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. 



