147 



evidently impaired vitality, proved a serious obstacle, and I only 

 got the black varieties as far as the pupal state. I hope, however, 

 to continue my experiments at some future time with more 

 success. 



I have observed that the progeny of black males and black 

 females still have an atavistic tendency, but that the atavistic 

 forms do not seem to possess an equally high degree of vitality, 

 in fact they frequently refuse to reproduce their kind. The 

 grey forms are therefore liable to be exterminated in course of 

 time, and the great increase of black forms, within a com- 

 paratively short period, seems to indicate the way in which new 

 species are formed. A similar example appears to be aflforded 

 by another moth, Miana strigilis, with variety Aethiops, the 

 latter being almost black, and which at least in this district 

 comes to sugar in shoals, while the type is only seen in single 

 specimens and is almost rare. 



REPORT ON THE COLEOPTERA OBSERVED IN 

 CLEVELAND. 



By M. Lawson Thompson. 



1899. 

 In this Report it will be found that a number of additions 

 have been made in 1899 to the list of Beetles at present known 

 to inhabit Cleveland. Notes on the range of other and better 

 known species are included, making up the full record of work 

 during the year in this order of insects.* 



CoLEOPTERA. 



Carabus CatenulatuS, Scop,— On Castleton Moors in 

 September. 



Carabus nitens. L.— On Stanghow Moor in May. 



Bradycellus COgrnatuS, GylL— Common on the Moors at 

 Castleton in September. 



Calathus flavipes. Foure. - On the Moors at Castleton in 

 September. 



* I have followed the arrangement and nomenclature contained in 

 aiiarp and Fowler's Catalogue of British Coleoptera (1893). 



