96 Rey. A. H. Haton’s Monograph 
Cenis hilaris. 
Ephemera hilaris, Say, 1839; C. hilaris, Walk. 1853. 
Imago,v.s.?. “Thorax pallide fulvus, alis costas versus 
obscuris. Abdomen album, segmentis apicalibus singulis 
utrinque punctis tribus fuscis.” (Say, abstract.) 
Long. corp. 2 mm. 
Hab.—Indiana. September. (Say.) 
Ceenis perpusilla. 
C. perpusilla, Walk. 1853. 
Imago, v.s.s. &. “ Testacea; ale antice sub-cine- 
rez: pedes setzeque albi.”’ 
Long. corp. 2°5, set. 12, exp. al. 6 mm. 
Hab.—Ceylon. (Walk.) 
Cenis discolor. 
Oxycypha discolor, Burm. 1839; Canis discolor, Pict. 
1843-5 ; Cloeon discolor, Walk. 1853. 
Subimago,? s.s. ‘‘Supra cinerea, subtus pallida; alis 
infuscatis, costa obscuratiori ; his filamentisque analibus 
longius pilosis.” 
Long. corp. 2 2°5 lin. 
Hab.—Cape of Good Hope. (Burm.) 
Cenis argentata. 
C. argentata, Pict. 1845-5. 
(Confer cum C. macrura et C. dimidiata.) 
Subimago, s. s. ‘ Caput et thorax grisei, fulgore 
argenteo; prothorax vix clarior. Ale grisez, costis 
subcostisque nigris. Pedum antici grisei; posteriores 
albi. Abdomen basin versus griseum, apice albo. Setz 
albee, vix nigro annulatis.” (Pict.) 
Long. corp. ? 4, exp. al. 8, set. 3 mm. 
Hab.—Sicily. (Pict.) 
