332 



tliink tb at thcre they serve for the dispersioii of tlie larvae by 

 the wind. In that case, however, they shüukl have been much 

 h:)nger, for these small vesicles with a radius of + 10 ^a, cannot 

 excercise any influence on the specific w^eight. Moreover, the hmg 

 setae are more suitable for this purpose. It is certainly remark- 

 able that these setae only occur in the first instar both on 

 Lijniantria dispar and on Lymantria monaclm. Their function is a 

 riddle to me; for the time being, ] identify these setae with the 

 glandular hairs which often occur in a first instar. Directly after 

 hatching, the liead is coloured black, the tubercuhi become 

 coloured later on. 



ïhe following tubercula are visible : 



Protltorax. Small /'. dorsalis with short setae, rather largo r. 

 sHhdormlis on which the setae mentioned sub. 2 are present 

 (tliis verruca is conneoted with the prc^ceding one by an indistinct 

 ))r()th()racic shiold); a far projecting t\ siq>rast/(jiiialix with which 

 V. jjroxfif/inalis is connected, r. hifradigmaJls^ r. hcmdis and one 

 i\ venfralis. 



Mesothorax and iiiefaf/iora.r. Very large r. dorsali-^, small e. 

 doysolafcralis^ large v. sHprcfsf/j/i/xdis^ a long drawn r. infra^itig- 

 y>w?//.s, r. propedidis^ v. hasa/is^ i\ rodi'fdis. 



Ahdomen 1. Very small o. dorsalis and an extraordinarily large 

 r. sNbdorsalis. The verruca over the stigma is divided into two 

 parts by a furrow. The front part is v. suprastignicdis, the back 

 part (\ poststigmalis ; v. infrastignndis is elongated, r. [^/^(dis 

 small, no v, pedalis. 



This pattern I have called type I h. 

 Segni. 2=1, but v. infrasfiginalis consists of two parts, one be- 

 hind the other. 



„ 3, 4, 5, 6 ^i:: 2, but v. basalis is absent. 



„ 7, 8, 9 = 2, but on 9 th(> verrucac are much liigher than 

 on the other segments. 



„ 10 is strongly reduced, the verrucae are not distinct. 



Instar //. Duration 12 days. Length S mm. The same as 

 instar /, but the jx-culiar setae have disappeared. The setae bear 



