NOVITATES ZoOLOGlCiE XXV. 1918. 83 



15. Tricentxa gibbimargo sp. nov. 



$,18 mm. Head and body dull purplish above, mostly oolireous whitish 

 beneath ; some whitish scales across vertex between the antennae. Leg^ whitish, 

 the fore and middle pairs marked with purjsle above and on innerside. 



Wings shaped as in commixta \A'arr. (Novitates Zoologicae, xii. 325) or 

 with the distal margin of forewing even more extremely convex. 



Forewing vinaceous-rufous to brick-red, with blackish-slaty suffu.sions in 

 posterior half from base to outermost line (strongest in distal part) and more 

 feebly before the apex ; costal area relieved w ith some light scales ; lines 

 dark grey ; antemedian from one-fourth costa, oblique outward to middle of 

 cell, here strongly bent ; two outer dentate, parallel with one another and 

 approximately with the distal edge of the ground-colour, distally edged with 

 some yellow scales ; cell-mark as in commixta ; extreme apex and fringe pale 



yellow, the latter less pure posteriorly than anteriorly. Hindwing with the 



brick- red element and admixture of yellow scales somewhat stronger at base 

 and in the region of the two outer lines ; yellow cell-mark narrower than on 

 forewing, almost interrupted in middle ; distal margin extremely narrowly pale 

 yellow, crenulate-edged proximally ; fringe pale yellow. 



Underside more uniform, glossy vinaceous grey ; base and hindmargin of 

 forewing, base of hindwing, both cell-marks, apex of forewing and fringes whitish 

 yellow. 



St. Jean du Maroni, French Guiana. Type in coll. Tring Museum. 



16. Tricentra(?) amibomena sp. nov. 



?, 17 mm. Face whitish. Head and body above vmaceous-buff, with 

 slight purplish suffusions, the patagia more yellowish ; underside and legs pale. 



Foreiving rather broad, costa shouldered at base, then straightiih, apex 

 almost rectangular, termen rather suddenly bent behind M' ; areole single, SC 

 arising before its apex ; pale cream-buif to vmaceous buff, with some coarse 

 reddish u-roration, an ill-defined distal area between R' and hindmargin more 

 purplish, a small apical patch narrowing to a point before R' clear cream-buff ; 

 antemedian and median lines zigzag, smoky, ill-defined ; postmedian slightly 

 oblique and straightish from beyond two-thirds costa to M', here angulated, thence 

 zigzag to hindmargin, accompanied by a small dark spot proximally in sub- 

 median area ; two ill-defined ochre-yellow blotches in middle of wing, the first 

 bounded distally by the antemedian line, the second and larger by the cell-mark 

 and median shade ; cell-mark white, double, nearly confluent (the posterior 

 elongate) ; some slight ochre-yeUow shading distally to the postmedian line ; 

 an ill-defined straightish dark line or shade jiroximal to the pale apical patch ; 

 terminal line mostly very feeble, thickened between R' and M^ ; fringe yellowish 



cream-buff, dark-mixed opposite R^ — M^ Hindwing with costa relatively 



long, apex round-pointed, termen little convex ; buff-yellow, with some dull 

 reddish and violet-grey krorations in places, condensed into small subbasal 

 spots, irregular, more or less confluent spots along abdominal margin, small 

 costal patches near base and at origin of a faint wavy postmedian line, and at 

 distal margin, especially in abdominal half ; cell-dot white, small. 



Foreiving beneath with the cream-buff and ochre-yellow parts paler, costal 

 and apical regions somewhat vinaceous, distal half otherwise somewhat strongly 



