MALACOSOMA CASTRENSIS. 541 



the pale reddish-grey mouth-parts, and the surrounding shiny black 

 maxillte, maxillary palpi, legs, wings and thorax. It is rather more 

 than seven-eighths of an inch in length ; is widest (three-eighths of an 

 inch) at the 4th and 5th abdominal segments, narrowing rapidly to a 

 blunt point formed by the 9th and 10th abdominal segments. VentraMy: 

 The dorsal head-piece well-developed, but ventral ; the mouth-parts 

 are pale reddish-grey, with bright orange labial palpi (?); the maxillaa 

 short, the first pair of legs extending beyond the maxilla?, and the 

 second pair beyond the first ; these are shiny black in colour, and are 

 partly enclosed between the antenna?, which, however, terminate at 

 about two-thirds along the costa of the wing, measured from the base ; 

 the first pair of legs ends medially on the same level as the tips of the 

 antennae, the second pair extending some distance beyond the antennae. 

 The antenna ends in a point, is strongly ribbed longitudinally down its 

 centre, and closely segmented transversely. The wings are rounded at 

 the apices, are short compared with their width, with distinct neuration 

 extending to Poulton's line, which is well marked. The 4th, 5th, 6th 

 and 7th abdominal segments have each two marked scars (in the posi- 

 tion of the larval prolegs) ; these segments are also covered thickly with 

 short yellow and brown bristles. The genital organs are well marked, 

 a linear depression being placed medially on both the 8th and 9th 

 abdominal segments ; the anus is very prominent on the 10th 

 abdominal, and the cremaster forms a rounded flap which extends far 

 beyond the anus, posteriorly, and is thickly covered with red-brown 

 bristles. Dorsally : The prothorax is rounded frontally and covered 

 with short red-brown bristles ; the mesothorax is swollen, has a fine 

 raised, shiny, mediodorsal line, is sparingly sprinkled with red-brown 

 bristles, is dull blackish in colour (as is also the whole of the dorsum), 

 giving rise on either side to the forewings ; the metathorax is narrow 

 and ill-developed, even the sides whence the hindwings originate being 

 ill-developed, the latter disappearing at once beneath the forewings ; 

 the prothoracic spiracle forms a longitudinal slit, placed in the 

 segmental incision between the pro- and mesothorax, and in contact 

 with the antenna ; the 1st, 2nd and 3rd abdominal segments narrow, 

 but each increases in width from the 1st to the 6th, whilst those 

 following the 6th contract to the cremaster, which is long, blunt and 

 rounded ; all the abdominal segments are sprinkled with short stiff 

 bristles, and these hold a thick covering of loose larval hairs which 

 entirely cover the abdominal segments dorsally, and less so the sides 

 and venter. Laterally : The rounded front of the prothorax thickly 

 covered with brown bristles ; the glazed eye, very distinct, forming an 

 open lunule, extending from the mouth to the base of the antenna ; 

 the shoulder of the forewing swollen ; the spiracles on the 2nd, 3rd, 

 4th, 5 th, 6th and 7th abdominal segments consist of a raised, brown, 

 roughly oval lip, placed towards the middle of each segment ; the 

 segments are well drawn within each other, so that, although there is 

 free movement between abdominal segments 4-5, 5-6, 6-7, the inter- 

 segmental membrane is not visible. The most remarkable features of 

 the papa are : (1) The yellow appearance of the abdominal segments. 

 (2) The thick covering of loose red-brown (larval or cocoon) hairs over 

 the greater part of the pupa. (3) The narrowing of the abdominal 

 segments to a point. (4) The extension of the cremaster beyond the 

 anus [Description made on July 16th, 1897, from a pupa received 



