PipuncuJus schreiteri, new speeies. 



Male: — Of modérate size (4 mm. ; wing 4.5 mm.) and grayish 

 blaek appearanee. 



Head : — Siibhemispherieal, a little longer than its height, the 

 frontal aspect nearly circular in outline; oeellar triangle shining 

 blaek, small, a little longer than its base (upper margin) ; eyes 

 broadly contiguons above; frontal triangle a little larger than oeellar 

 triangle, covered with silvery priünosity ; third antennal joint produced 

 downwards into a long point, yellow in color, likewise the base of the 

 arista is yellow, the remaining portion and the two basal antennal 

 joints black ; arista shorter than length of frontal triangle ; face long 

 and narrow with parallel sides, overlaid with silvery pruinoslty; month 

 parts light yellow. 



Thorax : — Dark, overlaid with a grayish pruinosity, without 

 bristles and very thin pilosity. 



Legs : — Yellow with indefinite dark áreas on the outer surf ace 

 cf the femora, the tarsi slightly darkened. 



Abdomen : ■ — Dark, grayish pruinose ; a pair of small bristles at 

 anterior córner of first segment. 



Wing : — Hyaline ; last section of fonrth vein withont spur. 



Haltere : — Brownish, the intermedíate portion of the stem pa^e 

 yellow. 



One male, taken while hovering among the leaves of low plants. 



Tijpe locality: — Raco, Tucnmán (13 Pebruary, ]927, R. C. 

 Shannon). 



Named for Señor Rodolfo Schreiter, a very enthusiastic natnra- 

 list and collector, of the University of Tucnmán. 



Pipuncuhis tucumanns, new speeies. 



Male: — Very similar to P. schreiteri. Is somewhat smaller 

 (3.5 mm. ; wing 4.0 mm.) ; antennae black, the outer margin of third 

 antennal joint tinged with yellow; legs yellow with broad bands of 

 black surrounding the femora, their bases and ápices yellowish; abdo- 

 ruen with less pruinosity and more shining in appearanee. 



One male. 



Type Locality: — Quebrada de Lules, Tucnmán (2 Februarv, 

 1927, R. C. Shannon). 



Pipuncu'us doelloi, new speeies, 



A distinctive speeies, easily separated by its large size (5 mm. ; 

 vúng 6 mm.), the third antennal joint without a ventral pointed 

 prolongation and the abdominal fasciae. It differs further in having 

 the arista a little shorter than the length of the frontal triangle and 

 a row of setae on the lateral margin of the first tergite. The abdomi- 

 nal fasciae are interrupted in the middle on the third to sixth seg- 

 ments. 



The female has a very long and narrow front which is still more 

 narrowed above as it approaclies the ocelli. The ovipositor is long 

 and stout and yellowish in color. 



