SCIENTIFIC PAPERS 



OF 



WILLIAM ALEXANDER FORBES. 



1. LATE APPEARANCE OF CETONIA AURATA* Ent.M.M.xi. 



p. 208 (1875). 



AT p. 178, vol. x. of the * Entomologist's Monthly Magazine,' Mr. Scott 

 records the appearance of Cetonia aurata on the 15th October. I have 

 now to chronicle an even later date for that species, as I found a 

 specimen of it at ivy -bloom, in the daytime, on the 29th October last 

 year, in a garden at West Wickham. This specimen was unusually 

 small, but otherwise in an excellent condition, and seemed to have but 

 just entered into the imago state. 



[These exceptional appearances are no doubt due to the fact that the 

 Cetonia (like Lucanus cervus, and some other beetles) assumes the perfect 

 state late in the autumn, but remains ordinarily in the cocoon till the 

 following summer. Hence these abnormal specimens should rather be 

 regarded as " early," not '* late," their appearance being perhaps due to 

 sudden rise of temperature combined with individual precocity. EDS.] 



2. ARRESTED DEVELOPMENT IN TIMAECHA Ent.M.M *i. 



CORIARIA AND LAGRIA HIRTAj 



THE following instances of arrested development, causing a want of 

 symmetry in the legs of insects, are interesting, and seem to me to be 

 worth publishing, insomuch as, so far as I know, no similar instance 

 has been recorded. In a $ specimen of TimarcJia coriaria taken last 

 autumn in Switzerland, this want of development occurs in the right 

 middle leg, all the others being of normal size. The following are the 

 dimensions of the stunted right leg, and its normal fellow on the left 



* Ent. Month. Mag. xi. p. 208 (1875). t Ibid. xi. p. 279 (1875). 



B 



