76 



tation of a great accuracy in the arrangement of the tubercula. On 

 examining it closely, however, one sees that on each segment a 

 verruca is left out. V. suprastigmalis was drawn excessively large 

 and thereby the v. in frastig males were placed too low, so that no 

 room was left for a v. basalts^ though the legs are plainly visible 

 from the side and it should therefore have been represented. 

 On the prothorax v. subdorsalis has not been drawn, though 

 in reality it is present, and the false impression is given that 

 V. dorsalis is as much developed as v. suprastigmalis. In fact 

 the latter projects a considerable distance from the body and the 

 former is visible as a median protuberance on the base of it. 



I have treated this case somewhat in detail, because it shows 

 that the confidence, which I originally placed in existing illustra- 

 tions, was misplaced. 



Dyar (1894) defines the Lymantridae with the following words: 



"Not more than one tuberculum on the third annulet and only 

 six above the base of the leg. 



"Not more than two tubercula on the middle annulet, and 

 generally one on the third; one prothoracal shield. 



"Tubercula IV and V {v. poststigmalis and v. infrastignialis) far 

 from each other or IV has disappeared. Tubercula with many 

 setae, no setae on the skin." 



Packard (1889, p. 55 — 59) gives the fullest description. 



As has already been observed, he describes only four stages, 

 whilst Buckler gives five; my investigation has also shown me 

 that there are five different instars. 



Packard gives as the most important results: 



Instar I. Duration 7 — 8 days. Length 4 mm., tubercula black, 

 the middle ones on the thoracal segments smaller than the lateral 

 ones. Setae thinly spinose, very long. The two glands on the 

 abdominal segments 6 and 7 not clear. 



Instar //. Duration 4 days. Length 6 — 8 mm. Tubercula black ; 

 except the two large lateral ones on the 1st thoracal segment 

 which are red at the base. The glands are coral-red. There is 

 a subdorsal line which is not quite complete. Towards the end 



