73 



Mutncwhiit longer plumes, r. (loi'snlis becomes smaller. The pio- 

 thuracio shield has disappeared. 



Instar ///. Duration 8 days. Length 15 mm. As instar //. 



Instar I\\ Duration 6 days. Length 24 n>in. As instar //, the 

 sides of the head become grey. 



Instar V. Duration 11 days. Inrngth 35 mm. As instar // 

 but some secundary setae appear on the body and the v. in/ni- 

 stitjmalfs are sometimes divided into many pieces, on the thora- 

 cic segments the v. pedales are wanting. 

 Pupa. 



On the abdomen of the pupa the verrucae are arranged in a 

 distinct way according to type I b. The furrow between v. supm- 

 ^tiijmalis and r. i)Oststi(jinalis has grown larger. 



The setae on the pupa too are plumed. Distinct are : v. dorsatis 

 even larger than on the caterpillars, v. subdorsalis, v. suprastig- 

 omUs 4- V. poststig malts, r. infrastigmalis, v. basalis and a far 

 projecting r. pedalis, 



Euprodis (Porthesia) chrysorhoea Linn., Plate II, fig. 12 — 15. 



Material in alcohol, from Groningen (spring 1915) and living 

 material from the Hague (autumn 1914). 



I have not been able to obtain the newly hatched caterpillars 

 of this species. The youngest are of December 19th 1914. They 

 were found in a nest on Hippophaes rhamnoides Linn, and as 

 in the course of their development they cast the skin four times, 

 and were only 4 a 5 mm. long, I have described them as 

 instar I. 



Instar /. Duration at least 130 days, they hibernate/ The first 

 moulting took place on April 27th. Length 4 mm. Tubercula 

 formed like warts. 



The setae are not plumed, ± 1 mm. long. 



The colour pattern is very intricate, there is a distinct median 

 dorsal line. 



Prothorax. Both the v. dorsales from the left to the right are 

 connected by a distinct prothoracic shield. The v. subdorsales are 



