38 NEW YORK STATE MUSEUM 



tapering posteriorly. Skin coarsely shagreened. Posterior extremity 

 roundly truncate and with two submedian pairs of rather obtuse 

 tubercles, the outer pair distinctly smaller. 



Male. Length 1.5 mm. Antennae a little longer than the body, 

 thickly haired, reddish brown, yellowish basally; fourteen segments, 

 the fifth with stems three and four and one-half times their diameters 

 respectively. Palpi; first segment short, stout, second with a length 

 fully three times its diameter, third a little shorter than the second, 

 fourth one-half longer than the third. Face yellowish. Mesono- 

 tum dull reddish, the submedian lines yellowish, sparsely haired. 

 Scutelltmi deep red, postscutellum whitish transparent. Abdomen 

 with the basal half deep salmon, the distal segments yellowish 

 transparent. Genitalia a variable yellowish and yellowish red. 

 Wings hyaline, with a violet iridescence. Halteres yellowish trans- 

 parent, the knob reddish. Coxae and femora basally, yellowish, 

 the remainder of the legs a variable light straw; claws long, slender, 

 evenly curved, the pulvilli shorter than the claws. Genitalia; basal 

 clasp segment long, moderately stout; terminal clasp segment short, 

 stout; dorsal plate short, deeply and triangularly emarginate, the 

 lobes truncate or very broadly emarginate and sparsety setose; 

 ventral plate long, broad, broadly and roundly emarginate, the 

 lobes short, narrowly rounded; style long, slender. 



Female. Length 2.5 mm. Antennae extending to the fifth 

 abdominal segment, sparsely haired, fuscous yellowish, yellowish 

 basally; fourteen segments, the fifth with a stem three-fourths the 

 length of the cylindric basal enlargement, which latter has a length 

 three times its diameter and slightly constricted near the basal third ; 

 terminal segment, basal enlargement with a length three times its 

 diameter, the appendage stout, fingerlike. Palpi; first segment 

 irregular, short, the second with a length nearly three times its 

 diameter, the third as long as the second and the fourth about one- 

 third longer than the third. Face yellowish. Mesonotimi reddish 

 brown, the submedian lines fuscous yellowish, sparsely haired. 

 Scutelltmi and postscutellimi mostly deep red. Abdomen pale 

 yellowish orange. Halteres pale yellowish, the knob reddish. Coxae 

 yellowish; femora and tibiae fuscous straw, the tarsi darker, the 

 pulvilli nearly as long as the moderately stout claws. Ovipositor 

 yellowish, stout, about one-half as long as the abdomen; terminal 

 lobes lanceolate and sparsely setose. Cecid. a2 2S2. 



Name, common and scientific. This wheat midge, like a number 

 of injurious insects, has been known by a variety of names. It has 

 been shown above that there are at least two wheat midges in Europe 

 and since it may be convenient to distinguish this species from the 

 one it has hitherto been supposed to be, it is suggested that this 

 insect be given the common name of the Moselle wheat midge, since 

 it was in this region that it first attracted notice as a pest. 



This species was originally described as Cecidomyia 

 mosellana in 1857. It was discussed later by Fitch under the 

 name Cecidomyia tritici in the belief that the insect he 



