44 On the indigenous Silhvorms of India. [Jan. 



Diagn. Pectinicornis, alis superioribus apice acutis subfalcatis, in 

 inferioribus subtriangularibus maculis duabus subcircularibus non 

 diaphanis luteis. Color lateritis — luteus, nebulis sparsis obscuris lineis 

 semicircularibus versus corpus duabus albis fascia albida brunnea 

 versus marginem inferiorem. 



Eggs, larva, and chrysalis, not seen living, but recognizable in the 

 accompanying drawing. (See Moonga moth, Plate VI.) 



Head, not projecting, with a tuft of reddish yellow hair. 



Eyes, ordinary dark-brown. 



Antenna, pectinated in $ , broader than usual in Saturnise. 



Palpi, four, covering the mouth which is invisible. 



Thorax, square, half oblong, clothed near the head in a silverish grey 

 color, forming a continuity of that in the upper margin of the superior 

 wings, the behind part of the color of the wings. 



Abdomen, more than two-thirds of the breadth of both wings in their 

 natural position, likewise of the color of the wings. • 



Legs, slender, hairy, yellow, short. 



Tarsi, slight and incurved. 



Wings, horizontally expanded, with a strong tendon directing the 

 membrane of the upper wings in their upper margin. 



Both pairs of a dark yellow somewhat reddish color. The end in 

 the male much curved, the upper margin half from the ^body, of a 

 silver grey color. The exterior extremity scarcely differently marked ; 

 a brown slightly undulated band, accompanied on both sides by a white 

 line, extends across the wings more than two-thirds below their 

 insertion on the thorax. Several brown nubeculse are to be observed 

 between the divisions of each tendon. Two semilunar white lines are 

 to be observed on the upper wings, and are absolutely on the lower 

 ones towards the abdomen ; the interior larger, inwards curved ; the 

 other shorter, outward bound. The two specks on the wings, peculiar 

 to Satumia, are almost semicircular, but not micaceous, diaphanous ; 

 but likewise clothed with yellow squamae of a darker line (more in $ ) 

 with a brown margin on the inner side. Through this distinguishing 

 peculiarity this insect seems to make a transit to a next genus, though 

 the drawing of the larva represents completely a saturnia caterpillar. 



The cocoon of a yellow brown color differs in appearance from all 

 the others. 



We are indebted for the discovery of this very interesting insect 

 to Captain Jenkins and Mr. Hugon. Its particulars are extensively 

 described in Mr. Hugon's memorandum. This • species has never 

 been mentioned before, though the fabrication of silk from it seems to 

 be very common amongst the Assamese. 



