EEV. A. E. EATON ON EECENT EPHEMERID.E OR MAYFLIES. 89 



in opaque view, of a dull colour approaching brown-ochreous, the femora banded in the 

 middle and distally with light burnt-umber brown, the tarsi and hinder tibiae much 

 lighter in colour than the femora, with a dark spot at the extremity of the fore tibia, and 

 with the ungues, the extremities of the terminal joints, and the extreme distal edges of 

 the remaining tarsal joints light burnt-umber, or almost madder-brown. Fore wings 

 vitreous, with the marginal and submarginal areas, the costa, subcosta and radius, and 

 the bases of the other longitudinal nervures light raw-umber brown, changing in trans- 

 mitted light to light brownish-amber ; the remainder of the longitudinal neuration and 

 many of the cross veinlets in the outer and hinder portions of the disk of the wing are 

 pitch-black in opaque view, changing in other lights to pitch-brown ; but the stronger 

 cross veinlets near the base and those between the great cross vein and the bulla in the 

 marginal and submarginal areas, being slightly thickened, are more constantly black ; at 

 the wing-roots all of the strong nervures are light raw-umber or brownish amber ; the 

 marginal area contains 8 cross veinlets before and 15 beyond the bulla, all of them 

 simple. Length of body, 2 im. 11, wing 16, setse 23 and 22 mm. 



Hab. North Austi-alia. This description is prepared from the original type specimen 

 in M^Lach. Mus. The dimensions formerly attributed to it were very inaccurate. 



Atalophlebia costalis, Burm. 



IBaetisW costalis, Burm., Handb. d. Ent. Bd. ii. Abth. ii. 800 (1839). 



Potamanthus costalis, Pict., Hist. Nat. Nevropt. ii. Ephem. 237 (1843-5) ; Walk., List of Ncuropt. 

 Ins. in Brit. Mus. part iii. 546 (1853). 



Leptophlebia costalis, Etn., Trans. Ent. Soc. London (1871), 81. 



Subimago {dried). — Black ; thorax with a whitish line in front of the wings ; abdomen 

 and legs banded with red. Wings suffumatose, with all the cross veinlets in the mar- 

 ginal and submarginal areas of the fore wing brownish. Length of body, 6 6 Paris 

 lines. (After Burm.) 



Rab. Australia. 



Atalophlebia nodularis, Etn. Plate X. 16 e (hind wing and two views of penis). 



Leptophlebia nodularis, ! Etn., Trans. Ent. Soc. London (1871), 81, pi. iv. 20-20 c [details]. 



Subimago (dried). — Wings light sepia-grey, with dark neuration ; cross veinlets, of the 

 fore wing only, bordered with medium sepia, their bordering in some measure confluent 

 in the disk near the subcostal bulla (which itself is surrounded by a darker spot), and 

 again beyond this about midway towards the tip, so as to form an ill-defined irregular 

 cloud enclf)sing a lighter space of the ground-colour. 



Imago {dried), 6 .—Thorax piceous or pitch-black. Abdomen discoloured, pitch-black, 

 with translucent subtriangular spaces in segments 2-5, one on each side of a dark median 

 longitudinal line, extending from the base nearly to the hinder border of the dorsum. 

 Seta; yellowish white, annulated broadly with pitch-brown in the alternate joints. Wings 

 vitreous, with pitch-black neuration ; fore wing, in opaque view, with the marginal and 

 submarginal areas, from the great cross vein to the roots, raw-umber brown, and with 

 narrow dark borders to the cross veinlets, nearly effaced in the disk, but subopaque in the 



