Vol. Xxiii] ENTOMOLOGICAL NEWS. 7 I 



age growing amongst shrubbery. June 27, 1910, "Very com- 

 mon on the rank herbage of the northeast coast and specimens 

 could be found in my net at every sweeping. Hundreds if 

 not thousands of specimens about." June 21 and 28, 1911, 

 common on Sport Is. 



55. Sacandaga flava Alex. 



Locally common. 



Since describing the genus Sacandaga (Ent. News, Oct., 

 1911), I have come to the conclusion that the insect is most 

 closely related to the genus Rhabdomastix, Skuse* of Australia. 

 The differences between the two genera are rather numerous, 

 but the resemblances, especially in the genitalia of the male 

 and in the venation, are great, and it is possible that Sacandaga 

 will, upon further study, be relegated to subgeneric rank. The 

 genera should have been compared in the original description, 

 but 1 was not in possession of Skuse's detailed description of 

 Rhabdomasti.v at the time. This comparison is supplied in the 

 following key: 



A. Antennae very long, filiform, nearly twice the length of entire 

 body. Wings cuneiformly narrowed towards the base, with only 

 a slight indication of an anal angle. Halteres, long, slender. Vena- 

 tion : Sc rather short, tip of Sci remote from the tip of Ri ; Sc 

 beyond origin of Rs, twice the length of the cross-vein r-in. Sc2 

 absent or indistinct at tip of Sci. R2+3 (petiole of second sub- 

 marginal cell of Osten Sacken) one-half of cell R2. Cross-vein 

 r-m as long as the basal deflection of Cut. Second anal short, 

 curved Rhabdomastix Skuse. 



AA. Antennae normal reaching about to the root of the wings. Anal 

 angle present and prominent. Halteres short, abruptly capitate. 

 Venation : Sc long so that Scr and Ri are somewhat approxi- 

 mated at the tip; Sc long, beyond the origin of Rs, four times the 

 length of the cross-vein r-m. Sc2 conspicuous, removed from the 

 tip of Sci. R2 + 3 equal in length to, or longer than, cell R2. Cross- 

 vein r-m much shorter than the deflection of Cut. Second anal 

 prominent, bisinuate Sacandaga Alex. 



*Diptera of Australia, by F. A. A. Skuse. Proc. of the Linnaean 

 Society of New South Wales; vol. 4 (series 2nd) (25th Sept., 1889); 

 P. 828, 829; PI. 22, Fig. 15 (wing) PI. 24, Fig. 57 ($ genitalia). 



