292 ENTOMOLOGICAL NEWS [xxxii, '21 Undescribed Crane-Flies from Argentina (Tipulidae, Diptera.) Part IV. I'.v CHARLES P. ALEXANDER, Urbana, Illinois. The species described in the present installment all belong to the tribe Eriopterini, which includes a vast complex of small forms within the Neotropical fauna. The material was collected in the Province of Catamarca by Senor Weiser and sent to me for determination by Dr. Bruch. My sincere thanks are extended to both of these gentlemen for their kind co-operation now and in the past. The types are preserved in the collection of the writer with the exception of that of Molophilus stylifcr which has been placed in the La Plata Museum together with paratypes of the other species described herewith. Molophilus catamarcensis sp. n. General coloration dark brown; antennae of male elongated; wings strongly infuscated; male hypopygium with the apparent pleural ap-pendage a straight chitinized bar that is produced into a beak-like spine on its inner face before the apex, the outer apical margin microscopically serrulate. $ . Length about 4-4.5 mm. ; wing 5-5.5 mm. Rostrum and palpi dark brown. Antennae of the male elongate, if bent backward extending to beyond the base of the abdomen ; antennal segments black, each with a ring of long black verticils. Head dark brown. Pronotal scutellum yellowish white. Mesonotum dark brown with a brown pollen, the humeral region of the praescutum yellowish white. Pleura dark brown. Halteres light yellow. Legs with the coxae and trochanters testaceous yellow ; femora obscure brownish yellow, pass-ing into dark brown ; tibiae brown, the tips and the tarsi brownish black. Wings with a strong brownish tinge, the dark brown veins clothed with conspicuous dark hairs. Abdomen dark brown. Male hypopygium with the apparent pleural appendage appearing as a straight, chitinized bar, before the apex on the inner face, jutting out into a beak-like spine, the outer margin before the tip microscopically serrulate. Holalypc : $ , Punta de Balasto, Catamarca, altitude 2,300 meters, November 22, 1920 (V. Weiser). Paratopotypc: $. Molophilus stylifer sp. n. General coloration brown ; lateral margins of praescutum obscure yel-low ; antennae of male very elongate; wings grayish subhyaline, semi-atrophied ; male hypopygium with each apparent pleural appendage ap-pearing as a black, stylet-like, straight and slender spine.