:megaspjs. 197 



3 b. Anterior half of wing dark brown, hinder 



halt" yellowish-grey (black species witli 



broadly onmge tomeiitose front margin of 



thorax; 2nd abdominal segment mainly 



deep orange) (e.<;i/mnus,'\\ii]]i., p. 200. 



3 c. J^asal half of wing not black, normally at 



most only (with central and anterior part 



also more or less) a little tawny-brown. 1. 

 4. Femora iinicolorous, Aarying from light 

 brown to blackish ; hind pair never 

 tawny on basal half and dark on apical 

 half; thorax with a broad black trans-- 

 verse band across middle; w'ings brow-n- 

 ish or yellowish about the middle and []>. 201. 



base <ir(/yrocep]i(duH, Macq., 



Femora wholly quite black ; hind })air Avith 

 short, still, bristly hair; thorax blackish, 

 AA'itli pubescence close, black, yellowish or 

 reddish anteriorly ; wings nearly clear, a 

 distinct blackish-brown suffusion in middle 

 of anterior border, and to some extent at 

 base zonatiis, Falir.. p. 203. 



156. Megaspis ci'assus, Fair. (PL IV, lig. 19.) 



Syrplms cra^sus, Fabricius, Mant. Ins. ii, p. 334 (1787). 

 Eristalis crassus, AViedemann, Auss. Z\A-eiH. ii, p. 153 (1830). 

 DoUchomenis crassus, Macquart, Dipt. Exot., Suppl. iv, p. 132, 



pi. xii, fig. 15 (1849). 

 Syrplms merjacephalus, Fabricius, Ent. Svst. (Suppl.) p. oOl 



(1798). 



c? $. Uecul ill ^ black, frontal calitis occupying greater part 

 of frontal triangle, Avhicli latter bears blackish-brown pubescence; 

 vertical triangle almost bare; eyes contiguous for a long space, 

 upper facets considerably larger than loAver ones ; bind margin of 

 eyes on lower half with silvery-white tonientiim ; a little white 

 pubescence on lower part. Antenna) black, arista orange, plumose 

 on basal half. In V ? frons at A^ertex less than one-fifth, at level 

 of antennae barely one-third, Avidtli of head ; frons and face together 

 Avith straiglit sides, Avhich do not diverge from top to bottom so 

 much as in clirysopyijns, btit in all else as in chrysopyrjus. Tliova.v 

 and scutellum siiiniug black. ylicZo«/CH shining bl;ick, bare; 2ud,;3rd 

 and 4th segments each Avith a rather deep impression of a large 

 circle, its upper part phiced on anterior margin ; 2nd segment w itli 

 a little snow-white tomentose pubescence on extreme anterior 

 margin ; 3rd and 4tli segments Avith an oblique im])ressed line on 

 each side on hinder half, and a yellowish-grey tomentose spot on 

 anterior margin on each side of tlu? circle; 4th .segment with an 

 additional spot on each side at the base of each oblique line, con- 

 tignous to the impressed circle. This circle, a broad spot on each 

 side of anterior margin, and the hind margin more or less, are 

 a?neous in some specimens ; 2nd and 3rd segments Avitli yelloAvish- 

 Avhite, scale-like, pubescence at extreme sides; 4th at sides, and 



