CHARLES P. ALEXANDER 251 



Genus POLYMERA Wiedemann 

 1821. Poly incr a Weidemann, Dipt. Exot., i, 40. 



The species of this interesting genus have been considered by the 

 author in earHer papers; the student is referred to the Proceedings 

 of the U. S. National Museum, xHv, 526 to 535. 



Polymera hirticornis P'abricius 



1805. ChironoviHfi hirticornis Fabricius, Syst. Antliar., 46. 



Bartica, one male on January 28, 1913; two females on February 

 11, 1913, March 1, 1913. 



Polymera niveitarsis Alexander 



1913. Polymera niveilarsix Alexander, Proc. U. S. Nat. Alus., xliv, 532. 

 Bartica, one female, February 14, 1913. 



Polymera obscura Macquart 



1838. Pidymera obscura Macquart, Dipt. Exot., i, pt. 1, 65. 



Bartica, one male, December 30, 1912. Mallali, one female, 

 March 13, 1913. 



Polymera conjuncta Alexander 



1913. Polymera conjuncta Alexander, Proc. U. S. Nat. Mus., xliv, 529. 



Bartica, one specimen, sex uncertain, January 13, 1913. Mal- 

 lali, one female, March 15, 1913. 



Polymera pulchricornis sp. n. 



Size medium; flagellar segments of the male antennae bi-nodose; wing 

 with cell Ml present; tarsi uniformly brown, similar in color to the rest of 

 the legs; thoracic pleura with a prominent black stripe. 



MaZe.— Length, 4.4 to 4.5 mm. ; wing, 4.6 to 4.7 mm. ; antennae about 

 7 mm. 



Female. — Length, 5.7 nun. ; wing, 5.2 mm. 



Male. — Rostrum and palpi brown. Antennae very long and delicate, 

 about half as long again as the body; segments brown, darkest at the nodes 

 which arc provided with groups of long out-stretched hairs; flagellar seg- 

 ments bi-nodose. Head grayish. 



Thoracic dorsum light brown, unmarked. Pleura with a very broad 

 dark brown lateral stripe ; sternites and coxae light yellow. Halteres brown. 

 Legs with the coxae as described above; trochanters dull yellow; femora 

 light brown; tibiae and tarsi of all the legs brown. Wings with a light gray- 

 ish brown suffusion; stigma not present. Venation: (see plate IV, fig. 10) 

 Cell M\ present; cell M3 as long as its petiole; the space on R\ beyond r about 

 one-half that of Ri between Scn and r. 



TRANS. AM. ENT. SOC, XL. 



