June, iqmI Alexander: Craxeflies From Costa Rica. 122 



Gonomyia rccurvata differs from its nearest described relatives, 

 amacona Alexander and plcnralis Williston in the male hypopygium, 

 the two chitinized appendages to the plcurites, the extremely elongate 

 and straight dorsal gonapophyscs and the remarkable recurved ventral 

 gonapophyse. 



Gonomyia (Leiponeura) calverti, new species. 



Puclla group ; basal antennal segments tinged with brown ; male hypo- 

 pygium without a recurved ventral hooU ; ventral portion of the hypopygium 

 with two rounded, flattened lobes each of which bear 8 or 9 chitinized teeth. 



Male, length, 3.4 mm. 



Male. — Rostrum and palpi brown; the enlarged basal segments of the 

 .-mtcnnx brown, not orange, flagellum light brown. 



Mesonotal pra;scutum very light grayish brown without distinct markings; 

 the pronotum, a narrow lateral margin to the prsscutum and the median line 

 of the scutelluni yellowish ; scutum and postnotum light brown ; scutellum yel- 

 low, more brown at the base. Plcur.-e without distinct stripes. Halteres light 

 brown, the knob yellow. Legs, light yellowish brown, the individual segments 

 scarcely darkened at tip. Wings subhyaline with iridescent reflexions, veins 

 brown, stigma lacking. 



Abdomen light brownish yellow, the tergites rather darker than the stern- 

 itcs. Hypopygium having the pleural pieces (fig. 7) long, slender, slightly 

 curved, clothed with sparse long hairs ; the tip is suddenly narrowed, more 

 chitinized and ending in two long curved bristles. Ventrad of the pleurites 

 is an enlarged cylindrical tube which is produced dorsally into a long obtuse 

 point, and ventrally into two hand-like flattened organs armed with 8 or 9 

 chitinized teeth as shown in fig. 8, d; these flattened organs are directed 

 ventrad and entad. From inside this genital chamber, near the dorsal wall 

 project two subchitinized elongate flattened appendages (c). 



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

 P. P. Calvert). 



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



This species is similar to pitella Williston in its pletiral and wing 

 patterns but the basal segments of the antennae are suffused with 

 brown and the hypopygium is very different from that shown in 

 Williston's figure^ which shows a prominent recurved ventral hook. 



Tribe Limnopiiilini. 

 Genus LIMNOPHILA Macquart. 

 Limnophila guttulatissima Alexander. 



One female from Cartago, C. R., along a ditch on l'"tb. 26, 1910. 

 1 Trans. Ent. Soc. Lond., 1896, pp. 28S, 289, pi. 10, fig. 60 a. 



