REPORT OF THE STATE ENTOMOLOGIST I918 



151 



heavy, chitinous teeth. Dorsal plate deeply incised, the lobes 

 narrowly rounded; ventral plate broad, deeply and broadly emarginate, 

 the lobes broadly rounded; style very stout, short. Type Cecid. 167. 



Paradiplosis partheniicola Ckll. 



1908 Cockerell, T. D. A. Entomologist, 1900, 33:201 (Diplosis) 

 1918 N. Y. State Mus. Bui. 200, p. 202, 204 



This reddish midge was reared March 26, 1900 by Prof. T. D. A. 

 Cockerell from galls on Parthenium incanum collected at 

 the foot of Picacho mountain, Mesilla valley. New 

 Mexico. The type material, kindly placed at our 

 disposal by the describer, has enabled us to refer 

 the insect tentatively to the above-named genus 

 and also to supplement, in considerable measure, 

 the original description. 



Gall (fig. 26). Diameter 5 mm, woolly, snow- 

 white and appearing like little tufts of cotton 

 wool at the base of the leaves. 



Larva. It is described by Professor Cockerell 

 as orange. The exuviae are colorless, except the 

 dark sepia bro^vn anterior extremit^^. 



Male. Length 2.5 mm. Antennae probably 

 nearly as long as the body, sparsely haired, pale 

 yellowish ; fourteen segments, the fifth with stems 

 one and one-half and two times their diameters, 

 respectively, distal enlargement with a length 

 one-half greater than its diameter, sHghtly ex- 

 panded at the distal fourth. Mesonotum reddish 

 brown. Scutellum pale yellowish, postscutellum a 

 little darker. Abdomen dark yellowish brown. Wings hyaline, costa 

 pale straw, the third vein uniting with the margin well beyond the 

 apex, the fifth, subobsolete distally, joining the posterior margin 

 at the distal third, its branch at the basal third. Halteres pale 

 yellowish. Coxae yellowish; femora, tibiae and tarsi mostly a pale 

 straw. Genitalia; basal clasp segment short, stout; terminal clasp 

 segment short, greatly swollen near the middle; dorsal plate mode- 

 rately long, broad, deeply and triangularly emarginate, the divergent 

 lobes broadly rounded; ventral plate moderately long, broad, broadly 

 rounded; style short, tapering, acute. 



Female. Length 2.5 mm. Antennae extending to the second 

 abdominal segment, sparsely haired, very pale; fourteen segments, 

 the fifth having a stem one-fifth the length of the basal enlargement, 

 which latter has a length fully three times its diameter, is strongly 

 constricted near the middle and has moderately thick subbasal and 

 subapical whorls of setae; terminal segment reduced, subcylindric, 

 with a length of about two and one-fotirth times its diameter and 



Fig. 26 Paradi- 

 plosis partheniicola, 

 galls on Parthenium 

 twigs (author's illus- 

 tration) 



