CHRYSANTHEMUM MIDGE. 7 



times. Hairs on tip in superabundance. Occurring on both leaf surfaces, stem and 

 flower head. 



Larva [fig. 2, C, E]. — Length 1 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 pupae nearly ready 

 to transform, the leg cases dark yellowish brown, the abdomen a variable orange, 

 narrowly rounded apically. 



Male. — Length 1.75 mm. Antennse 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. Antennae 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 subcorneal 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 4 a. 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 antennse are moved about in a very active manner. The 

 legs, which are at first folded parallel to the body, are thrust outward 



