79 



Seym. 8=1. Two s. basalcs. 



^ 9. No V. dorsalis, r. subilorsalis and v. suprastigmalis very 

 large and strongly projecting, r. infnistiffmaUs about as 

 large as on 8, a wreath of s. hasales. 



J, 10. It is difficult to reduce the verrucae to the pattern of 

 the former segments. I consider the wart under the anal 

 opening as a r. infriisi'ujmalis. 



It seems to me that the two setae hasales of segni. 8 are pseudo- 

 primary ones. If the newly-hatched larvae are examined many 

 individuals with a well developed wart are found. Most parts do 

 not become coloured, but only the two extreme setae. I do not 

 think therefore that this case should be taken as a proof of the 

 thesis that warts have taken their origin from simple tubercula, 

 but I tliink we have to deal with the secondary dissolution of a 

 wart into simple setae. 



The two dorsal glands which are so obvious in the following 

 instar on the segments 6 and 7 are faintly visible. 



Instar II. Duration 10 days. Length 6 mm. 



All the setae are short-plumed, the side branches arise at irre- 

 gular distances. The form of most warts is about the same as of 

 those of instar /. The setae are not very different in length. 



Prothorax. V. dorsalis is small and is connected with that of 

 the other side by an indistinct prothoracic shield; a very small 

 r. sttbdorsalis which is remarkable in connection with the size it 

 possesses in instar 7, neither is it connected anymore with the pro- 

 thoracic shield. V. suprastigmalis is very large and projects con- 

 siderably. On it are the longest setae (2 mm., short feathered) 

 and between these are mostly five short ones, which are much 

 thicker and have longer plumes. It is an exception when they 

 are longer than '/^ mm. V. infrastigmalis is small and is no 

 longer so tall, v. basalis too is small. 



Mesothorax and Metathorax. We find the following small warts : 

 r. dorsalis, v. dorsolateralis, v. suprastigtnalis, v. infrastigmalis, 

 r. basalis. 



Abdomen 1. V. dorsalis is small, v.suhdorsalis very large with 



