114 DIPTERA. 



I continue to use Anthrax as feminine, as it has been used since Fabricius and 

 Meieen, although the Greek word is masculine. 



For the easier determination of the species described, or merely mentioned by me, I 

 have constructed an analytical table, based on a purely artificial grouping :— 



Analytical table of the species of Anthrax described below. 



1 (36) . Wings not altogether hyaline. 



2 (3). Wings without any hyaline spaces. 



Wings uniformly dark brown, with bluish reflections . . 1. cyanoptera, Wiedem. 

 Wings uniformly grey, somewhat ferruginous towards the 



base 2. lucifer, Fabr. 



3 (2). Wings partly dark-coloured, partly hyaline. 



Wings with alternate brown and hyaline cross-bands . . 18. castanea, Jaenn. 

 Wings variegate, but not with alternate brown and hyaline 



cross-bands . . 3. arethusa, sp. n. ; 4. pcetilog aster, sp. n. ; S.fuliginosa, Loew. 

 Wings black, brown or brownish on the antero-proximal 



half, hyaline or subhyaline on the postero-distal (4). 



4 (5). Cross- veins and bifurcations (within the brown of the antero- 



proximal part) distinctly clouded with a darker shade of 



brown 6. edititia, Say; 7.paradoxa, Jaenn. 



5 (4). Cross-veins and bifurcations (within the brown &c.) not, or 



indistinctly clouded with a darker shade of brown. 



6 (11). The enlarged distal end of the marginal cell containing a brown 



spot. 

 7(8). Fourth posterior cell altogether hyaline 23. scylla, sp. n. 



8 (7). Fourth posterior cell more or less encroached upon by the 



brown. 



9 (10) A brown spot on the costa at the distal end of the first sub- 



marginal cell 24 - sinuosa > Wiedem. 



10 (9). No brown spot on the costa at the distal end of the first 



submarginal cell ***• S P" ■ 



II (6). The enlarged distal end of the marginal cell hyaline. 



12 (35). The brown of the wings not encroaching upon the second 



submarginal cell. 



13 (20). The anterior and posterior cross-veins, although on dark 



ground, having a distinct pale aureole around them. 



14 (15). Proboscis projecting a long distance beyond the oral margin. 19. rex, sp. n. 



15 (14). Proboscis short, mostly withdrawn, 



16 (19). Anal and axillary cells infuscated (except their extreme 



ends). 



17 (18). Third antennal joint in the shape of a long cone, ending in a 



style n - selene > S P" n * 



18 (17). Third antennal joint short, onion-shaped, with a long style . 21. chimara, sp. n. 



