ON THE AFFINITY OF OUK WILD AND DOMESTIC SILKWOKMS. 



35 



runs a broad baud lined with blackish rims. The abdominal margin blackish 

 brown with two small white markings. Auteume brown, pectinated, its teeth are 

 shorter thau in the male, and its shaft greyish. 



Length of the body 20 mm. Expansion of wings 44 mm. (rig. 1, a). 



Male greenish brown, fore and hind wings brownish yellow. The two 

 brownish transverse bands, a discocellular mark and a dark brownish patch 

 bordering the indentation lying below the apex of the fore wing deeper in color 

 and much more distinct than in the female. The indentation deeper, the 

 markings of the hind wing more distinct, and the teeth of pectinated antenna; 

 longer than in the other sex. Length of the body 15 mm. Expansion of wings 

 39 mm. (fig. 1, b). 



The eggs are deposited in groups on the stems or branches of mulberry trees 

 They are oval, somewhat flattened, and of a light yellowish grey color. Their 

 longer and shorter axes are respectively 1.7 mm. and 1.5 mm. The lower surface 

 of eggs i.e. the one by which they are attached to mulberry trees, is flattened, 

 while the centre of the opposite surface is usually more or less depressed. 



Larva of the first stage (that is before the first moult) is about 5 mm. in 

 length and has a quite different aspect from that of the following stages ( fig. •'!). 



It has a large blackish head, while the body segments are light blackish. A 

 few segments which follow the head arc broader than the latter ; but the remain- 

 ing segments are gradually reduced in size towards the posterior end. The anterior 

 half of the 1st segment of the body is greyish white, and the 2nd, 4th, 6th, 7th 

 and 8th segments are decorated with greyish yellow symmetrical markings. Al- 

 though the remaining segments bear also similar symmetrical markings, these 

 are more or less indistinct. 



On the subdorsal lines of each segment of the body except the 11th, there 

 lies a pair of turbercles provided with a few blackish long hairs bearing short 

 fine prickles ; while the 11th bears only a single hair bearing turbercle. 



The supra- and infra-stigmatic as well as the basal lines of each segment 

 bear each a single tubercle, which bears also a few long hairs of the same nature 

 as those mentioned above. 



After the first moult, the larva becomes naked by losing all its long hairs, 

 and the color as well as the markings are entirely different from those of the 

 previous stage. 



