84 INSECUTOR INSCITI^ MENSTRUUS 



the stout upper pair reclinate, the second sHghtly so ; posterior 

 dorsocentrals 3 large; anterior acrostichals 1 or 2 large, none 

 immediately before the suture; scutellum with a long apical 

 pair, one still longer at side, and one at base higher up, as 

 well as a smallish, variable discal pair ; sternopleurals 2 or 3 ; 

 first abdominal segment usually with a large median marginal 

 pair, second to fourth abdominal segments always with discals 

 as well as marginals. 



In the male sex the two genera are readily separated, since 

 in Pseudeuantha the abdomen is normal, while in Uramyia the 

 fourth segment is acutely produced dorsally beyond the geni- 

 talia into a more or less tail-like process, and the genitalia are 

 somewhat concealed in the anterior part of an ovate cavity 

 under the tergite. The peculiar "tail" is best developed in 

 producta; as it is variable and decreases through the three 

 species I have seen, and has no counterpart in the female, it 

 should not be given too much taxonomic value. 



But little has been published about the females of the 

 tropical species, and they are not certainly identified in the 

 National Museum collection. Those of Uramyia do not have 

 any corresponding process, and at present the genera are 

 difficult to separate in this sex. 



Genus Uramyia Robineau-Desvoidy 



Robineau-Desvoidy, Myodaires, 1830, 204. Sole species, U. pro- 

 ducta, new. 



Macquart, Dipt. Exot., Suppl. i, 1846, 296 (sep. 168) (Aporia, 

 sole species, A. quadrimaculata, new). 



Schiner, Novara Reise, 1868, 319 (Aporia). 



Bigot, Bull. Soc. ent. France, 1885, xxxiii (Oxydexla, sole spe- 

 cies, 0. acuminata, new). 



Van der Wulp, Tijdsch. v. Ent., xxx, 168, 1887; Biologic, Dipt, 

 ii, 1891, 251. 



Brauer u. Bergenstamm, Zweifl. Kais. AIus., iv, 1889, 130 ; vi, 

 1893, 135 (Uramyia and Aporia). 



Townsend, Muscoid Flies, 1908. 67 (Ncaporia, new name for 

 Ap&ria, preoccupied). Proc. Ent. Soc. Wash., xiv, 1912, 48 

 (Paraporia. new name for Neaporia. preoccupied) ; Proc. 

 U. S. N. M., vol. 49, p. 626, 1916 (Uromacquartia, type 

 halisidotae, new). 



