232 EEV. A. E. EATOX ON EECENT EPHEMERID.E OR MAYFLIES, 



grey, rubigiuose at the roots. Length of body 13-15 ; wing, 6 14-15, 2 10-17 ; setse, 

 $ im. 22, subim. 12 mm. 



Hab. Holland ; near Rotterdam (Fransen) and near Arnhem (Van Medenbach de 

 Rooy) in Albarda's Mus. A single Ametropus withont locality, in Dr. Hagen's collection, 

 was sent to me amongst Uphemeridcs collected chiefly in southern Russia, Caucasus, and 

 Armenia. 



ATOPOPUS, Etn., 1881. 



Illustrations. Adult (details), PL XXII. 32. 



Adult, cJ . — Pore leg about as long as the body ; tarsus about If as long as the tibia, 

 and this nearly 1^ as long as the femur ; the tarsal joints in order of shortening rank 1, 

 2, 3, 4, 5, and the first is about 1^ as long as the second, and nearly | as long as the 

 tibia. Hind tarsus twice as long as the tibia, and this about -^^ ^^ long as the femur ; 

 the joints in order of shortening rank 1, 2, 3, 5, 4, and the first is about 3-g as long as the 

 second, and upwards of 1^ as long as the tibia, — the excess is larger in the intermediate 

 leg. Ungues each unlike the other in every tarsus. In the anal-axillar interspace of the 

 fore wing the two intercalary nervures nearest to the anal (8) are shorter than the other 

 couple. Costal dilatation of the hind Aving angular in front ; axillar region of minimum 

 l^roportions. Porceps-basis transverse, widely excised behind, with the sides of the 

 excision convergent towards a narrow low prominence at the bottom. Porceps-limbs 

 virtually 3-jointed. Setae about twice as long as the body; the median aborted. 



T//pe. A. tarsalis, Etn. 



Distribution. Borneo. 



Etymology . utottoc and -kdvc, from the strange proportions of the hinder tai'si. 



Atopopus tarsalis, Etn. Plate XXII. 39 (wings, legs, genitalia d ). 

 Atopopus [type] tarsalis, ! Etu., Ent. Mo. Mag. xviii. 22 (1881). 



Imago [dried), d . — Body pitch-black above, with the abdominal pleurfc and terminal 

 segment flavescent ; venter and forceps pitch-brou n ; setfc pitch-black. Pore leg pitch- 

 black ; the femur pitch-brown from the base to about the middle ; the tarsal joinings 

 whitish beneath. Hinder femora in opaque view pitch-brown ; tibiae flavescent ; tarsi 

 brownish : in transmitted light the femora become translucent brownish, the tibiae 

 yellow-amber, and the tarsi yellowish with a suifusion of rather deep smoky grey. Wings 

 vitreous, with pitch-l)rown markings and black neuration ; the markings comprise the 

 marginal area of the fore wing beyond the middle and, in part, nearer the base, the 

 submargiual area almost to the base, and a narrow patch on the terminal margin near 

 the anal angle ; in the hind wing the apex and terminal margin are likewise narrowly 

 bordered with the same colour. Length" of body, d , 9-10, wing 11, seta3 20 mm. 



Hah. Labuan (M'^Lach. Mus.). 



THALEROSPHYRUS, Etu. 1881. 

 Ilhfstrations. Adult (details), PI. XXII. 40. 

 Adult, d . — Pore legs defective in the specimens examined. Hind tarsus as long as the 



