REPORT OF THE STATE ENTOMOLOGIST I917 



119 



labels and one, though belonging to another group, was labeled in 

 addition Cecidomyia pellcx. The general appearance of 

 these insects is so similar that they were doubtless considered as 

 belonging to one species and were presumably reared from the 

 familiar gall on ash, generally ascribed to Cecidomyia pellex. 



Gall. The gall from which this insect was reared, if our associa- 

 tion be correct, is a large, tumid, green, reddish or brownish midrib 

 swelling ranging in length from 5 to 15 cm. The larger galls contain 

 from 30 to even 50 or more larvae which are found irregularly scat- 

 tered along the length of the deep fold evidently caused by their 

 activities. 



Male. Length 1.25 mm. Antennae one-half longer than the 

 body, thickly haired, hght brown; 14 segments, the fifth with stems 

 one ^ and one-half and three times their diameters, respectively; 

 terminal segment, basal enlargement subglobose, the basal portion 

 of the stem with a length over twice its 

 diameter, the distal enlargement much 

 produced, fusiform. Palpi; the first 

 segment short, stout, expanded distally, 

 the second stout, subquadrate, with a 

 length about twice its diameter, the third 

 one-fourth longer, more slender than the 

 second, the fourth more than twice the 

 length of the third, more slender. Meso- 

 notum dark brown, the submedian lines 

 thickly haired. Scutellum pale yellow- 

 ish brown, postscutellum a little darker. 

 Abdomen dark brown, rather thickly 

 haired. Wings hyaline, costa pale straw ; 

 halteres pale yellowish. Legs a vari- 

 able yellowish brown, the femora dis- 

 tally and the tarsal oegments somewhat 

 darker; claws long, slender, strongly 

 curved, the pulvilli a little longer than 

 the claws. Genitalia; dorsal plate short, 

 stout, deeply and triangularly incised, the lobes broadly rounded. 



Female. Length 3 mm. Antennae extending to the third abdominal 

 segment, sparsely haired, light brown; 14 segments, the fifth with a 

 stem about one-fifth the length of the subcylindric basal enlargement, 

 which latter has a length about twice its diameter; terminal seg- 

 ment reduced, the enlargement with a length about twice its diameter, 

 apically a short, stout appendage. Palpi; the first segment short, 

 stout, slightly expanded at the distal fourth, the second stout, 

 rectangular, with a length about twice its diameter, the third a little 

 longer, more slender, the fourth one-half longer and more slender 

 than the third. Color, wing and leg characters about as in the oppo- 

 site sex. Ovipositor about as long as the abdomen, the terminal 

 lobes indistinct. Type Cecid. 1027. 



Fig- 39 Contarinia 

 canadensis, fifth anten- 

 nal segment of male (en- 

 larged, original) 



