406 BEITISH LEPIDOPTERA. 



boss than in the groove beneath, is the spiracle ; the next two ridges 

 are nearly parallel but tend to unite in front, the upper of these carries 

 a small corneous point with one hair (iv) except on the 4th abdominal, 

 where a second minute hair, v, is in front of it, the other segments 

 have only a point representing this second (v) hair ; the lower of the 

 two carries a corneous point towards the anterior extremity of the 

 segment, and on segments 3 and 4 this carries a hair (vi) ; there is 

 another hair, vii, at the base of the proleg. On the 8th abdominal 

 the trapezoidal tubercles are on a large plate. [Described June 3rd, 

 1899, from a larva sent by Mrs. Cowl.] Bacot describes the larva as 

 follows : Head small, rounded, partly retractile within prothorax, 

 black, mottled with whitish ; surface roughened with scattered hairs. 

 The thoracic segments of normal shape, the skin chitinous, nearly as 

 corneous as head, black, with dull yellowish mediodorsal, subdorsal, 

 and lateral longitudinal bands ; no subsegments apparent. The abdo- 

 minal segments larger, softer, gradually increasing in bulk to the 4th 

 abdominal then tapering to the 10th ; colour dull yellowish-white, 

 except the anal segment which is chitinous and brown ; segments 1-7 

 divided into two almost equal subsegments ; a broad raised lateral 

 longitudinal ridge on either side, the skin much wrinkled above and 

 below. The true legs are large, strong, and powerful ; the prolegs very 

 short with an incomplete oval of hooks ; centrally (within the hooks) 

 the foot is depressed, the bottom of depression yellow in colour. The 

 spiracles large, placed towards anterior edge of abdominal segments 

 1-7, but towards the posterior edge of 8 ; the thoracic spiracle is in 

 the pro-mesothoracic incision. The surface of the skin rather granular, 

 covered with minute chitinous plates or buttons ; all the tubercles 

 single-haired, the hairs or setas slender, pointed and simple ; on the 

 abdominal segments the dorsal and subdorsal tubercles have large 

 chitinous plates surrounding the bases of tubercles ; this character is 

 not noticeable on tubercles below spiracles, the plates (when present) 

 being small. These plates larger on abdominal segments 1-3 and get 

 gradually smaller to 7. On the 1st and 2nd abdominal segments are 

 additional plates, independent of the tubercles, and bearing no hairs. On 

 the prothorax are six tubercular setas on either side of median line, 

 arranged transversely along anterior edge of segment, a row of four 

 setae behind these and a single one on either side farther back vertically 

 above spiracle, those below spiracle are difficult to make out. On the 

 mesothorax, i and ii are in a transverse line near anterior edge of 

 segment, the inner smaller than outer ; a small iii (supraspiracular) , 

 iv and v subspiracular, close to each other, v larger (also a supple- 

 mentary one in a straight line in front of these), vi appears also to be 

 present ; on the metathorax the arrangement is the same, but iii is 

 lower down and larger. On the abdominal segments 1-7, i and ii are 

 trapezoidal, but ii nearer mediodorsal line than i, the latter is rather 

 stronger than the former ; iii is supraspiracular (in vertical line with 

 spiracle and i) , iv and v close together, below, but rather posterior to 

 the spiracles, v (anterior) much weaker than iv (posterior), both really 

 weak and without chitinous bases, and situated on lateral ridge ; below 

 iv and v is vi a larger tubercle and seta rather anterior to spiracle ; vii 

 is double at base of prolegs. The number and arrangement holds 

 good for segments 8, 9, and 10, but owing to the altered shape of the 

 segments the relative position is very different. Bacot notes also an 



