March, 1919.] Weiss and Dickersox : Insects of Rose-Mallow. 63 



observed on more mature stems. The galls vary from one anil cne 

 half to four inches in length and sometimes there is scarcely a trace 

 of the swelling. Most of the larvae have been in the swollen part of 

 the gall, but sometimes a few have been found in the stem above the 

 swollen part. 



A number of galls have been examined, and while we have found 

 a number of larvae in some, we have never found as many as Dr. Felt 

 suggests may occur, although their number varies. On October 27, 

 1918, seventeen galls were collected and examined; eight contained 

 nothing while exit holes were noted on the outside of the galls. The 

 remaining nine contained larvae as follows: 2, 7, 3, 5, 10, 8, 4, 17. It 

 is evident that the insect hibernates in the gall and emerges in the 

 spring. This accounts for the April records. Our own specimens 

 both seasons emerged in August, but whether the insects occur in 

 broods we are unable to say. 



The description of the larva is given by Felt as follows : " Length 

 4 mm., rather stout, light yellowish. Head small, antennae uniarticu- 

 late, slender, tapering; breast bone stout, somewhat expanded api- 

 cally, bidentate and with a rudimentary median tooth; skin finely 

 shagreened; posterior extremity broadly rounded." It will not be 

 necessary to give the descriptions of the adults. 



It is sufficient to note that this cecidomyid is a rather pretty spe- 

 cies, being dark brown in color with lighter markings of golden 

 yellow and silvery white; posterior tarsi with second to fourth seg- 

 ments banded at both extremities and antennal segments of male are 

 15 to 16, while those of the female number 23. 



Our records of distribution are Staten Island, X. Y. (Felt) ; 

 Rutherford, Arlington, Atlantic Highlands and Palmyra, N. J. The 

 gall does not seem to be particularly injurious to the plant. 



Plant Lice. 



Plant lice were observed on the hibiscus plants, both in the nur- 

 sery at Rutherford and the marsh at Arlington early in July. A few 

 days later they were noted on plants in the marsh at Ridgefield and 

 at one or two other points later in the season. At Rutherford they 

 continued on the plants throughout the season and on October 24, 

 after the temperature had been low enough to effect many of the 



