On two new species of Biston Leach. {AmiM- 

 dasys Tr.) from Amoorland. 



iN^icliolas Kusiiezo"w. 



(With 2 figures). 



Biston bloeckeri, n, sp. 



(Fig. 3-4). 



Expanse of maie 62 and 65 milliiu. 



Antennae of maie fulvous, bipectinated for two-tliirds length, 

 witli short stifl' branches; their extremities setiform. Palpi very 

 short, blackish-brown. Proboscis developed, 5 millhn. in length. 

 Frons smooth, blackish brown. Vertex, collar, and thorax white, 

 thickly clotlied with coarse scales. Middle of collar, extremities of 

 tegulae, and tufts on metathorax spotted with brown. Body very 

 robust. 



Upper part and sides of the Ist and 2nd somites of abdo- 

 men blackish-brown, the rest white, with indistinct brown points. 

 Thorax on the underside and fémurs covered with grayish-brown 

 hairs. Fore and middle tibiae gray, hind ones, just as ail the 

 tarsi, whitish, spotted and ringed with black; the Ist paii* of 

 spurs of hind tibiae near the extremity. 



