AKT. 20 A NEW BORBORID FLY FEOM SOUTH AMERICA BEZZI 6 



Prelabriim exceedingly developed and prominent, shaped as a coni- 

 cal, erected organ, which is larger than the third antennal joint. 

 Mouth opening small and closed by a membrane around the base of 

 proboscis. Palpi not distinguishable. Proboscis very thick and 

 strong, cylindrical, minutely ribbed, and of about the same breadth 

 throughout its whole length, slightly curved and extending to the 

 middle coxae; more than the basal half is shaped as a sheath, from 

 which is exserted the terminal part, which is a little swollen and 

 provided with a middle longitudinal furrow ; the terminal flaps seem 

 to be very minute. Antennae with the basal joints hidden below 

 the anterior border of frons; third joint rounded; arista thin and 

 short, inserted near the base of upper border, not longer than the 

 breadth of frons, with short plumosity on the upper side, with only 

 2-3 hairs below. 



Figs. 1-2. — Pycnopota manni, 1 Wing; 2, head; prl=puei,abrum. 

 schematical and grbsatly e,nl.aeged 



All figores 



Cephalic chaetotaxy: 1 postocular, 1 vertical, 1 ocellar, 2 orbitals 

 directed inwardly, 1 decussate in front of the frontal stripe; 

 vibrissae rather weak; no genal bristle; peristomial border with a 

 simple row. 



Mesonotum convex on the back, a little more long than broad, 

 with rather prominent shoulders; transverse suture broadly inter- 

 rupted in the middle; pleural sutures distinct; scutellum small and 

 rounded; postscutellum greatly developed, of about the same size 

 as the scutellum itself; mesophragma convex and likewise greatly 

 developed, with a prominent rounded tubercle on each side. Halteres 

 normal; calypters rudimentary, with long soft cilia at border. 



Back of mesonotum bare and rather shining, destitute of longi- 

 Tudinal rows of setulae, with only one roAV of acrostichal on each 

 side, extended from the fore border to the scutellum; 3 rather strong 

 dorsocentral, one of which is before the suture; 1 humeral, 1 

 praesutiiral, 2 notopleural, 1 anterior supraalar, 1 posterior sup- 

 raalar; just above the shoulder several bristly hairs, one longer and 



