STERRHOPTERIX HIRSUTELLA. 427 



roughly longitudinal dorsal lines, with one subdorsal, and one spiracular 

 on either side ; the four dorsal setae are placed in a straight line on the 

 anterior edge of mesothorax and metathorax ; the thoracic segments 

 separated by very wide and well- developed, dirty grey, intersegmental 

 membranes. The true legs are strong, corneous, coarsely reticulated, 

 dark outside, pale beneath, several coarse hairs just above the joints, 

 each bears a strong, brown, terminal claw. Abdomen: The abdominal 

 segments dirty greyish, very uniform in tint, the intersegmental 

 membranes well -developed. The 1st abdominal segment has a narrow, 

 median, transverse, corneous, dorsal plate (a mere remnant of those on 

 thoracic segments) , and the tuberclar setae are also provided with other 

 small corneous plates on this, as throughout the abdominal segments. 

 The seta? (i outside, and ii nearer mediodorsal line) are well-developed, 

 the prolegs carry an oval (broken on inner side) of hooks, and are 

 not well-developed ; the spiracles have a strongly developed oval rim 

 (Described from blown larva sent by Staudinger). Bacot notes that 

 " the median transverse plate on abdominal segment 1 is in line with 

 and between tubercles i, whilst in front of this again is a small circular 

 scar or corneous spot on either side of the median line. The median plate 

 is long, narrow, and doubtless formed of two independent plates united 

 on median line ; no hair-bases are traceable on these plates. On the 

 2nd abdominal this median plate is smaller, distinctly divided in the 

 median line, thus forming two separate plates ; whilst on the 3rd 

 abdominal they are still smaller and show a wider gap. Tubercle oi 

 is present, exceedingly minute, bears no hair, is placed quite on 

 anterior margin of abdominal segments 1-3, and in line in front of 

 i." Bruand writes .; " The body of a clear horn-colour with some 

 streaks, or rather black spots, arranged as in M. crassiorella but 

 in a more irregular manner, the subdorsal only is moderately indicated, 

 the other streaks are formed by the union of many small spots. The 

 head is black-brown, with some lines and spots of an intense yellow, 

 or very pale brown, disposed on each cheek as follows : First a line 

 slightly recurved, starting from the edge of the prothorax and 

 continuing almost for a third of the head, parallel to the median line 

 (i.e., to the line of intersection between the two cheeks) to which it is 

 quite close ; below this line is another, in the form of a V, of which the 

 point is directed towards the prothorax ; then, near the mandibles, 

 two spots, almost triangular, of which the lower is larger than the 

 upper. The true legs are brown, ringed with pale ; and under a lens 

 one distinguishes some very fine hairs on the body of the larva, as 

 also on the head and at the base of the true legs ; of these, the dorsal 

 are longer than the others." Bruand also notes a larva found on oak 

 which differed from those from sallow and aspen, the larva being 

 " much darker, so that the black-brown was predominant, the streaks 

 (very narrow othenvise) were pale, and the head, equally dark, scarcely 

 offered any trace of the lines and spots just described ; the true legs 

 were black, the claws reddish. The larva was ichneumoned." 



Pupa. — S • The living male pupa is red-brown in colour, darkening 

 to black before emergence. Surface shiny. Short, stout and stumpy ; 

 wing-cases extend to about the middle of the 4th abdominal segment ; 

 the third pair of legs slightly beyond this but not attached ; abdominal 

 segments 3 (dorsally), 4, 5, 6, and 7, free ; scars in position of larval 

 prolegs, fairly distinct ; anus very bluntly rounded, the cremaster 



