THE INSECTS OF MACQUARIE ISLAND—TILLYARD—BRUES—-LEA. 28 
line, the triordinal arrangement degenerates into a simpler arrangement, the largest 
hooks being absent, and the smallest ones somewhat irregularly developed here and 
there between the predominant middle-sized ones. (Text-fig. 15.) 
Chetotaxy.*—The outstanding characters of the chetotaxy are that there are 
no secondary or tufted setee developed, and each proleg only bears four sete, viz.. pt, 
nu, tau, and sigma, of which the last, lying on the inner side towards the middle line 
of the body, is not visible in Text-fig. 16a. The seta theta is absent on all except the 
meso- and meta-thorax. The kappa-group is represented by a single pinaculum bearing 
two setae, kappa and eta, on every segment from the prothorax to the eighth abdominal 
(Text-fig. 15a, b, 16a). The ninth abdominal segment has only a single seta (ela) 
on the pinaculum which is in line with the eighth abdominal spiracle, but the pmaculum 
situated above this carries two setee, rho and epsilon. 
Text-figs. 16 and 17 show the chetotaxy of the prothorax, the mesothorax, 
and the fifth and ninth abdominal segments. The combination of the form of the 
armature of the prolegs with the presence of kappa and efa on a single pinaculum on the 
Fig. 17,.—Cheetotaxy of the fifth (a) and ninth (2) abdominal segments of the caterpillar shown in Text-fig 13. sp., Spiracle 
of the fifth segment. F 
The Greek letters indicate the seti, the nomenclature being that of Fracker. The pinacula carrying the sete are shaded, 
(% 30.) 
prothorax, and with the presence of efa only on the corresponding pinaculum of 
segment 9, while theta is absent from all segments except the meso- and meta-thorax, 
marks this larva definitely as belonging to the Orambine. 
_ > * The nomenclature: for the sets adopted here is that of Fracker : “ The Classification of Lepidopterous Larve,’’ 
Illinois Biological Monographs, vol. II. No, 1, July, 1915. pp. 1-169, ten plates. 
