346 



visible. At aboiit the time of the first moulting the verrucac (/or- 

 sales of the abdominal segment 9 begin to stretch themselves, 

 and rise to the "caudal horn" whieh reminds iis somewhat of 

 that of the SpJiingidae. 



Protliorax. Voruca^ dorsalis large, with fonr or five setae ; seta 

 si(hdorsaliSj r. stq) ra stigmalis, not distinctly confined, but there 

 are three to six setae placed together; v. prostigmalis with three 

 setae, v. hasalis with three setae, s. propedalis, s. postpedalis, some 

 small setae on the leg, and s. ventralis. 



Mesothonix. V. dorsalis and v. dorsolaferalis large, each with 



five or six setae, s. suprastifjmaUs, r. prostigmalis with foiir setae, 



V. hasalis with four setae. S. propedalis, s. postpedalis, s. ventralis. 



Metathorax = mesothorax, but sometimes there is a median 



dorsal seta. 



Ahdomen 1,2. Here too this medial dorsal seta is sometimes found. 



V. dorsalis large with four setae, s. subdorsalis, v. Sïiprastig- 



malis large with four setae, s. poststigmalis, s. infrastigmalis, 



V. hasalis with four setae ; two or three s. {pro- et post) p)edales\ 



s. ventralis. 



Segin. 3, 4, 5, 6 = 1 and 2, but v. propedalis bears two setae, and 

 on the leg one finds at the front and the back edge two 

 pigmental spots with one or more small setae ; s. poststigmalis 

 bears very often two setae, but this is not a constant feature, 

 neither is it so on the successive segments of one individual. 

 „ 7, 8 = 1 and 2, but s. poststigmalis has often been doubled. 

 The newly-hatched larva directly bears a v. do)-salis on 

 segment 8, whieh is higher and larger than the other ver- 

 rucae. That it is a v. dorsalis appears from the s. suh- 

 dorsalis, placed behind it. The two r. dorsales of the right 

 and left sides are united. When the length of the Cater- 

 pillar is 4 mm. this verruca is 50 — 60 /-/.. higli. It soon 

 grows to the doublé height, whereas the length of the 

 Caterpillar increases only very little. 



When the Caterpillar is a fortnight old, it is about 6 mm. 

 long and the v. dorsales have already attained a height of 



