120 BRITISH LEPIDOPTERA. 



forms agreeing best with the resting-places is evident, but that there 

 is any selection of particular resting-places by individual moths does 

 not appear to be at all likely, although Bacot believes unconscious 

 selection of a resting-place to be very possible. Stichel says that the 

 variation of the insects and their resting-places corresponds in such a 

 manner that the chance ot any moth resting accidentally on a 

 spot where it will not readily be seen is very great. 



Of the Eutrichids, Schultz recorded (Illus. Woch. fur Entomologie, 

 ii., p. 494) no fewer than 48 gynandromorphous examples belonging 

 to 9 species, viz., Macrothylacia rubi 1 specimen, Cosmotriche potatoria 

 9 specimens, C. albomaculata 1, Eu trie ha quercifolia 2, E. populifolia 

 1, Gastropacha ilicifolia 1, G. tremulifolia 1, Dendrolimus pini 28, D. 

 undans (fasciatella) ab. excellens 4. He later added {Joe. cit., iii., p. 

 311) 14 further examples, viz., Macrothylacia rubi 1, Dendi'olimus 

 pini 2, D. undans, ab. excellens 10, Eutricha populifolia var. obscura 

 (aestiva) 1. Most of these records were obtained from comparatively 

 few sources and collections, and no doubt could easily be multiplied 

 if lepidopterists had any idea of their scientific value. 



No experiments have been tried, to our knowledge, in hybrid- 

 ising the allied species of this group. We have already noted 

 (anted) that Durrant observed a pairing between Lasiocampa querais 

 S and Cosmotriche potatoria $ , and Loffier obtained a pairing 

 between E)endrolinius pini $ and a Lymantria monacha $ , at 

 Grunewald, near Berlin (Berlin. Ent. Zeits., 1888, p. 24), both pairings 

 that one could scarcely expect to be fruitful. 



Supposed cases of parthenogenesis in the Eutrichids have been 

 recorded {vide, anted, vol. i., p. 29), the species noted being Eutricha 

 quercifolia, Dendrolimus pini, and Cosmotriche potatoria, as well as 

 Macrothylacia rubi t post., p. 123), but many careful observations in 

 this direction are still required. 



Many of the Eutrichid imagines follow those of the Malacosomas 

 in the manner in which they are attracted to light, and, like them, 

 some of the species are only attracted in the male sex. Thus 

 males of Cosmotriche potatoria fly to the light in great numbers on 

 Wicken Fen and elsewhere on suitable nights, though scarcely 

 a female is ever attracted. Schultz observes (Berl. Ent. Zeits., liv., 

 p. 9) that, in Berlin, in some years, countless numbers of Dendrolimus 

 pini are attracted to the street lamps, and fall down on 

 the pavement, where they are crushed by carriages and pedestrians, 

 in some places leaving behind "spots" of grease several feet in 

 diameter. It is a remarkable fact that Eutricha quercifolia, also 

 attracted in large numbers by light, is so attracted in both sexes. 



Subfam. : Metanastriin^e. 



We have already suggested (an fed, p. in) that the subfamily 

 Mefanastriinae is divisible into at least three tribes — Macrothylaciidi, 

 G love riidi, and Metanastriidi — of which the first-named seems to be the 

 most specialised, and the last-named much the most generalised, a 

 wider gap existing between the second and third than between the 

 first and second tribes. Nor do we wish to suggest that these are 

 the only tribes to be included in this subfamily; on the other hand, 

 many species, that have not yet been sufficiently studied to lead 

 one to assert with certainty that they belong to separate tribes, 



