CHRYSANTHEMUM MIDGE. % 
times. Hairs on tip in superabundance. Occurring on both leaf surfaces, stem and 
flower head. 
Larva [fig. 2, C, E].—Length | mm., yellowish or yellowish orange when full grown, 
moderately stout, the extremities rounded; segmentation distinct and the skin smooth. 
Pupa [fig. 2, F]—Length 1.25 mm., stout, narrowly oval, the cephalic horns dis- 
tinct, conical, the thorax yellowish orange, the wing pads fuscous in pupe nearly ready 
to transform, the leg cases dark yellowish brown, the abdomen a variable orange, 
narrowly rounded apically. 
Male.—Length 1.75 mm. Antenne nearly as long as the body, sparsely haired, 
fuscous yellowish; 17 or 18 segments, the fifth with a stem about three-fourths the 
length of the subcylindric basal enlargement, which latter has a length about twice its 
diameter and a rather thick subbasal whorl of long, stout setae; terminal segment 
variable, usually somewhat reduced, irregular, elongate, ovate. Palpi: The first 
segment subquadrate, the second narrowly oval. Mesonotum dark brown, the sub- 
median lines yellowish. Scutellum and postscutellum fuscous yellowish, the abdo- 
men mostly a pale yellowish orange. Wings hyaline, costa light straw, halteres 
yellowish transparent. Legs a pale straw, the pulvilli a little longer than the long, 
slender claws, the latter with a long, slender tooth basally. Genitalia; basal clasp 
segment moderately long, stout; terminal clasp segment short, stout, with a distinct 
spur; dorsal plate short deeply and roundly emarginate, the lobes short, broad, 
obliquely truncate apically; ventral plate short, deeply and roundly emarginate, the 
lobes rather long and tapering to a narrowly rounded apex. — 
Female.(fig. 2, H]|.—Length 1.75 mm. Antenne extending to the third abdominal 
segment, sparsely haired, fuscous yellowish; 16 or 17 segments, the fifth with a stem 
about one-third the length of the cylindric basal enlargement, which latter has a 
length a little over twice its diameter; terminal segment reduced, sometimes com- 
pound and tapering to a narrowly rounded apex. Palpi: The first segment subquad- 
rate, the second subconical and with a length a little greater than the first. Mesono- 
tum fuscous brown, the submedian lines, the posterior median area, the scutellum 
and postscutellum mostly fuscous yellowish, the apex of the scutellum narrowly 
fuscous. Abdomen reddish orange, apically fuscous yellowish, the ovipositor about 
one-half the length of the body; terminal lobes short, broad, broadly rounded and 
sparsely setose apically. Other characters practically as in the male. 
LIFE HISTORY AND HABITS. 
ADULT STAGE. 
The adult female shows a marked preference to lay eggs in the buds, 
or in the tissues just unfolding from the buds. Serious injury to the 
host results from this habit, and the commercial value of the plant is 
greatly reduced, if not entirely eliminated. 
Emergence of adult—On March 26, 1919, H. L. Sanford observed 
the emergence of a female at 1.09 a. m. On the following night 
observations by C. A. Weigel taken at intervals varying from 15 to 
20 minutes apart beginning at 12.30 a. m., and ending at 5.45 a. m., 
showed the emergences as follows: At 1 a.m., 1 female; at 4a. m., 1 
male; at 4.02 a. m., 4 females, 3 males. In addition the following 
observations were recorded: When the female emerges the body is 
pushed out of the gall for approximately three-fourths its length. 
The wings at this time appear as dark gray or black club-like append- 
ages. The antenne are moved about in a very active manner. The 
legs, which are at first folded parallel to the body, are thrust outward 
