108 ZYG^NIDiE AND BOMBYCIDJl 



1 -HEMILEUCA NEVADENSIS. N. S. (Plate 4, fig. 10, 5 . ) 



S . — Head and appendages black. Prothorax pale rusty ; patagia 

 whitish and very hairy. Thorax and abdomen black, anal tuft bright 

 rust red. Beneath black. Legs black with some rusty hairs on the 

 femora. 



Wings black and pale yellowish, subdiaphanous. Anterior wings 

 very pale yellowish, with the costa edged with deep black ; the basal 

 third of the wing is also 'black, and the outer margin has a broad 

 dusky band, the nervules traversing it being deep black. The discal 

 lunule is transverse, long and narrow, surrounded by a blackish halo, 

 connected only with the black costal margin, being remote from the 

 black base of the wings. 



Secondaries also very pale yellowish, black at the base, with a dusky 

 margin on the outer limb, terminating at the anal angle, and not con- 

 nected with the black basal region. Discal spot dusky, small, with 

 whitish transverse centre. Fringes of all the wings deep black. When 

 the wings are expanded, the black basal portion forms a very even 

 equilateral triangle. Beneath as above. 



Expanse of wings, 2.50 inches. Length 0/ body. 0.95 inch. 



ZTa^^zM— Nevada, (Coll. Dr. Behr.) 



Described from two S taken on the wing at Dayton, Nevada, flying 

 in the day time round willows, in August. The insect was not uncom- 

 mon, but a number of other specimens taken at the same time were 

 unfortunately destroyed by accident. Both the specimens agree very 

 closely with the above description, and may be distinguished from H. 

 maia, its nearest ally, by the following characters : There is much more 

 pale coloring on all the wings. On the primaries the halo round the 

 discal spot is separated from the basal patch, and the outer marginal 

 black band is not more than half the width. This last character is true 

 also of the secondaries, while at the same time the black discal spot is 

 larger than in H. maia. Finally, the patagia are whitish instead of 

 black. Though apparently not rare in Nevada, this insect has not 

 been detected in California. 



