337 



of tliis stage tliere appcar somc ])luin(Hl setae on tho dorsal tuber- 

 cula of the 8th (abd.) segment and sometimes on tlie same tuber- 

 cula of the l«t and 2nd (abd.) segnionts. 



Instar III. Duration 5 days. Length 10 mm. The lateral tuber- 

 ciüa of the prothorax are of a pale Indian red, with black in between 

 and forni a pencil of plume-like setae which grow thicker towards 

 the end and which are as well developed proportionally as those 

 of the full-fed larva. 



The four median dorsal tufts are well developed, the two front 

 ones are deep brown, the two back ones are white. The 8th (abd.) 

 segment also has a long pencil of plume-like setae. All the 

 lateral tubercula are of a bright flesh-coloured red. With some 

 the colour of the dorsal tufts changes. 



Instar IV (= last). Duration 7 — -14 days. Length 17 — ? mm. 

 The cT ones sooner develop into pupae than the Q. The dorsal 

 tufts become pale buff-yellow. The tubercula are of a bright 

 coral-red, except the dorsal ones of the segments 2 and 3 which 

 are of a bright yellow. 



The data which Packard gives make it appear that this larva 

 only possesses four instars in America. The report of the 2iid moult 

 on May 22nd (p. 55) is probably due to a mistake, apparently 

 the Ist moult is meant, as the hatching took place on May 15tli. 



Orgyia antiqua Linn. Plate XII, fig. 1 — 6. 



Material in alcohol from June till August 1915 and of in- 

 star J, II and III also of June 1914. Collected at the Hague 

 and Groningen. 



Instar /. Duration 6 days. Length 3 ram. At the hatching the 

 head is black, the tubercula are light grey, they get coloured 

 half an hour later and become black. 



The colour-pattern is very intricate, but the colours are not 

 proof against the influence of alcohol. This is also the case 

 during the foUowing stages, so that I do not mention them here. 



See Packard (1889, p. 55—59). 



The V. stibdorsales are triangular and the setae which are fixed 



