DIMORPHA VERSICOLORA. 255 



marked central ring of points there. The position of the larval 

 prolegs is marked, and the sexual organs are distinct. The 

 abdominal spiracles are very distinct, and consist of a somewhat 

 linear slit, with a black raised rim surrounded at some little 

 distance by another double raised black line. The cremaster 

 forms a somewhat flattened horn-like projection bent downwards, 

 the tip provided with a few golden-brown hairs arising in the 

 hollows between the sharp points clothing the horn (Tutt). 

 $ . iin. — i'iin. long, '3m. wide at the broadest part; 2, 1*2111. — 

 1*3111. long, '35m. — *4in. wide. The anal armature is very long, 

 varying in length from r2mm. — 2'5mm. ; the pupal skin is deep 

 red-brown, darkest on the dorsal area, where it is nearly black, 

 paler on the wing-cases, with some slight differences in individual 

 examples ; the ventral outline is nearly straight, the dorsal curved, 

 the anterior end rather blunt ; the pupa tapers from the 7 th ab- 

 dominal to the anus, the 1st, 2nd and 3rd abdominal segments 

 small, the 4th large, twice as long as 3rd ; 5th and 6th are rather 

 larger, 7th considerably shorter, the 8th still less ; the 9th is a 

 mere slip, whilst the 10th is represented by the anus and the anal 

 armature (a long, curved, flattened, ventrally-hollowed projection) ; 

 sexual organs clear and distinct ; wing- and appendage-cases are 

 small and short in comparison with the abdominal segments ; no 

 trace of waist or marked constriction between abdomen and thorax ; 

 the wings extend to but little more than half the length of 4th ab- 

 dominal. A very slight slip of the hindwings shows beyond the fore- 

 wings to middle of 4th abdominal segment ; the 2nd pair of legs 

 show inside the wings and extend to end of 3rd abdominal ; tips 

 of antennas only reach to about level of the 3rd abdominal spiracle ; 

 the tips of 1st legs to same distance; the face above labrum is raised 

 into a triangular projection or small beak ; the glazed eye is small 

 just at base of antenna ; beneath face are two small angular pieces 

 (labrum), and between these and 1st legs two considerable-sized 

 pieces form the haustellum. The remainder of the mouthparts is 

 indistinguishable on account of the rugosities; there is no dorsal head- 

 piece, although a portion of the head is quite anterior. A fair-sized but 

 angular prothorax, a large mesothorax, but a small slip forms the 

 metathorax, which is only slightly larger than the 1st abdominal; the 

 movable incisions are between the 4th — 5th, 5th — 6th, and 6th — 7th 

 abdominal segments. The surface of the pupa is exceedingly rugose, 

 especially on antenna-, leg- and appendage-cases ; the antennae are 

 ridged across like the teeth of a file ; the dorsal area is also 

 conspicuously rough, while on the 5th abdominal and following 

 segments the rugosities rise into ridges of backward-pointing 

 pyramidal spines, especially prominent on the 7th abdominal ; there 

 are also spiny processes on the anal horn ; the roughness is also in- 

 creased into poorly-developed spines on the posterior ventral edge of ab- 

 dominal segments 4, 5, and 6; the spiracles are large and prominent 

 from the 2nd abdominal to the 7th ; on the 8th is a spiracular scar only ; 

 the active spiracles are large oval depressions, each with a central longi- 

 tudinal slit. In the pupa of this species no great, if any, difference exists 

 as regards the development of the g and $ antenna-cases. In that of 

 Aglia tau the superficial likeness due to roughness, colour, and shape 

 of the anal horn, is departed from widely in certain features, such as 



