of the Genus Lithocolletis. clix 



wings are almost of the colour of L. Spinolella, paler than in L. ulmi- 

 foliella. The basal line comes nearly out of the middle of the base, it 

 remains nearer the costa than the inner margin, is fine, hardly thicker 

 towards the end, and terminates in a blunt point at one third of the 

 length of the wing ; before the half of the wing are the first pair of 

 opposite spots, which run towards one another nearly in a right an- 

 gle, and end near the point of the basal streak ; the inner marginal 

 spot, which is the largest, lies nearest to the base. At the base of the 

 inner margin, nearly midway between the base and the first dorsal 

 spot, is a blunt, distinct, unmargined white triangle, from which a very 

 fine white dorsal line is produced towards the base. The second pair 

 of opposite spots are internally margined with brown, and certainly 

 more strongly than the first pair ; both spots are nearly of a size, nar- 

 row, and that on the inner margin has its apex directed more towards 

 the apex of the wing than that of the costal spot ; in the male there is 

 a dark shade between their apices, which sometimes also reaches to 

 the black scales of the apex of the wing. The third pair of spots are 

 unmargined and small. On the costa near the apex is a larger, trian- 

 gular, likewise unmargined, odd spot, to which the black scales are 

 annexed. These in the male are only in the form of a streak, in the 

 female, on the contrary, they assume the form of a larger spot. In the 

 female, the space between the first two opposite spots is greater, and 

 besides, the dorsal spot is the smaller of the two ; whereas in the 

 male, the costal spot is the smallest. 



At the apex of the wing is a distinct hinder-marginal line, but this 

 is lost at the anal angle ; cilia gray-yellow. On the under side all the 

 spots and hinder-marginal line show through. Posterior wings shin- 

 ing dark gray, the cilia somewhat lighter. Abdomen gray, with the 

 anus paler. 



Of this scarce species I bred three specimens (two males and one 

 female) from Salix caprea, from Eckerberg, together with L. Spino- 

 lella ; near Vogelsang, where the latter was so common, I have not 

 yet found it. The period of flight is unknown to me. 



Note. — Herr Dr. Wocke took this species in the Silesian moun- 

 tains, a proof that it is widely distributed, and occurs in very different 

 localities. 



11. L. cavella, Z. This scarce species, first detected by Herr Zel- 

 ler near Glogau, also frequents the birches with us, although very 

 scarce, and two miles from Stettin. Hitherto I have only found it on 

 young birches, near Falkenwald, in the autumn of 1849. From the 

 leaves of these trees, which grow in a very sandy place among fir- 



