10 



doiibtecUj' prove to be identical Avitli the latter. I have not seen au- 

 thentic specimens of Norton s species, but there are no characters^ 

 indicated by Mr. Xorton in his description, sufficient to separate 

 the two species. Norton's specimens were collected in Xew England, 

 bnt if they prove to be the same as the Eiu^opean species it wonld indi- 

 cate that the species was imi3orted very mnch earlier than Mr. Jack 

 supposed. The Eiu^opean species is widely distributed, occurring 

 throughout southern and central Europe and also in eastern Siberia, 

 and is a well known rose pest, exactly agreeing in habit with the spe- 

 cies described by Mr. Jack. Like the larvae of CJadius lyect'inicorms the 

 larva of this imported insect eats the entire substance of the leaf, but 

 differs from the former in that it eats along the edges of the leaf with 

 the body more or less beneath the leaf, and when at rest remains cui^led 

 up on the under side of the leaf in a spiral or ball. The larva of the 

 latter is easily distinguished also by being smooth and by having a 

 yellowish-brown head with a broad brownish-black mark above. The 

 body is dark green above, with the sides and legs grayish-white. There 

 are several yearly broods, the larv?e appearing from May to October. 

 The eggs are placed singly, but scattered to the number of three to 

 seven, on the under sides of the leaves and the full-grown larva btu*- 

 rows, as stated, in the rotten wood or the pith of plants — very fre- 

 Cjuently of rose stems — to pupate or^ in the case of the fall brood, to 

 hibernate. 



Sr3r\IAKY OF THE HABITS OF THE THREE SAW-FLIES AFFECTING- 

 EOSES I^' THE rXITED STATES. 



The following brief summary of the habits of the three species of saw- 

 flies mentioned in the foregoing pages as affecting cultivated roses in 

 this country will serve to enable anyone to distiaguish the species and 

 determine the depredator in any particular case. 



The A3IERICAN Eose SLro- [jlonostegia rosce).— This, is the old and 

 well known species, and the only one which, up to within the last few 

 years, has been recorded as affecting the Eose in this country. It was 

 originally found in the Eastern States, but has now become widely dis- 

 tributed by being transported fr^om i3lace to place in connection with 

 rose plants. It is siQgie brooded, the flies emerging in May, or about 

 the time the Eose is in fall leaf. The eggs are circular and are inserted 

 singly in the edge of the leaf, on the under surface. The larva is about 

 one-third of an inch long, and slug-like, the thorax being swollen; but 

 it is not slimy, as is the case with many other allied saw-fly larv?e. It 

 feeds only at night, and always on the upper side of the leaf, skeleton- 

 izing it rather than eating the entii^e substance. Dming the day it 

 remains at rest, concealed on the under surface of the leaf. 



The larval period lasts from foiu^teen to iifteen days, when the larva 

 abandons the damaged plant and enters the soil, where it consti'ucts a 

 fragile earthen cocoon. In this it remams dormant until the foUowiag 



