PEMPELIA FORMOSA. 275 



a similar one along the spiracular region ; there thus 

 being five of these grey lines on each side. The 

 spiracles are imperceptible. The ventral surface is 

 uniformly dark green, powdered, especially at the 

 segmental divisions, with whitish. (George T. Porritt, 

 4th June, 1879; Entom., August, 1879, XII, 206.) 



Pempelia hostilts. 

 Plate CLIX, fig. 5. 



On the 23rd of September, 1879, Dr. J. H. Wood 

 kindly sent me two larvse of Pempelia hostilis, each 

 between two leaves of Popiilus tremula, spun together 

 with silk, to which quantities of frass were adhering. 



One larva was full-grown, the other quite small and 

 preparing to moult, three-eighths of an inch in length 

 and very slender, with blackish head and collar plates, 

 light pinkish-drab body with dorsal stripe just a tint 

 darker, and having on either side of the back two 

 cream-coloured lines, and along the spiracular region 

 two paler cream-coloured stripes, the lowest slanting 

 downwards just at the end of each segment through- 

 out its course, the ground colour between these and 

 also of the belly paler than that of the back and sides. 

 After moulting on the 26th it assumed the colour of 

 the full-grown example, though it refused to feed, and 

 in the course of a day or two a parasitic larva ate its 

 way out, which proved fatal to the unlucky victim, 

 whose shrivelled-up skin alone remained. 



The full-grown larva measures nearly three-quarters 

 of an inch in length, and is of moderate slenderness ; 

 the head is broad and full, about as wide as the second 

 segment, the body tapering behind from the tenth to 

 the end of the thirteenth ; the thoracic segments are 

 deeply wrinkled, the others with a deep transverse 

 wrinkle a little beyond the middle ; the ventral and 

 anal legs are short and much beneath the body ; the 

 rather shining head is blackish-brown, having a broad 



