166 THE CANADIAN ENTOMOLOGIST 



the outer end of cell 1^/ M.^ ; veins dark brown. Venation : Generally similar to 

 P. jactans Alexander (Brazil) ; Rs more arcuated; r close to the fork of Rs; 

 basal deflection of Cu^ a short distance beyond the fork of M. 



Abdomen shiny brownish yellow, the tergites with a narrow black 

 median line ; sternites clearer yellow ; hypopygium darkened. 



Habitat. — Argentina. 



Holotxpc (^, Quebrada Famailla, Tucuman, altitude 1,600 meters, October 

 16, 1920 (V.'Weiser). 



Type in the collection of the LaPlata Museum. 



Teucholal)is omissa, sp. n. 



Mesonotum obscure yellowish brown with three brownish black stripes ; 

 pleura black with a broad yellowish testaceous longitudinal stripe ; wings faintly 

 brown; stigma darker brown, subcircular; cell 1st M.^ open by the atrophy of 

 the outer deflection of M ^. 



Female. — Length 5 mm.; wing 5.2 mm. 



Head broken. 



Pronotum yellow. Mesonotal praescutum obscure yellowish brown with 

 three interrupted shiny brownish black stripes, the median stripe indicated only 

 on the cephalic margin of the sclerite as a shiny area ; lateral stripes narrower 

 and less distinct ; scutum obscure brownish yellow, the lobes marked with black ; 

 scutellum and postnotum obscure brown, covered with a short white pubescence. 

 Pleura black with a broad yellowish testaceous longitudinal ventral stripe, passing 

 beneath the root of the halteres ; pleura with a short white pubescence. Halteres 

 brown, the knobs obscure yellowish brown. Legs with the fore coxae dark brown ; 

 middle and hind coxae pale brown, whitish pubescent ; trochanters obscure 

 yellow; femora obscure yellow, the tips darkened; tibiae brown, the tips darker 

 brown; tarsi dark brown. Wings comparatively narrow, with a faint brownish 

 tin^e ; stig^ma darker brown, subcircular veins dark t>rown. Venation : Sc 

 moderately long, Sc ^ ending at about two-fifths the length of Rs; Sc ^ lacking; 

 Rs long, gently arcuated ; r a short distance beyond the fork of Rs; petiole of 

 cell 2nd M ., about one-half of this cell; cell 1st M .^ open by the atrophy of the 

 outer deflection of M^ ; basal deflection of Cm, a short distance beyond the 

 fork of M. 



Abdomen dark brown, the basal sternites obscure yellow. Ovipositor 

 with the basal shield black; valves of the ovipositor yellowish horn-color, 

 strongly upcurved. 



Habitat. — Argentina. 



Holotypc, $, Arroyo Famailla, Tucuman, altitude 400 meters, T)ctober, 

 1920 (V. Weiser). 



Type in the collection of the La Plata Museum. 



Teucholabis omissa is readily told from all described species of the 

 genus, with the exception of T. omissinervis Alexander (Peru) by the open 

 cell \st M„ . 



