ANTHRAX. 245 



The two specimens alluded to by me in my first paper on 

 BoMBYLiiDiE as allied to A. clara, Walk., are amongst those now 

 referred to wpproximata. 



190. Anthrax aperta, Walk. 



Anthrax aperta, Walker, Ins. Sauud., Dipt. pt. 3, p. 180 (1852). 



S 2 • Head : frons in S sufficiently narrow at vertex for the 

 small ocellar tubercle to touch the eye on each side, in $ broad 

 enough for this tubercle to be quite clear of the eyes ; in both 

 sexes frons broadening to base of antenna?, where it forms one- 

 third of the head, black, covered wholly with black bristles and on 

 the lower part with elongate black or dark brown scales and some 

 shorter yellow or yellowish-white scales intermixed ; face in g 

 wholly and thickly covered with elongate bright yellow scales, 

 with which are intermixed long black hairs, and in the median line 

 from base of antennae to mouth-opening a stripe of dark brown 

 scales ; in $ the face-scales mostly whitish, those in the median 

 line yellowish ; eye-facets small, uniform ; antenna? black, 1st and 

 2nd joints bristly, 3rd onion-shaped, produced into a long bare 

 style. Thorax black, covered with moderately short blackish-brown 

 hairs ; anterior margin with a thick fringe of reddish-tawny 

 bristly hairs, which extend to a considerable portion of the under- 

 side. Sides of thorax with long whitish-grey scale-like pubescence, 

 forming fan-shaped bunches about the humeral and posterior calli, 

 near the wing-base and on the pleura? ; this pubescence varies 

 from nearly white to dirty grey and yellowish. Along the hind 

 border of the mesonotum there is always, in the narrow depression 

 occurring just before the extreme margin, a row of very small flat- 

 lying bright yellow scales.* Scut ell um black, with some soft 

 black hairs and (probably) with whitish pubescence.f Abdomen 

 black ; at base of 2nd segment a moderately wide band of very 

 small flat-lying white scales ; a similar but narrower band of 

 yellow scales at base of 3rd segment and a row of yellowish or 

 whitish (or apparently both intermixed) at base of remaining 

 segments ; rest of surface covered with small flat-lying black 

 scales ; entire dorsum covered with rather long fine dark brown 

 hairs, which along the basal bands of pale scales appear to be 

 replaced by whitish ones. Sides of abdomen thickly clothed 

 on first two segments with long bushy scale-like whitish hairs ; 

 on 3rd segment with long very dark brown scales and hairs, which 

 extend a little over the sides of the 2nd segment ; on 4th segment 

 with elongate white scales, connected with the basal cross-band 



* A few of these generally remain even in badly-denuded specimens, but 

 there seems no reason to infer that they extend beyond the narrow space 

 described. 



f This is conjecture, not one of the specimens before me bearing any 

 pubescence. 



