﻿26 THE ENTOMOLOGIST. 



form a continuous comb which is not interrupted at the apex (fig. 2). 

 The bristles on the outer surface of the hind tibia are almost evenly 

 distributed between the ventral and dorsal edges. 



Modified Segments. — S ■ The manubrium (M) of the clasper 

 (fig. 1) is widest in the centre. The clasper bears two large and two 

 smaller bristles at the proximal dorsal angle, and two long bristles 

 further down ; the process (P) of the clasper as well as the movable 

 process (F) are slenderer than in S. simsoni. The horizontal arm of 

 the ninth sternite (ix. st.) is narrower than in simsoni ; its stout 

 apical bristle is half as long as the subapical one, the latter being 

 longer than in simsoni. The anal tergite bears a dorsal median row 

 of three or four bristles and a lateral row of two or three, the last 

 bristle of each row being placed at the apex of the segment. — S' ■ 

 The eight tergite (viii. t.) has a row of four to six bristles above the 

 stigma, the row being continued down to the ventral margin of the 

 tergite, and accompanied by another row, there being additional 

 bristles near the ventral and at the apical edges, the segment having 

 thirty to thirty-four bristles altogether on each side. The apex of the 

 segment is less pointed than in simsoni. The ninth tergite (ix. t.) 

 has two or three bristles close to the base of the stylet (Sty.), which 

 is long, cylindrical and slightly curved, and an apical row of four on 

 each side. The anal tergite (x. t.) bears two long dorsal bristles 

 accompanied as a rule by one or two small bristles, and has 

 one lateral bristle ; the sternite (x. st.) bears on each side a row of 

 three bristles at the dorsal margin, and one or two bristles ventrally. 

 The head of the receptaculum seminis (fig. 4) is twice as long as it is 

 broad, being also much longer than the tail. 



A series of both sexes from Emerald, Victoria, obtained on 

 Epimys assimilis by Mr. Ed. Jarvis. 



Explanation of Plate. — Fig. 1. Male organs of Stephanocircus 

 jjeciinipes ; M. = manubrium ; P = non-movable process of clasper ; 

 F = movable process of clasper ; ix. st. = ninth sternite ; Par. == parameres 

 of penis. Fig. 2. Fore tibia (of male). Fig. 3. Last three abdominal seg- 

 ments of female ; t.= tergite ; st. ■= sternite ; sty. = stylet. Fig. 4. Kecep- 

 taculum seminis. 



THE BUTTERFLIES OF THE BUCKS. CHILTERNS. 



By H. Rowland-Brown, M.A., F.E.S. 



Prior to the extension of the Metropolitan Railway to 

 Aylesbury, the greater part of the country with which these 

 observations are concerned was, entomologically speaking, terra 

 incognita. The Chiltern Hills bisect the county of Buckingham- 

 shire at its narrowest east and west borders ; that is to say, from 

 the point where Hertfordshire is driven wedge-like north-west of 

 Tring as far as Wingrave, to the eastward face of Bledlow Ridge 

 looking towards Princes Risborough, and round to the Wycombes. 

 Though to-day something of suburban London has followed the 

 line even as far away as this, there still remains, and is likely to 



