ART. 20 A NEW BORBORID FLY FROM SOUTH AMERICA BEZZI O 



PYCNOPOTA MANNI, new species 



A small, reddish-brown fly with yellowish legs and whitish abdo- 

 men, of which the sclerites are sometimes blackish. 



Length of body: (male) 2.5 mm., (female) 4 mm.; of wing 2.8-3 

 mm. 



Head blackish, opaque, with reddish frontal stripe and reddish 

 or yellowish peristomalia. Antennae pale yellowish. Prelabrum 

 shining reddish ; sheath of proboscis shining black, finely wrinkled : 

 terminal portion of proboscis shining reddish; buccal membrane 

 white. All the cephalic bristles and hairs black. 



Mesonotum shining reddish-brown or black, blackish along the 

 middle stripe and on a rounded spot on each side of the transverse 

 suture; pleurae more pale and less shining, but the mesopleura 

 more or less darkened. Scutellum shining reddish, more or less 

 darkened red; postscutellum and mesophragma opaque, reddish. 

 All the bristles and hairs black. Halteres dirty whitish, their 

 rounded knob snow-white. 



Abdomen dirty whitish; but the sclerites, when developed, are 

 opaque blackish or even black; in the male type only the tergites 

 of the first two segments are well chitinized; in the female type 

 all the tergites and the much smaller sternites of all the five seg- 

 ments are well developed; one additional female specimen has the 

 tergites on first, second, and fifth segments chitinized and the stern- 

 ites only on fifth segment; in another female there is distinct only 

 the tergite of the first segment. The bristly hairs are black, the 

 smaller hairs are dark reddish; the setulae on sides of middle seg- 

 ments (type female) are placed on small blackish dots, very dis- 

 tinct on the whitish membrane when the abdomen is distended. 

 Hypopygium dirty whitish, blackened below. Basal segment of the 

 ovipositor (sixth abdominal segment) dirty whitish, but always 

 with well developed, black tergites and sternites, in one case only 

 the tergites being not distinct. Terminal lamellae dirty brownish; 

 terminal spine quite black. 



Coxae and legs entirely reddish-yellow to the end of tarsi; hairs 

 dark reddish, front femora with a complete row on outer side, the 

 posterior ones with only 2-3 apically; front tibiae with but one 

 long hair toward the middle; hind tibiae with a row of 5-6 

 scattered long hairs at hind side. Claws blackish, pulvilli dirty 

 whitish, in the male only a little more developed than in the female. 



Wings slightly grayish, iridescent, with dark yellowish veins, the 

 costa being more dark, chiefly along the but little thickened second 

 segment. 



Described from one male and three females collected on the Mul- 

 ford Biological Exploration at Huachi Beni, Bolivia, September, 



