120 ZYG^NIDiE AND BOMBVCID^ 



1 — LEPTARCTIA LENA. (PI. 5, figs. 3, 4, 5, 6, 11, 12, 13, 14, 16.) 

 Lithosia kna, Boisduval, Ann. Soc. Ent. Belg. vol. 12, p. 73 (1868-9). 

 Lithosia adnata, Boisduval, Ann. Soc. Ent. Belg. vol. 12, p 73 (1868-9). 



5 $ . — Head and its appendages brownish black. Patagia, thorax 

 and abdomen brownish black, the latter pale beneath and with a red- 

 dish lateral stripe. There is a narrow whitish line on the outside of 

 the prothorax, a narrow whitish line on the patagia, and a few whitish 

 scales on the vertex, sometimes more or less obsolete. Legs dusky, 

 inside of femora pinkish, inside of tibiae and tarsi yellowish. 



Anterior wings dusky brown, crossed by three very obscure, irregu- 

 lar darker lines, basal, median and submarginal, frequently scarcely 

 discernible. There is also a distinct whitish spot on the costa opposite 

 the discal vein, an outer smaller costal spot of the same color, one at 

 the anal angle, one on the inner margin, and a slender whitish streak 

 at the base of the wing beneath the median vein. Fringes concolorous 

 (see fig. 16). Sometimes a portion of the spots are obsolete (figs. 3 

 and 5) sometimes they are supplemented by a few smaller dots (fig. 

 11), without however greatly altering the appearance of the insect. 



Posterior wings yellow, with a broad marginal band of black spots, 

 sometimes distinctly isolated, sometimes partially fused (fig. 11), 

 sometimes completely fused into an unbroken band (figs. 3 and 5). 

 In some specimens there are traces of a blackish median band more 

 or less complete (fig. 11), the inner margin and base being also fre- 

 quently blackish, and from these specimens a regular gradation may 

 be found until there remains of the yellow color, only a narrow me- 

 dian band (fig. 13). This obliteration of the yellow by the encroach- 

 ment of the black, is confined chiefly to the 6 , the secondaries of the 

 $ being unusually largely yellow. 



Beneath, the primaries are yellowish, rather paler outwardly, dusky 

 along the inner margin and at the apex, the apical cloud enclosing a 

 small light costal spot. The secondaries usually are marked as above, 

 but somewhat paler in color. Sometimes all the wings are crossed by 

 a dark median band (fig. 14), sometimes the band is obsolete on the 

 secondaries (fig. 4), sometimes it appears only as spots on the prima- 

 ries (fig. 12), and frequently nothing remains except a dark spot on 

 the costa of each wing (fig. 6). The gradations between these forms 

 are innumerable, as scarcely any two specimens are exactly alike, and 

 I have examined upwards of sixiy. 



