20 THE KEPOET OF THE No. 36 



Oomplaints from amateur rose-growers, early in the season, led to an ex- 

 amination of several dead stalks from rose bushes. In almost every case a row 

 of larvae was found occupying the pith. These were arranged with surprising 

 regularity, each one occupying nearly the same space and separated from the next 

 by only a thin partition. The moths iiiat emerged from the affected twigs proved 

 to be CeratopJiorus tenax, Fox. Concerning this species S. A. Rohwer writes: 

 ^'As a rule it cannot be classed as an injurious insect, as it attacks twigs which 

 have been pruned, in preference to making its own holes, and pruned twigs can be 

 treated by painting the end with almost any kind of paint, or putting a small 

 tack down the pith." 



Leaves on Populus grandidentata, Michx., slightly rolled from one edge towards 

 ihe midrib and almost parallel to it were found to contain larvae of a sawfly. 

 These pupated in the soil of the breeding jar and emerged about the middle of 

 July. The species were found to be Pontania populi, Marlatt. The identification 

 of this and the preceding species I owe to the kindness of S. A. Eohwer, Wash- 

 ington. 



This season has been a suitable one for the production of aphids. On the 

 American Elm numerous clusters of leaves rolled and massed together indicate 

 the activity of Schizoneura ainericana, Eiley, while along frost cracks and other 

 breaks in the superficial tissues frequent lines and masses of white pubescence 

 show that Schizoneura rileyi, Thomas, has there found favourable places for the 

 establishment of colonies. The many specimens of Scotch Elm, Ulmus glabra, 

 Huds., furnish a host for a distinct form of aphid. The individual leaves are 

 rolled from one side in this case, and the part included in the roll is distinctly 

 lighter in colour. For several years a large number of leaves have fallen in July 

 and August from our Norway Maples, Acer platanoides, L. This has been 

 particularly well marked this season. When the leaves are examined small colonies 

 of plant lice are found along the line of the midrib and the principal veins. The 

 larvae are light green in color, but the adults, while still retaining the green as 

 a ground color, are distinguished by a comparatively wide, red, median band on 

 the thorax and a V-shaped one on the abdomen, the open part of the V pointing 

 forward. The "honey-dew'^ from the aphids gives the leaves a varnished appear- 

 ance and often is so plentiful as to drip from them to the sidewalk. Populus 

 grandidentata, Michx., is attacked in a similar way by a closely related species of 

 aphid, but in this case the leaves do not become detached from the tree. 



The larvae of the following moths were common this season on the hosts 

 indicated : — 



Archips fractivittana, Clemens. — Host, Crataegus. — Tlie larva draws several 

 leaves of the host together with silk threads and feeds within the shelter thus 

 formed. 



Acleris fractivittana, Clemens. — Host, a cultivated Double- white Lilac. — The 

 leaves are drawn together by the larva as in the preceding species. 



Pyrausta sp., near to or thestealis, Walker. — Host, Corylus rostrata, Ait. — 

 The larva rolls up single leaves along a line almost parallel to the midrib. 



Anacampsis populella, Clemens. — Host, Populus grandidentata, Michx. — 

 Single leaves of the host are rolled up as in the preceding species. 



Acleris heindelana, Fernald. — An inquiline in the gall formed by Rhahdo- 

 pJiaga rhodoides, Walsh, on SaKx humilis, Marsh. This moth avails itself of 

 leaves already massed by the stimulus of the gall producer, and thus escapes the 



