1917 ENTOMOLOGICAL SOCIETY. 119 



the favorite places chosen for oviposition being the leaf hairs near the crevices 

 between the young forming leaves. Kepeatedly the female would come back to 

 apparently the same spot. With the exception of an absence of seven minutes, the 

 female was observed to be actively engaged in such conduct for a period of twenty- 

 seven minutes; On another occasion eggs were found near the tip of another 

 plant, and were laid, as Felt has already recorded, along the surface of the leaf 

 among the leaf hairs. On one occasion (October 27, 1916), in the Ottawa green- 

 house a string of extruded eggs was found attached to a dead female which had not 

 been able to free itself from the gall, and other eggs laid among the leaf hairs were 

 present on the gall. Altogether 41: eggs were counted. The length of the egg 

 stage is estimated by Felt to be probably twenty-four hours or less. 



The Larva. 



The mature larva is very similar to that of other cecidomyids; in color it is 

 yellowish, or yollowish-orange, in shape plump, rounded at either end, the segment* 

 being distinct; in length about 1 mm. 



The Pupa. 



The pupa is about 1.75 mm. in length. The abdomen is whitish or pale- 

 yellowish; thorax and wing covers pale yellowish-brown, cephalic horns distinct,, 

 eyes showing black,; leg-cases whitish or pale yellowish. 



The Adult. 



(Fig. 2, page 117.) 



The midge is a small two-winged fly, the length of the body being about 

 1.75 mm. The wings are transparent, the margins being light yellowish. The 

 body is mostly of an orange color, the legs yellowish. 



The Gall' 



The gall is a conspicuous oval-shaped swelling, in length from about 3 mm. to- 

 2.5 mm. It is often slightly paler than the color of the leaf or stem upon wliich 

 it occurs, but on some plants particularly on the stems it is concolorous and incon- 

 spicuous. When the flies have emerged the galls are readily seen, particularly on 

 the older leaves, owing to their having turned yellowish or whitish in color. 



Habits. 



Food Plants. In the Ottawa greenhouse all varieties of chrysanthemums 

 were seemingly attacked, A large number of different varieties were being grown 

 and the kinds which were noted to liave been most freely attacked are the following: 

 Chrysolora, Naomah, Eadoelii. Ramapo, Hortus Tolsoms, Mrs. Clay Frick, Dc 

 cember Gem, Madam G. Eivol, Dr. Enguehardt, Anna, Pacific Supreme, Early 

 Snow, Elberon, Ursula Griswold, Aesthetic and Etherington. The varieties Bob 

 Pulling, Gertrude Peers, Daily Mail, Oconta, Mrs. G. C. Kelly, W. Wood Mason, 

 F. T. Quilleton, and E. T. Quittington were fairly free from injury. All of the 

 above varieties are, of course, the blended product of Chrysanthemum indicum and 

 C. morifolium., both of which grow wild in China and Japan. 



In the Victoria greenhouse these varieties were infested : Smith's Advance,. 

 Halliday, Ivory, Polepheum, Chrysolora, Bonnafon, Wm. Turner, Western King,. 



