220 PROF. M. BEZZI. 



66(65). Wings more or less widened, rounded at end and narrow at base with some 

 hyaline spots in the middle . . . . . . . . Platensina, End. 



67(8). Ocp. composed of strong and usually obtuse bristles, which arepale yellowish 

 or whitish in colour, at least in part ; scp. mostly not or less distinct ; 

 third longitudinal vein bare on the upper side, or exceptionally with a few 

 bristles near the base ; in doubtful cases, either the wings have a reticulate 

 pattern, or the dc. are placed much before the a. sa., or the lower point 

 of anal cell is very short, or the arista is bare, or the coloration of body 

 is much more modest, and entirely without striking markings. 



Subfam. Trypaneinae. 



68(69). Wings with Aciura-\ike pattern, that is, with two hyaline indentations 

 at fore border and three or four at hind border ; a. set. present or 

 absent . . . . . . . . . . . . Tephrella, Bezzi (p. p.). 



69(68 

 70(73 



71(72 



72(71 



73(70 



74(75 



75(74 

 76(81 



77(80 

 78(79 



79(78 



80(77 



81(76 



82(83 



Wings with a different pattern. 



Wings much widened and rounded outwardly, about as long as broad, with 

 the 2nd and 3rd longitudinal veins much diverging distally ; arista shortly 

 plumose or with rather long pubescence. 



Face and frons without black spots ; axillary cell very narrow, narrower 

 than the marginal one ; wings with a few hyaline discal spots 



Platensina, End. 



Fore part of the frons or face with velvety black spots ; axillary cell well 

 developed ; wings with numerous and usually minute hyaline spots on 

 the disc .. .. .. .. .. .. . .Eutretosoma, Hend. 



Wings of usual shape, not or but little widened, at any rate much longer 

 than broad ; arista bare or microscopically pubescent. 



Wings very narrow and long, with parallel sides and with the anal cell 

 obtuse, its lower angle not being acute . . . . . . Elaphromyia, Big. 



W T ings not so shaped, and with the lower angle of anal cell mostly acute. 



Wings with the black pattern more extended than the hyaline one ; hyaline 

 discal spots very few in number, thus the wings not appearing reticulate. 

 W'ing pattern not distinctly radiating at apex and hind border. 



Two i. or. ; proboscis long and rather geniculate ; b. set. very long, the 

 a. set. wanting or rudimentary . . . . . . . . Spathulina, Rond. 



Three i. or. ; a. set. well developed ; proboscis short and simple 



Pliomelaena, subgen. nov. 



Wing pattern distinctly radiating ; proboscis not geniculate ; usually two 

 i. or. and four equal set. . . . . . . . . . . Euaresta, Loew. 



Wings with the hyaline part more extended than the blackish one, or 

 appearing reticulate owing to the numerous discal spots, or being 

 dimidiate, or having a star-shaped apical pattern. 



Head depressed, considerably longer than high, with very narrow jowls ; 

 if head not so depressed, the proboscis very long and geniculate, its 

 terminal part being as long as or longer than the lower border of head 



Ensina, R.D. 



