356 



then the Caterpillar acquires secondary setae which are so short 

 and homogeneous that it seems to be naked. 



Sinerinthiis fUiae. 



Material in alcohol. July 1915. Plate XIII, Fig. 2a, h. 



Instar I. Length 3 mm. 



The head is very large. Besides the tubercula described below, 

 the whole body and the caudal horn too, are cavered with irre- 

 gularly placed small setae, the length of which is + 50 [j.. Witli 

 a low power it looks as if they are bifurcated at the end as has 

 been figured by Sharp (II, p. 359) for instar I of Euchloe carda- 

 mines and by Packard (1905) for that of Ceteronna armjntor. 

 Ilighly magnified they appear to consist of a couple of bigger 

 rays and a number of thinner ones, all protuding from the 

 upper part of the seta. The whole thing might be compared 

 with an umbrella turned upside down of which some of the ribs 

 are thicker tlian the other. Plate IV, fig. 2a. 



The primary tubercula are not black in reality : the black in 

 the figure is only intended to draw attention to them. 



Prothorax. There are 8. dorsalis, s. suhdoisaUs, s. suprastignialis 

 or s. dorsolateralis, as it stands a little lower than one might expect 

 at first sight, *;. prosfif/nialis and s. infrastigmalis, two 6\ basales 

 placed next to each other, some smaller 8. pedales. 



MesotJiorax and Metaihorax. S. dorsalis, s. siqjrastigmaUs or 

 .s'. dorsolaterali», s. prostigmalis, two 8. basales, a few smaller 

 .s'. pedales. 



Abdomen 1. S. dorsalis, s. subdorsalis, s. suprasfigmalis, s.pro- 

 stigmalis, s. infrastiginalis, two s. basales, one of which agrees 

 with s. pedalis. 

 Segm. 2 = 1. One s. basalis. 



„ 3, 4, 5, 6. 7 = 2 i. e. one s. basalis and one s. pedalis. 



„ 8. We must consider the caudal horn as in the case of 

 Sj)h'inx ligustri. The skin is continued in unaltered con- 

 dition over the horn and bears the same umbrella-shaped 

 setae, for the rost as with 2. 



