xxxiii, '221 ENTOMOLOGICAL NEWS 209 



Allot\pc, 9 , Caspinchango, Catamarca, altitude 2500 meters, 

 March 28, 1921 (V. Weiser). Paralyse, 9, with the allotype, 

 March 2, 1921. 



The female is entirely similar to the male. The femora are 

 yellow with a conspicuous, dark brown, suhterminal ring. 



Rhabdomastix (Sacandaga) complicata sp. n. 



General coloration dark brownish gray ; wings tinged with hrown. 

 the extreme base paler in both sexes ; m short or obliterated ; male 

 hypopygium with the outer pleural appendage bifid at apex, the lower 

 arm bearing two long, chitinized teeth. 



$ . Length about 3.6 mm ; wing about 3.2 mm. 9 . Length 3.5-4 

 mm. ; wing 3.6-4.2 mm. 



Rostrum and palpi brownish black. Antennae with the scapal seg- 

 ments brownish black; flagellum slightly paler brown; flagellar seg- 

 ments subglobular. Head dark brownish gray with a sparse bloom. 



Mesonotum dark brownish gray, the usual three praescutal stripes a 

 little darker hrown but very poorly defined. Pleura brownish gray. 

 Halteres light yellow. Legs black, the femoral bases in some cases a 

 little paler, in other cases the femora nearly uniform throughout. 



Wings with a brownish tinge, the extreme base paler, this including 

 the cells proximad of arculus ; veins brown. Venation : 5Y1 ending 

 about opposite two-fifths the length of Rs, Sc2 near midlcngth of the 

 distance between the origin of Rs and the tip of Scl ; r a short distance 

 beyond the fork of M; cell 1st M2 closed; m short to lacking, cell 

 2nd M2 in some cases being short-petiolate ; basal deflection of Cul 

 a short distance beyond the fork of M. 



Abdomen dark brownish black. Male hypopygium generally similar 

 to that in R. basnHs, but the outer pleural appendage much more com- 

 plex, appearing as a narrow arm that is expanded apically and here 

 deeply bifid, the lower branch being chitinized and deeply notched 

 apically, the outer edge of this notch produced into two long, blackened 

 teeth, the margins of the notch feebly denticulate ; inner pleural ap- 

 pendage much longer and stouter than in basalts, only a little shorter 

 than the outer pleural appendage. The digitiform lobe on the inner 

 face of each pleurite is stouter than in basalts. Ovipositor with the 

 valves horn-colored. 



Habitat: Argentina. Holotypc, $, Masao, Catamarca, alti- 

 tude 2500 meters, February 10, 1921 (V. Weiser). Allotype, 

 9 , Caspinchango, Catamarca, altitude 2500 meters, February 

 23, 1921 (V. Weiser). l\iratopt\pcs, 5 9 's. 



Rhabdomastix complicata is allied to R. basalts Alex. (Ar- 

 gentina), but is readily told by' the darker coloration, the al- 

 most uniform wings in both sexes and the complex male hypo- 

 pygium. 



