4 Journal New York Entomological Society, t^'oi- xxviii. 



sternites a little darker. Male hypopygium rather large, the pleurites slender, 

 on the ventral inner face produced proximad into a prominent lobe that is 

 covered with appressed hairs; ventral pleural appendage large. Ovipositor 

 with the valves nearly equal in length, or the tergal valves a little shorter than 

 the sternal valves, the tips acute; the tergal valves are blackened and with the 

 dorsal edges minutely serrate. 



Habitat.— Argentina (Patagonia) ; Tierra del Fuego. 



Holotype, J*, Valle Tunel, Santa Cruz (Dr. Witte). 



Allotopotype, 2- 



Paratopotype, $; paratype, $, Tierra del Fuego (Ohlin). 



Dicranomyia sanctcc-cruza is a large, vigorous species that re- 

 sembles D. chlorofica (Philippi), but is readily told by the hand- 

 somely spotted wings. 



The paratype is in the Reichsmuseum in Stockholm. 



Genus Rhipidia Meigen. 

 Rhipidia (Rhipidia) costaloides new species. 



Antennae black ; general coloration black, the anterior part of the praescu- 

 tum more reddish brown ; wings pale gray with a grayish brown pattern along 

 the veins. 



Female. — Length, 4.8 mm. ; wing, 5.3 mm. 



Rostrum and palpi dark brownish black. Antennae black throughout. 

 Head dark. 



Mesonotal prasscutum reddish brown, becoming darker posteriorly, the re- 

 mainder of the mesonotum likewise dark. Pleura dark, the sternum more yel- 

 lowish. Halteres pale brown, the knobs darker. Legs with the coxae dark 

 basally ; trochanters brown ; femora brown ; remainder of the legs broken. 

 Wings pale gray subhyaline with a moderately heavy grayish brown pattern as 

 follows : six costal blotches that are approximately as large as the interspaces 

 between them, the first at the arculus, the third at the origin of Rs, the fifth 

 subocellate, at the stigma, the sixth at the end of vein ^^2 + 3; broad paler gray 

 seams along the cord and outer end of cell ist Mj. Venation : Sc ending just 

 beyond midlength oi Rs ; r at the tip of R^; deflection of R4 + B about as long as 

 cell 1st M,; inner end of cell ist M.^ not conspicuously arcuated; basal deflec- 

 tion of Cmi some distance before the fork of M. 



Abdominal tergites reddish brown, the caudal margin of the segments 

 broadly dark brown ; sternites dull yellow, the segments conspicuously ringed 

 with blackish brown as an annulus on the caudal margin of the segments and 

 on the cephalic margin of the following segment ; genital segment dull yellow. 

 Ovipositor with the valves short but heavily chitinized ; tergal valves slender, 

 strongly upcurved at the acute tips ; sternal valves long, ending about on a 

 level with the tergal valves, straight, the tips acute. 



Habitat. — Panama. 



