402 



LEPIDOPTERA 



CHAP. 



iu both hemispheres, but these Insects do not occur in insular 

 faunas. In Britain we have two genera, Hcterogenea and Apoda 

 (better known as Limacodes x ), each with a single species. 



The early stages of these Insects are of great interest. The 

 eggs, so far as known, are peculiar fiat oval scales, of irregular 

 outline and transparent ; we have figured an example in Vol. V. 

 Fig. 83. The eggs of the same moth are said to vary much 

 in size, though the larvae that emerge from them differ little 



from one another in this respect. The 

 latter are peculiar, inasmuch as they 

 have no abdominal feet, and the 

 thoracic legs are but small ; hence the 

 caterpillars move in an imperceptible 

 gliding manner that has suggested for 

 some of them the name of slug-worms. 

 The metamorphoses of a few are 

 known. They may be 



A V- 



arranged in 



two groups ; one in which the larva 

 is spinose or armed with a series of 

 projections and appendages persisting 

 throughout life ; while in the members 

 of the second group the spines have 

 only a temporary existence. At the 

 moment the young larva of Apoda 

 testudo emerges from the egg it 



FIG. 200. Larva of Ajx>d<( tcxtndo ] lag nQ CO nspicuOUS SpillCS 01' processes, 

 just hatched. A, Dorsal view 



of larva ; B, C, D, a spine in and is an extremely soft, colourless 

 different states of evagination creature 2 but it a l most immediately 



All magnified. (After Chapman.) 



displays a remarkable system of com- 

 plex spines. These really exist in the larva when it is 

 hatched, and are thrust out from pits, as explained by 

 Dr. Chapman. In the succeeding stages, the spines become 

 modified in form, and the colour of the body and the nature of 



1 It is much to be, regretted that, as in so many other Lepidoptera, no satis- 

 factory agreement as to names has been attained'; -our British A. tcstudo is 

 variously styled Limacodes testudo (by Chapman and most naturalists), Apoda 

 liiiiKi-oifcn' C\<y Meyrick), or Apoda ai'cllana (Kirby, Catalogue of Motlis}. The 

 family is called either Limacodidae, Apodidae, Cochliopodidae, or Heterogeneidae. 



2 See Chapman, Tr. ait. Soc. London, 1894, p. 345, Plate VII., for our British 

 species ; for North American forms, Dyar, Life-histories of the New York Sluy-cater- 

 pillars (in progress, with numerous plates), J. Neiv York cut. Soc. iii. etc., 1895. 



