1879] 120 



(a. figs. 2 and 3) and innermost (b. figs. 2 and 3) sub-costal neiTures,* at their 

 junction with the vein closing the discoidal cell, is rather broader than in 

 P. Pluto ; none of the nervures dilated at the base. 



Type, JErehioIa Butleri. 



The accompanying diagrams on Plate i represent 



Fig. 1. The disposition of the nervures in the primary wings of Erehia 



Blandina. 

 Fig. 2. Do. do. of P. Pluto. 



Fig. 3. Do. in the primary and secondary wings of Erehiola Butleri, 

 and are given for comparison ; the figures enlarged to two diameters. 



Not having tlie descriptions of all the genera of the Satyrince, I 

 should hesitate in forming a new genus for this insect ; but, as " the 

 lower radial of primaries emitted above the angle of the disco- 

 cellulars instead of below it" is given by Mr. Butler (Ent. Mo. Mag., 

 xiii, p. 152) as one of the distinctive characters of his new genus 

 Percnodaimon, and as the present butterfly has the like character, 

 but disagrees with JBercnodaimon in the form of the club of the 

 antenna?, and the presence of the first sub-costal nervure,t I may 

 reasonably assume that it diifers from all the other genera, and have 

 therefore ventured to describe it as belonging to a new genus. 



Erebiola Butleri, n. sp. 



Primaries. Upper-side smoky-black ; a white-pupilled black ocellus between the 

 externo-medial and innermost sub-costal nervures, and equidistant between the 

 discoidal cell and hind margin. 



Under-side ferruginous, suffused (except the apical and hind marginal area), with 

 slaty-black ; ocellus as on upper-side j sub-hind-marginal row of four whitish 

 marks — the two nearest the apex being the more distinct and silvery — followed 

 by a dusky shade on their outer margin. 



Secondaries. Upper-side smoky-black : a transverse row of three minute white 

 dots near the hind margin ; the dots arranged in a straight line, pointing 

 towards the anal angle, and situated respectively between the externo-medial, 

 eub-externo-medial, interno-medial, and sub-interno-medial nervures. 



Under-side ferruginous, suffused with a dusky shade from the base to the transverse 

 row of spots ; a longitudinal discoidal streak of silver ; a transverse row of 

 three silvery spots near the hind margin, followed by two small longitudinal 

 silvery streaks near the anal angle ; also a small longitudinal streak of silver 

 between the latter streaks and the base of the wing ; the transverse row of spots 

 consists of a conical spot — between the externo-medial and sub-externo-medial 

 nervures — with its apex pointing to the hind-margin, a sagittate spot between the 

 sub-externo-medial and interno-medial nervures, and a similar one between the 

 externo-medial and sub-externo-medial nervures, all boi'dered internally with a 

 dusky shade, the latter two spots pointing towards the base of the wing, and 

 each followed towards the hind margin by a small silvery dot, between which 



* The Oi-ismology in Kirby and Spence's Introduction to Entomology (the only authority I 

 have) is followed in describing the nervures. — R. W. F. 



t As Mr. Butler does not mention the absence of this nervure in describing his genus 

 Percnodaimon, I imagine he must have overlooked it. — R. W. F. 



