COSMOTRICHE POTATORIA. 169 



6th separate, all shiny black, and therefore inconspicuous. The pro- 

 thorax is wider than mesothorax (each successive segment becoming 

 smaller) and bears, dorsally, two, very large, dark grey tubercles 

 (i + ii), which carry many minute shiny black points, each of which 

 gives off a red-brown hair ; a still larger lateral tubercle on either 

 side, bearing radiating hairs, some of which extend over face ; 

 each of these also carries two large pale hairs ; mesothorax and 

 metathorax with four similar tubercles, i and ii on either side ; these 

 are purplish-black in colour, and smaller than those of prothorax ; the 

 dorsum of the thoracic segments marked with yellow, which forms a 

 large conspicuous blotch on metathorax ; there is also a small 

 pale yellowish subdorsal spot on meso- and metathorax. Ab- 

 dominal segments gradually taper towards anus ; all tubercles large 

 and bear numerous hairs, i much larger than ii ; abdominal 

 segments i — 7 have i and ii purplish-black in colour, almost 

 united transversely, each bearing a number of bright-brown hairs ; 

 tubercle i is large, raised, hemispherical, bearing many shiny 

 black points, from each of which arises one long red-brown hair ; 

 ii similar to i, but smaller and placed on the orange space, and 

 almost directly behind i in position ; the purplish - black skin 

 forms a sort of mediodorsal line ; on either side of i is a small 

 yellow patch, and these yellow patches are separated longitudinally 

 by bright orange patches (in which ii is situated), so that these 

 look like orange subdorsal lines ■ a black oblique streak on each 

 segment, bordered on either side with yellow, meets each of these 

 yellow patches, and runs laterally across each segment"* ; tubercles 

 i are much swollen on the 8th and 9th abdominals, on these segments 

 forming a hump, whilst on the anal segment they are flatter and 

 occupy almost all the upper area ; on the 8th, ii bears only 1 hair ; 

 the 8th abdominal segment has, and the 9th has not, the bright 

 orange dorsal spot in which ii is placed. Laterally the spiracles 

 are practically hidden beneath the long hairs from the supra- 

 spiracular (iii) tubercles ; there is a slightly tumid subspiracular 

 longitudinal flange, situated just above the legs and extending from 

 the head to the 9th abdominal, yellowish in colour, more distinct on 

 thoracic than abdominal segments ; the lateral tubercles iii, iv, 

 and v are similar in appearance to the dorsal, purplish-grey with 

 black points, but iv and v give out white hairs ; these white 

 hairs curve ventrally, and almost meet the surface on which the 

 larva rests ; the hairs are mostly minutely spined. The true legs 

 are black, with a black terminal hook, thickly ringed with pale hairs 

 at joints ; the prolegs pale amber in colour, with dark points bearing 

 long pale hairs, the terminal joint (foot) bearing red-brown hooks, 

 almost transparent, an oblique whitish ring separating this joint 

 from the amber-coloured pedicel (Tutt. Described July 16th, 1896). 

 First instar (about to moult). The larva tapers considerably from 

 thorax to anus, both laterally and dorsally ; the effect of the 

 dorsal tapering is heightened by the body being more raised in 



* Bacot notes: "Either side bears 7 oblique double stripes, i.e., black 

 medially, with a yellow margin on each side. These slope from head to anus 

 (as in the larva of Dimorpha, and opposed to those of the larva of Smerinthus, in 

 which they slope from anus to head) ; the larval subsegments, too, are very 

 distinctly marked like those of Sphingid larvae" (i.L, July 14th, 1896). 



