142 Journal New York Entomological Society. [Vol. xxvu. 



Abdominal tergites pale brown, the sternites still paler ; female ovipositor 

 with the elongate acicular valves of this group of species. 



Habitat: Panama (Darien). 



Holotype, <$, Between the Rio Capeti and the Rio Yape, Depart- 

 ment of Panama, June 27, 1918 (Axel Olsson). 



Allotopotype, 2- 



In its uniformly white tarsi this species is allied to T. leucoxena 

 (Alex.) of Mexico, a large species that is much darker colored, the 

 stigma dark brown, the legs dark brown with the white femoral and 

 tibial tips much wider, etc. It is probable that all of the known mem- 

 bers of the bromeliadicola group of the genus breed in the water and 

 detritus that accumulates in the leaf axils of bromeliaceous plants. 

 The species of this group of the subgenus may be separated as 

 follows: 



1. All the tarsi white 2 



Not as above ; at least the fore and middle tarsi dark or else the meta- 

 tarsi ringed basally with black 3 



2. Larger ; abdominal tergites laterally yellowish ; stigma dark brown 



(Mexico) leucoxena (Alex.). 



Small and uniformly pale brown in color; stigma pale (Panama), 



sororcula n. sp. 



3. All the tarsi dark brown 4 



Not as above ; at least the hind tarsi with white 5 



4. Tibiae with the extreme tips white (Costa Rica) ... .bromeliadicola (Alex.). 

 Tibiae dark brown beyond the base (British Guiana) .. .geniculuta (Alex.). 



5. Hind tarsi white; middle tarsi brown (British Guiana) ... .pallipes (Alex.). 

 All the tarsi white, the metatarsi with the basal quarter black (Panama), 



metatarsata (Alex.). 

 Genus Gnophomyia Osten Sacken. 



Gnophomyia laticincta new species. 



Coloration reddish-brown ; femora pale brown, broadly tipped with darker ; 

 wings subhyaline with a broad indistinct band along the cord. 



Male. — Length, 7.8 mm. ; wing, 7.5 mm. 



Rostrum and palpi short, dark brown. Antennae moderately elongated, 

 reddish-brown, the flagellar segments elongate-cylindrical, covered with a pale 

 pubescence. Head reddish-brown ; eyes large. 



Mesonotum reddish-brown, the praescutum with the four stripes confluent 

 and rather indistinct; humeral regions and the lateral margins more yellowish. 

 Pleura pale with indistinct dark markings, sparsely gray pruinose. Halteres 

 pale, reddish-brown basally, the knobs dark brown. Legs with the coxae pale, 

 sparsely gray pruinose ; trochanters pale brown ; femora pale brown, the tips 

 broadly darkened and weakly incrassated ; tibiae brown, the tips narrowly 



