424 PROCEEDINGS OF THE THIRD ENTOMOLOGICAL MEETING 



the basal broad half of the vasiform orifice. The apex of the lingula 

 projects beyond the operculum and not reaching the apex of the vasi- 

 form orifice, unicolorous with the operculum. 



Nymph — 4th Instar. (Nymph as seen on the leaf, not treated with 

 K H.) In the 4th instar the distinction between the male and the 

 female nymphs becomes very distinct. Female nymphs are longer and 

 broader than male nymphs. The nymph immediately after moulting 

 is dull brown, quickly turning dark grey and ultimately shiny black 

 with two translucent spots on either side of the longitudinal median 

 ridge on the cephalo-thorax. A deep excavated line runs interiorly 

 round the margin. The exuvium remained attached to the nymph for 

 some time. 



The full-grown larva is 2-25 mm. long, I'O.j mm. broad exclusive 

 of the waxy fringe. Dorsum covered tliickly xaih cretaceous white 

 meal. Between the whitish dorsal meal and the marginal cretaceous 

 white fringe a deep black excavated line runs internally round the peri- 

 phery of the margin. A dorso-median longitudinal cretaceous white 

 line on the cephalo-thorax and the abdomen extending to the base of 

 the vasiform orifice, somewhat broken on the cephalo-thort.x anteri- 

 orly, prominent on the cephalo-thorax prominently and the abdomen 

 basally. 



Vasiform orifice long, in the shape of an elongate cone, apex pointing 

 caudad, basally and laterally bounded by cretaceous white fines, the 

 lateral ones meeting below apex of the vasiform orifice forming a thick 

 white fine which touches the marginal fringe. 



In the untreated specimens the operculum and the lingula are indis- 

 tinct on account of the black colour of the chitin. 



Life-cycle and Hibernation. 



During August 1913, a complete life-cycle was seen to occupy 24 to 

 25 days, thus : — 



Eggs laid ..... 9th August 1913. 



Eggs hatched .... 16th August 1913. 



Adults emerged . . . 3rd September 1913 . . 2.5 days. 



In the winter the cycle must be still longer. There is practically 

 no hibernation in this species during the winter. The adults are found 

 from November until the end of January and the beginning of February. 

 They seem to be very susceptible to hot winds during April-June. On 



