LIFE-HISTORIES. 335 



Erebia ninestra. — The egg is upright, plump, somewhat cylindrical 

 (perhaps more like a truncated cone, with the base but little wider 

 than the apex), the height about equal to the diameter; of a pale 

 yellow colour ; the surface shining and covered with many exceedingly 

 fine longitudinal ribs, of which (with the power at disposal) I make 

 about 42 at the widest part ; these anastomose somewhat towards the 

 apex, and end, as ribs, just over the shoulder of the eggs. 

 The apical area of the egg appears to be somewhat pitted, the part 

 immediately surrounding the micropylar rosette being fairly smooth. 

 Between the longitudinal ribs are many faint transverse ribs, giving 

 the familiar latticed appearance noticed on the sides of this and so 

 many other eggs. [The eggs described were obtained by the dissection 

 of a 5 captured on August 9th, 1903, at Arolla. The description was 

 made on August 10th.] 



Melitaea didyma. — The egg is upright, of a bright green colour, 

 somewhat conical in outline ; the height : width as about 4 : 3, but 

 with considerable variation in size. There are a number (? 18) of dis- 

 tinct longitudinal ribs, extending from the base to the shoulder of the egg, 

 where they anastomose, and finally form a distinct ring surrounding a 

 flattened apical area ; the structure of the micropyle is not to be made 

 out with the power at disposal. The base is flattened, and apparently 

 somewhat depressed. [The eggs from which this description is made 

 were laid in a heap in a collecting-box by a $ taken between Useigne 

 and Evolene, on July 28th, 1903, and were described on August 7th.] 



Brenthix pales. — The egg is upright, of a pale orange colour, finely 

 ribbed from base to apex. It is conical in outline, tapering to a some- 

 what blunt point, on which is placed the micropylar rosette. The 

 ribs appear to be about twenty in number, several of them anastomosing 

 before reaching the shoulder of the egg. [This note was made on 

 August 10th, 1903, from an egg obtained by dissecting a 5 captured 

 the preceding day at Arolla.] 



Arfiynnh niobe. — The egg is upright, very small for the size of the 

 insect, bright orange in colour, conical in shape, the height little more 

 than the width, and tapering rapidly towards apex; fourteen very 

 distinct and well-marked longitudinal ribs, extend from base to 

 apex, ending in a small depressed area at the summit around the apical 

 area; this area is somewhat flattened, and contains the median 

 micropylar rosette in its centre. Between the longitudinal ribs are a 

 number of fine transverse ribs (or striations) that do not appear to 

 cross the summits of the longitudinal ridges, which seem to be some- 

 what sharp-edged. The longitudinal ribs mostly anastomose in pairs 

 near the shoulder of the egg, and their apical terminations unite to 

 form a raised wall surrounding the micropylar area. [Described 

 August 10th, 1903, from an egg obtamed by dissecting a ? captured 

 at Arolla on August 9th.] 



Plebeiufi ari/yroiiumiion {aryua). — The egg is bright green in colour, 

 circular in outline, forming a flattened disc about one-half the height of 

 the diameter ; the surface appears to be covered with minute rough 

 points, closely set over the whole surface, and giving one the impres- 

 sion that the egg is thickly pitted. Medially at the apex is a minute 

 micropylar depression, the structure of which cannot be made out with 

 the power at disposal. [This note was made on August 10th, 1903, 

 from an egg obtained from a dissected ? taken at Arolla on August 

 8th, 1903.] 



