THE CANADIAN ENTOMOLOGIST 165 



globular second scapal segment reddish brown basally; flagellar segments with 

 very long vefticils in the- male. Head with front and anterior part of vertex 

 reddish; remainder of vertex brown; genae and occiput obscure yellow. 



Thoracic praescutum testaceous brown, unmarked; posterior sclerites of 

 mesonotum obscure yellow. Pleura testaceous yellow. Halteres pale, the knobs 

 obscure yellow. Legs with coxae and trochanters obscure yellow ; remainder 

 of the legs pale brown. Wings subhyaline, unmarked ; veins pale brown. 

 Venation: Sc ^ ending far before origin of Rs, the distance from three-fourths 

 to equal to length of Rs ; Sc^ some' distance from tip of Sc^; Rs rather long, 

 nearly straight; cell 1^^ M .^ closed; basal deflection of Cu^ at or before the 

 fork of M. 



Abdomen light brown, the sternites and hypopygium a little paler. Male 

 hypopygium with the ninth tergite conspicuous, semi-cylindrical, the caudal 

 margin truncated or feebly concave, the lateraU margins and angles with 

 numerous short appressed spines ; outer angle of the pleurite produced caudad 

 into' a stout pale spine which gradually narrows to the acute blackened point, this 

 blackened tip covered with abundant tiny appressed hairs ; pleural appendage 

 shorter than this spine, its tip provided with several powerful bristles. Penis- 

 guard pale, very stout at base, tapering to the pale flattened tip ; penis-guard 

 exceeding all other elements of hypopygium. . , 



Habitat — Argentina. 



Holotype, (^, Arroyo Famailla, Tucuman, altitude 400 meters, October 

 .12, 1920 (V' Weiser). 



Allotopotype, $. 



Paratopotypes, 8 J^ ?. 

 , Type in the collection of the author. 



Paratropeza xystophanes, sp. n. 



Head and antennae black ; mesonotal praescutum yellow with three black 



stripes ; postnotum with the cephalic half obscure yellow ; pleura black with a 

 narrow yellowish longitudinal stripe; wings faintly brownish yellow, stigma 

 triangular, dark brown ; r near the end of Rs; abdominal tergites brownish 

 yellow with a narrow, median brown longitudinal line. 



Male. — Length 7mm.; wing 8.6 mm. 



Rostrum and palpi black. Antennae black. Head shiny black. 



Pronotal scutum obscure yellow, indistinctly blackened anteriorly, scu- 

 -telluni yellow. Mesonotal praescutum shiny yellow with three broad shiny black 

 stripes ; scutum yellow, the lobes marked with black ; scutellum light yellow ; 

 postnotum obscure yellow, the caudal half dark brown. Pleura black ; a narrow 

 yellowish longitudinal stripe extending above the coxae ; a small patch of whitish 

 appressed pubescence above the middle coxae and an extensive area on th.e 

 metapleura. Halteres dark brown, the knobs conspicuously yellow. Legs with 

 the for€ coxae and trochanters obscure chestnut, the remaining coxae and 

 trochanters more yellowish ; fore femora brownish black with about the basal 

 third more yellowish ; remaining femora more uniformly brownish tes- 

 taceous ; tibiae brown, the tips a little darker; tarsi dark brown. Wings with a 

 faint brownish yellow tinge; stigma triangular, dark brown, surrounding the 

 radial crossvein ; a very narrow and indistinct brown seam along th'e cord and 



