121 Journal New York Entomological Society. [Vol, xxii. 



Genus GONOMYIA Meigen. 

 Subgenus Leiponeuia Skuse. 



Gonomyia (Leiponeura) recurvata, new species. 



Pletiralis group ; male hypopygium having two chitinized points on the 

 pleurites ; dorsal gonapophyses long, slender, almost straight ; ventral gona- 

 pophyses bent cephalad. 



Male, length, 4.4 mm. ; wing, 3.7 mm. 



Female, length, 5.7 mm. ; wing, 5 mm. 



Male. — Rostrum and palpi brown ; antennae with the basal segments yellow 

 with a faint brown suffusion, flagellum brown; head pale yellowish. 



Mesonotal praescutum light brownish orange, the lateral margin very pale 

 yellow separated from the orange by a very narrow dark brown line which 

 is not apparent in front ; scutellum pale, whitish, with a brown median line. 

 Pleurffi having the pale line that is enclosed by the pleural stripes very pale, 

 almost white, the lower dark pleural stripe broad. Halteres light brown. Legs, 

 coxae and trochanters very pale, femora light brown with a broad, indistinct 

 subapical ring, the tip rather broadly pale ; tibiae and tarsi light brown. Wings 

 subhyaline, the stigmal spot vary large, rounded-oval, dark brown, veins brown. 



Abdominal tergites light yellow, the extreme tip and base of each seg- 

 ment conspicuously dark brown ; sternites more uniformly dark brown. Hypo- 

 pygium with the pleural pieces rather stout, the dorsal fleshy appendage long, 

 slender, very pale ; the ventral appendage is enlarged at its base and near the 

 tip bearing a prominent chitinized tooth which is directed outward ; at the tip 

 of the lobe are several bristles and before the chitinized portion there is a 

 shorter conical tooth on the outer or caudal margin of the lobe, this tooth 

 being very pale, subhyaline. The ventro-lateral margin of the pleurite is pro- 

 duced caudad into a long, slender chitinized rod which is directed toward the 

 chitinized tooth described above. The dorsal gonapophyses (see Fig. 6, e) : 

 are very long, slender, straight, lying parallel to one another and diverging 

 only at the tips which are more chitinized. The guard of the penis (g) is very 

 long, slender, extending about to the point of divergence of the dorsal gona- 

 pophyses. The ventral gonapophyse (/) is rectangular with two short teeth at 

 the tip. The whole organ is recuned cephalad and the tips lie against the 

 flaring margin of the gth sternite. 



Female, similar to the male but larger, the yellow color of the abdominal 

 tergites not so apparent. 



Holotype, male, .^lajuela, C. R. ; alt. 3,100 ft.; Sept. 15, '09 (Dr. 

 P. P. Calvert). 



Allotype, female, near Cartage, C. R. ; alt. 5,000 ft.; Dec. 15, '09; 

 south slope of Irazu, over mud (Dr. P. P. Calvert). 



Paratypes, male, with the holotype in the author's collection. 

 Female, Laguna near Cartago; Feb. 26, '10. 



Type in the collection Acad. Nat. Sci. Phil. 



