362 NEW YORK STATE MUSEUM 



leaves of cottonwood, Popuhis monilifera, in Washington park, Albany, 

 N. Y. The petioles of many of the fallen leaves from these trees last 

 year (1896) showed the peculiar galls of this insect with its nearly trans- 

 verse opening for the escape of the winged plant lice. During the autumn 

 of the present year the galls of this species were nearly as abundant as in 

 the preceding season. 



Ctiaitophorus species. A plant louse belonging to this genus, was 

 generally present in numbers on the under surface of the leaves of the 

 Norway maple, Acer platanoides, throughout this city, and was also 

 reported from a number of other locaUties within the state. Several 

 winged and a number of wingless viviparous females were found on a 

 leaf — the latter commonly surrounded by a numerous progeny — the 

 winged individuals being, probably, the primary parents of the colony. 

 The groups of young were usually clustered along the veins of the leaf, 

 specially of those at the base ; occasionally groups would be found almost 

 midway between two veins. A large amount of honeydew was excreted, 

 which, when dripping upon the flagging beneath, would indicate the 

 presence of the insects above. The honeydew was quite viscid, and 

 when falling upon leaves underneath frequently dried in hard clear beads 

 of considerable size. This severe drain upon the tree continued for 

 several weeks, till arrested by the multiplication of the natural enemies 

 of this aphid. One of the most active was the common ladybug, Adalia 

 bipioictata, \hQ Xdixwdit and. pupae of which were abundant on infested 

 trees. A larger species, Anatis ocellata, was associated with it. Syrphid 

 larvae and the young of lace-wing flies, also preyed on this species. 



Examples of this insect were submitted to the division of entomology 

 at Washington, but they could not be referred to any described species_ 

 Dr Howard had received it during the past season from many localities 

 in New England, where it had been reported so injurious as to occa- 

 sion the fall of many of the infested leaves. 



Callipterus ulmifolii Monell. This delicate species was unusually 

 abundant on the under surface of the foliage of American elms. The 

 honey-dew produced by these species covered the sidewalk beneath, and 

 the surface of the leaves upon which it fell. This severe attack continued 

 through July and during the greater part of August, when it was finally 

 arrested by heavy rains, together with the aid of numerous coccinellid 

 larvae. Numbers of these, actively engaged in their beneficial work, 

 could be seen upon the lower limbs. Of a number of the larvae picked 

 up near the base of a small tree, nearly all were identified as Adalia 

 bipunctata. 



