EEV. A. E. EATOX OX EECEXT EPHEMEEID.E OE MAYFLIES. 135 



the irregularly sublinear marginal area is broadest in proximity to the great cross vein ; 

 the submarginal area, widest at the anterior angle of the wing, and subtriano-ular in 

 form, with its outer side slightly concave, contains a few traces of obsolescent cross 

 veinlets, of which another is sometimes distinguishable in the next area subjacent. 

 In the fore wing, most of the intercalary nervures are rudimental and isolated ; the cross 

 veinlets are absent from the portion of the marginal area preceding the pterostio-matic 

 region, as well as from the terminal margin, but are numerous elsewhere in advance of 

 the anal (8) nervure, although obsolescent in parts. The intercalar neuration of the 

 anal-axillar interspace of the same Aving is less scanty in larger specimens than in the 

 small example figured ; but the series of adults available for comparison is too limited 

 for descriptive purposes. Forceps-limbs of d 3-jointed ; the proximal joint stout, taperino- 

 distally from the base, and rather longer than the slender second joint ; terminal joint 

 short and small. Porceps-basis entire, and seemingly very short ; ventral lobe of 2 

 segment 9 obtusely rounded off and entire. Penis-lobes linear or subulate, and con- 

 tiguous. Median caudal seta aborted ; outer setae about twice as lona; as the 2 bodv. 

 Tarsal ungues each unlike the other in every leg. Fore tarsus shorter than the d tibia ; 

 its joints in diminishing sequence rank 2, 3, 5, 4, 1 ; the other proportions of the legs 

 are unascertainable. 



Nymph unknown. 



Type. T. tristis (in Cloe), Hag. 



Distribution. Ceylon. 



Etymology. rt-Xo? and -yaiwSijc, in allusion to the wings becoming clear and bright in 

 the imago. The type was named tristis from the dinginess of the wings of the sub- 

 imago, — heretofore the only grade described. 



Teloganodes tristis, Hagen. Plate XV. 24- bis (wings). 



Cloe tristis, \ Hag., Yerli. zool.-bot. Gesells. Wien, viii. 476 (1858); Etn., Trans. Ent. Soc. London 

 (1871), 131, note. 



Leptoptilebia [Etn.] tristis, Hag., op. cif. (1873), 394. 



Teloganodes [type] /m^is, ! Etn., Ent. Mo. Mag. xviii. 208 (1882) [undescribed] . 



Subimago {dried), 2 . — Wings translucent, talcose, deep Avarm-sepia brown verging 

 upon sooty black ; neuration sometimes like-coloured, but at others many of the longi- 

 tudinal nervures are black : the pterostigmatic space of the fore wing contains about 9 

 nearly straight simple cross veinlets at some distance from the bulla. Legs pale, sub- 

 lutescent varied with piceous ; the fore femur, the base and a subterminal band or spot 

 of the fore tibia, and the terminal joints, ungues, and the extreme apical borders of the 

 other joints of all the tarsi, besides the apical projections of the hinder femora, pitch- 

 brown; the apical spinule, and a streak along the upper terminal border of every coxa 

 black. Setaj pale sepia-grey, with black joinings. Abdomen discoloured ; thorax pitch- 

 brown ; oculi during life {teste Isietner's MS. ticket) black. 



Imago, ? (f/;v'e(7).— Wings transparent, very faintly tinted with extremely pale smoke- 

 grey : longitudinal nervures (excepting near the wing-roots), the extreme edges of the 

 wing, and the cross veinlets of the pterostigmatic space of the fore wing, black ; wing- 



18* 



