 June 25. Winchell describes the larva as being 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 146, 1, shows the eggs deposited along the 

 under side of the midribs of the leaf; 2, the holes bored by the 

 very young larvae, and 3, those eaten by the larger worms. 



In transporting gooseberry and currant bushes, Walsh recom- 

 mends that the roots be carefully cleansed of dirt, so that the 



cocoons may not be car- 

 ried about from one gar- 

 den to another. The leaves 

 of the bushes should be 

 examined during the last 

 week of May, and as only 

 a few leaves are affected 

 at first, these can be de- 

 tected by the presence of 

 the eggs and the little 

 round holes in them, and 

 should be plucked off and 

 burnt. The female saw- 

 fly is bright honey-yellow, 

 with the head black, but 

 yellow below the insertion of the antennae. The male differs 

 in its black thorax, and the antennae are paler reddish than in 

 the female.* 



The genus Empliytus has nine-jointed antennae ; the third 



* Mr. Norton has communicated the following description of the larva of another 

 saw-fly of this genus which infests the weeping-willow. 



" Nematus trilineatus Norton. The larvae of this were first seen upon the weep- 

 ing-willows about August 1st, in immense numbers, almost wholly stripping large 

 trees of their leaves. They begin upon the edge of the leaf and eat all of it except 

 the inner midrib. They are very sensitive to disturbances, very lively, and are 

 generally found with the hinder part of their bodies bent up over the back. They 

 are twenty-footed, of a bright green color, palest at head and tail, with five rows of 

 black dots down the back, the outer row upon each side irregular and with inter- 

 vals. On each side above the feet is another row of larger black dots, and the three 

 anterior pair of feet are black at the base, middle and tip. 



" A great number of the saw-flies were found flying about the trees, August 19th, 

 in the proportion of about ten males to one female. The males being almost 

 wholly black upon the thorax." 



1*6- 



