ROEBUCK :' VARIATION IN LEHMANNIA ARBORUM. 277 



These observations, combined with those of many English 

 naturalists in respect of the darkness of the individuals oi Lhnax 

 agrestis found in winter, tend to show that it is either lowness 

 of temperature or deficiency of light that brings about deepening 

 of colour. Additional observations bearing on these points 

 would be of value. 



Synopsis of Varieties. 

 a. Var. typus Less. & Poll. 



Cinereo-vioiacens, ci/iereo-cya/iescens vel bruuneus, sub- 

 unicolor, dorso zonula pallida mediana ; clypeo zonis nigns- 

 centibus duabiis. Carina brevis. (Less. & Poll, 1882). 

 Localities. — Piedmont and Lombardy (Less. & Poll). 



b. Var. nemorosa Baudon. 



Baudon, who originally described this variety, charact- 

 erized it thus : — 



' Griseo riifa, perfasciata in clypeo et in iitroque latere 

 carince.' 



He further described it as a form nearly resembling the 

 type, though less slender ; reddish grey mixed with brown, 

 with a scarcely indicated general bluish tint ; bands well 

 marked laterally on the shield, and two on each side of the 

 back ; that which follows the keel being of a deeper brown ; 

 the cariniform band the colour of ' cafe'-au-lait ' as far as the 

 caudal extremity ; whitish marks present, especially at the 

 belly ; the pulmonary orifice surrounded by a pale red 

 circle ; the jaw soft, larger than in the type of the species. 



Lessona & Pollonera in 1882 describe the form thus: — 



'• PrcBcedenti \i.e. forma typica\ similis, dorso zonis 

 nigrescentibiis longihidi?ialibus duabns, lateribus sape macitl- 

 atus. Carina brevis.^ 



Localities. — Forest of Hez, dep. de I'Oise (Baudon); 

 Bramepan, dep. des Basses-Pyrenees (De Folin et Berillon); 

 Piedmont and Lombardy (Less. & Poll). Not yet recorded 

 for Britain. 



