Vol. xxvi] 



ENTOMOLOGICAL NEWS. 



171 



gins of the sclerite broadly white; in alcoholic specimens four stripes 

 show on the praescutum, the elongated median one being subdivided 

 by a narrow line ; scutum light yellowish brown with a large rounded 

 brown spot on each lobe ; scutellum and postnotum reddish brown. 

 Pleura pale brown and white, the brown being in the shape of a broad 

 band extending from the cervical sclerites to the postnotum ; sternites 

 brown. Halteres rather long, pale yellowish brown. 



Legs with the coxae and trochanters light yellow, remainder of the 

 legs light yellowish brown, the tarsi a little more infuscated. 



Gonomyia (Gonomyia') mathesoni n. sp. 



Fig. i. Wing. Fig. 2. Hypopygium, lateral aspect of the penis guard. 



Fig. 3. Hypopygium, ventral aspect. a penis guard ; b pleura ; c dorsal apical 



appendage ; d ventral apical appendage. 



Wings hyaline or nearly so, stigma barely indicated, veins pale yel- 

 lowish brown. Venation: (see text figure i) Sc long, extending to 

 about midlength of Rs\ Rs elongated, arcuated; R2 + 3 subangulated 

 at the proximal end of the stigma; basal deflection of R^ + 5 usually 

 angulated; cell ist M2 open by the atrophy of the outer deflection of 

 vein MS; basal deflection of Cui far before the fork of M, this dis- 

 tance being longer than the deflection. 



Abdominal tergites brown, narrowly and indistinctly margined on 

 the lateral and caudal edges with dull yellow; sternites dull yellow. 

 Male hypopygium (see text figure 3) with the ninth pleurite (b) 

 enlarged at the base, at the apex produced caudad into an elongate, 

 fleshy lobe, pale in color and provided with numerous hairs; the ven- 

 tral inner face of the pleurite is provided with two appendages, the 

 dorsal one (c) very long, slender, simple, twisted, pale and blackened 

 at the tip; the ventral appendage (d) is bifid, the outer arm over 

 twice as long as the short cephalic inner arm; in a position of rest 

 both of these appendages are decussate. Penis-guard (a) viewed 

 from the side (see text figure 2) elongate, bent slightly ventrad, the 

 tip enlarged and provided on the lower surface with four teeth, the 



