568 MAJOR K. E. AUSTEN ON TUB 



which extends from the costa to the upper distal angle of the 

 second basal cell and includes the aiiterior transverse vein, 

 resembles the corresponding mark in the wing of P. tabanlnus 

 Thunb., but is more sharply defined ; the veins separating the 

 second posterior marginal cell from the discal cell, and the 

 fifth posterior marginal cell from the second basal cell are each 

 enclosed in a shai^ply deHned, cream-buff" spot; a faint, elongate, 

 cream-bufl' spot is visible on the sixth longitudinal vein, in the 

 centre of the lower margin of the anal cell, and both basal cells 

 are cream-buff" at the base; veins sepia-coloured, except in the 

 lighter areas where they are cinnamon-bufF or pinkish-bnft*, first 

 lono^itudinal vein where enclosed in more distal of the two dark 

 costal areas, and fifth longitudinal vein except at base and tip 

 of second basal cell, darker than most other veins or portions 

 of veins. Hcdteres cinnamon-buff". Legs : hind femora slightly 

 incrassate towards distal extremity; femora, front and middle 

 til)ife, and last four segments of all tarsi russet, russet-brown, 

 or chocolate-brown, hind tibiaj blackish-brown, first segment of 

 all tarsi bright mustard-yellow, narrowly russet-brown at extreme 

 tip, last- segment of all tarsi russet, paler than three preceding 

 segments ; claws russet-brown at base, then blackish-brown or 

 black; pulvilli and empodia ochraceous-buff" or ochraceous-tawny ; 

 femora, front and middle tibisR, and second and two following 

 set^ments of all tarsi clothed mainly with russet-brown, dark- 

 brown, or blackish-brown hair, first segment of all taisi exce[)t 

 extreme tip clothed with glistening Naples-yellow hair, inner and 

 flexor surfaces of front tibise, anterior and posterior surfaces 

 of proximal portion of hind femora, and last segment and 

 extreme tip of first segment of all tarsi clothed with russet-brown 

 or chestnut-brown hair, hind tibife fairly thickly clothed with 

 blackish-brown or black haii*, which, except hair on flexor surface 

 of hind femora, is longer than hair on legs elsewhere. 

 Brazil : Villa Nova, R. Amazons (/f. W. Bates). 

 The species described above, whicli is dedicated to the meinoiy 

 of its discoverer, the well-known author of 'The Naturalist on 

 the River Amazons,' is readily distinguishable from any of its 

 congeners included in the present paper. From P. tahaninus 

 Thunb,, in addition to the points of diflference to which special 

 attention has been shown in the foregoing description, P. batesi 

 is separable, intei- alia, owing to its unstriped tliorax, and, at any 

 rate in the d sex, the silvery sheen on the dorsum of the 

 abdomen. From the two following species, in both of which, at 

 least in the cJ , the dorsum of the abdomen is likewise " silver- 

 washed," P. batesi may be distinguished in the same sex, intej' 

 alia, by its abdomen being narrower and spotted with black along 

 the lateral margins. From P. hellerianus Fnderl., of which a 

 re-description is given below, P. batesi is furtber distinguishable, 

 owing to its much more clearly marked wings, to the presence of 

 dark spots on the thorax, and to the surface of the latter not 

 being silvery. 



