ABT. 20 REVISION OF THE GENUS WINTHEMIA KEINHAKD 6 



Generic characters (from the type species). — Head wider than 

 high, the length at vibrissae shorter than at antennae, posterior 

 surface flattened or but slightly bulging below. Eyes densely hairy, 

 in profile extending below level of vibrissae. Antennae inserted 

 above middle of eye, third joint one and one-half times the length 

 of second; arista bare, a little longer than antennae, with short but 

 distinct basal joints. Face somewhat receding, moderately exca- 

 vated and slightly keeled; ridges bare except a few hairs at base; 

 parafacials hairy. Oral cavity large, in profile the lower margin 

 straight behind and sloping abruptly upward on about the anterior 

 third; vibrissae somewhat approximated, situated near level with 

 front border of oral margin but distinctly above the lower edge of 

 head. Front rather prominent below, much narrowed above in male, 

 not in female. Proboscis very short, stout, labella large and fleshy; 

 palpi normal in size. Cheeks in profile one-seventh the eye height,, 

 thickly clothed with fine hairs. Frontal bristles in two rows, which 

 diverge below base of antennae and extend to apex of the second 

 joint, in male all bristles directed inward, becoming smaller above, 

 stopping before triangle, in female the two uppermost larger and 

 reclinate; verticals two pairs, outer ones small or hairlike in male; 

 two pairs of orbitals in female, none in male; ©cellar bristles pres- 

 ent, proclinate, behind the ocellar triangle another pair, erect, and 

 still another but wider-spaced pair behind these on the occiput. 

 Posterior orbits moderately wide below, narrowed and almost linear 

 above, the occipital fringe with some long hairs above the middle 

 and only pale ones behind. 



Thorax a little narrower than head, viewed from above distinctly 

 longer than broad with the sides nearly parallel, suture well before 

 middle ; humeral and pleural hairs black, some with noticeable wavy 

 tips. Chaetotaxy: Acrostichal, 3, 3; dorsocentral, 3, 4; humeral, 5; 

 posthumeral, 2 or 3; notopleural, 2; presutural, 2; intraalar, 3 (none 

 near suture) ; supraalar, 3; postalar, 2; mesopleural, 7 or 8 behind, 

 3 at lower front angle; propleural, 2; pteropleural, 1 (small) ; hypo- 

 pleural, 6 to 8; sternopleural, 1, 1; scutellum with three lateral, one 

 smaller decussate apical, and one discal pair. Postscutellum well 

 developed; postnotum beneath calypter bare; prosternum with fine 

 hairs at sides. 



Abdomen short ovate and rather flattened ; intermediate segments 

 without discal bristles; first with a pair of median marginals; second 

 also usually bearing one pair (sometimes two or more) ; third with a 

 marginal row of about 10; fourth with two irregular rows near the 

 apex. Male genitalia small and retracted, with the usual inner and 

 outer forceps, the former united except near apex and keeled behind, 

 the latter thin or flattened structures tapering outward from base. 



