June, 1914.] Alexander: Craneflies From Costa Rica. 119 



Tribe Eriopterini. 



Genus RHABDOMASTIX Skuse. 



Subgenus Rhabdomastix Skuse. 



Rhabdomastix (Rhabdomastix) septentrionalis, new species. 



Antennae of the male very long; color of the body dark brown; the 

 stigmal spot of the wings pale. 



Male, length, 6 mm. ; wing, 7 mm. ; antennae (only twelve segments remain- 

 ing) 15.5 mm. 



Male. — Antennae with the basal segment very large, light brown, flagellum 

 yellowish brown. Head brown with a light gray bloom. 



Mesonotum dark brown, the pseudosutural fovea not conspicuous ; scutum, 

 scutellum and postnotum light brown. Pleurae light brown with a sparse gray- 

 ish bloom. Halteres pale yellow. Legs, coxae, brown with a sparse gray bloom, 

 trochanters dull yellow, femora dull yellow, tibiae light brown, tarsi brown. 

 Wings light gray, stigma oval, gray, rather indistinct, veins dark brown. Vena- 

 tion (see fig. 3) : R 2 ■}- 3, long, rather longer than vein R 2 alone. 



Abdomen dark brown, the apical margins of the sclerites paler, brown ; 

 hypopygium yellowish. 



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

 P. P. Calvert). 



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



Related to R. (R.) illudcns Alexander (Bolivia)^ but much 

 smaller and dark brown in color, the thorax not clear gray with 

 prominent pseudosutural foveae. This is the most northerly repre- 

 sentative of the subgenus yet made known. 



Genus GNOPHOMYIA Osten Sacken. 



Gnophomyia subhyalina Alexander. 



One female from Alajuela, C. R., alt., 3,100 ft., on Sept. 15, '09, 

 by Dr. Calvert. 



Genus MOLGPHILUS Curtis. 



Molophilus Orion, new species. 



Antennae of the male moderately long; ventral appendage of the hypo- 

 pygium in the shape of a long, paddle-like arm densely clothed with a brush of 

 hairs on its inner face. 



Male, length, 3.8 mm.; wing 4.4 mm. 



Female, length, 4.4 mm. ; wing 5 mm. 



Male. — Rostrum and palpi brown ; antennae rather short, if bent back- 

 ward not extending beyond the wing-root ; the flagellar segments oval ; an- 

 tennae brown covered with a dense pale pubescence; head grayish brown. 



1 Ent. News, 1914, Vol. XXV, pp. 210, 211; pi. 9, fig. 6. 



