( 156 ) 

 Key to the genera : 



a. Fore- and midtibiiu; spinose 



,, ,, „ not spinose 



ft. riilvillns absent .... 

 ,, jiresent .... 

 r. Spnrs sliort, tongne sliort and weak, 

 bindvving grey .... 

 Spnrs long, tongne half the length 

 of the body, hiudwing rnfous 

 (/. Foretibia armed with an apical 

 tliorn ; no pnlvillus . 

 Foretibia withont an apical thorn ; 

 pnlvillus present 

 e. No paronychial lobes 



With two paronychial lobes at each side 

 /'. Antenual segments distinctly dilated 

 laterally in dorsal view 

 Antennal segments not dilated later- 

 ally in dorsal view 



b. 

 d. 

 XXXIX. Ilopliocnema. 



XXXVIII. Syiwecliii. 



XXXVII. Tetrachrna. 



XL. Dolhinoj/sis. 



e. 

 X L 1 1 1 . Spltinglu. its. 

 ■ ./• 



XLII. Kentochvi/salis. 

 XLI. Dolbina. 



XXXVII. TETRACHROA gen. nov.— Typns : edwardsi. 



Macrosila., OllifE («o« Walker, 1856), Proc. Linn. Soc. N. S. Wales (2). v. p. 515 (1890). 

 ilcganoton, Kirby {non Boisduval, 1875), Cat. Lep. Ret. i. p. 683 (1892). 



$ ? . Tongne about half the length of the body, rather stout proximally, thin 

 distally. Pilifer with normal brush of bristles ; genal process triangular, as long 

 as the pilifer. Palpus elongate, projecting a little beyond frons in a dorsal aspect. 

 Antenna with end-segment about four times as long as basally high, clothed with 

 broad scales ; $ : not strongly compressed, fasciculated ciliae about half as long 

 as the segments broad dorsally ; ? : cylindrical, ciliae all very short. Fore- and 

 midtibiae spinose ; foretibia ending in a long thorn, with some heavy terminal 

 spines, shorter (thorn excluded) than first tarsal segment ; spurs of mid- and 

 hindtiljiae long, long terminal one of hindtibiae about four-fifths the length of the 

 first tarsal segment ; midtarsus without comb ; hindtarsus half as long again as 

 the cell of the hindwing, first segment much longer than 2 to 5 together ; pnlvillus 

 present., paronvchium with two slender lobes at each side. Spines on abdominal 

 sternites very weak. 



$ . Tenth abdominal tergite elongate, divided at end into two short triangular 

 lobes, which are turned downward. Clasper without patch of modified scales ; 

 subdorsal fold very high, running ventrad at end, armed with spines (PL XXXIX. 

 f. 14) ; harpe elongate-triangular, densely covered with erect scales, dorso-basal 

 margin raised to a high ridge. Tenth sternite and penis-sheath not preserved in our 

 $ specimen ; clasper dorsally also damaged, the fold apparently with spines all 

 along the edge. 



? . Postvaginal part of vaginal plate membranaceous, short, scaled, antevaginal 

 part rather strongly chitinised, proximal edge of vaginal cavity convex, incrassate. 



