Ercbia palarica and Ercbia stygne. 23 



and four or five times their length. Below is a tubercle with one 

 very short clubbed hair. This is as much below spiracle as the 

 double one is above it. Thoracic 2nd and 3rd have I. and II. single 

 and in the same transverse line as is III. which is however double, 

 it is exactly in line with III. abdominal. Below and quite to front 

 of segment, is a single tubercle. This is below line of spiracle but 

 above IV. and V. Lower is a single tubercle at base of leg (on pro- 

 thorax two). Prolegs have six hooks in single line, claspers eight. 

 The terminal bristle of the antenna rather long, three times the rest 

 of the antenna, or nearly so. The bristles are rather longer than 

 elsewhere, round the mouth region. The hairs of tubercles are very 

 small, curved backwards and slightly clubbed, transparent, and with 

 a roughened surface, in length, perhaps O06 mm. 



The following are Mr. Powell's notes. 



"Erebia stygne. 

 " Ova received from Dr. Chapman, July 21st, 1904. 



" The eggs are fixed to blades of grass. 



" Shape. Oval, with a flattened base concave in the centre. The 

 top is only slightly flattened. 



" Appearance. Pearly with a pinkish tinge, blotched with reddish- 

 grey. Vertical ribbing quite distinct under hand-lens. Height, 

 1*2 mm. Greatest width, -9 to 1 mm. 



" Under Microscope x 50. There are 21 (sometimes 22) vertical ribs 

 running from the edge of the base to the top, where they become 

 rather lumpy and broken, dying out on the nearly smooth area 

 around the micropyle. They are blunt-edged, with gently sloping 

 sides. The cross ribs are numerous, and of course very much 

 smaller and lower than the others. They constitute the long sides of 

 cells, the tops of the vertical ribs forming the short sides. On the 

 top of the egg the cells are large and irregular in shape, triangular, 

 lozenge-shaped, etc. They diminish very much in size as they near 

 the centre, in which is the invisible micropyle. There is no depres- 

 sion at the top, but in a few specimens the centre is occupied by a 

 low, roughened pimple formed by a bunching-up of the lumpy ends 

 of the ribs. The blotches observed under the hand-lens are seen to 

 be composed of pinkish or chocolate-coloured specks arranged in 

 loose groups. 



"These groups are beneath the eggshell. That they 

 are directly connected with the living contents of the egg 



