588 PROCEEDINGS OF THE ACADEMY OF [Oct., 



and goes to above the fore coxa ; lower pleural stripe broader, travers- 

 ing the coxse, the yellow band between these dark stripes very clear, 

 at the anterior end including most of the fore coxa. Halteres light 

 yellow. Legs, coxs as described above, trochanters dull yellow, 

 femora brown broadly tipped with dark brown, tibiae and tarsi dark 

 brown. Wings light gray, the costal margin conspicuously light 

 yellow; cells C, Sc and Rt pale, almost hj^aline; stigma pale brown, 

 oval; veins brown; venation (PL XXVII, fig. 25): Sc ending far 

 before the origin of Rs, the distance equal to two-thirds the length 

 of the sector. 



Abdominal tergites dark brown, the apical third of each sclerite 

 j^ellow, the lateral margin narrowly yellowish; hypopygium reddish; 

 sternites brown, the extreme apex of each sclerite yellowish. Hypo- 

 pygium (PI. XXVI, fig. 21) with the pleurites rather long, slender, 

 with a few rather long hairs on the outer face near the tip, bearing 

 two appendages; of these the more dorsal is stouter, paler and less 

 chitinized on its basal two-thirds, the apex a strong chitinized- tooth 

 with numerous pale hairs around its base; this appendage is con- 

 nected basally with the long, flattened basal appendage, which is a 

 little truncated at its apex, shaped as in the figure. The ventral 

 lobe of the pleura is produced into a short fleshy conical lobe pro- 

 vided with long hairs. The dorsal gonapophyses are short, curved, 

 strongly chitinized beyond the curve, pointed at the tip, with two 

 or three blunt teeth on the cephalic or under face of the hook. 



Holotype, cf, Sport Is., Sacandaga R., Fulton Co., N. Y., August 

 24, 1910 (Alexander). 

 Allotype, 9 , topotypic. 



Paratypes, 50 cf 9 , topotyijic, July 5 and July 27, 1909. 

 1. Gonomyia slossonae sp. n. 



Cell 1st Mi open by the atrophy of the outer deflection of .1/,; 

 cell Ml absent. 



Female, length, 6-7 mm.; wing, 6-6.8 mm. 



Rostrum brown at the tip, yellowish at the base; palpi dark 

 brown. Antennse brown. Head light yellow. 



Thoracic pronotum yellow with a brown spot on either side. 

 Pricscutum light yellow with dark brown stripes, the median one 

 darker in front, behind somewhat divided by a pale line; the lateral 

 stripe^ begin behind the pseudosutural fove^e and are entirely con- 

 fluent with the middle stripe; pseudosutural foveae chestnut, very 

 far proximad; scutum yellow, the lobes largely dark bro^ATi; scutel- 

 lum (lull yellow; postnotum brown, yellowish on the sides in front. 



