44 Journal New York Entomological Society. [Voi. viil 



1 6. Ohlitcrafa is only a name, and the species, if species it be, is 

 not known beyond Stretch's description. As far as this description 

 goes, it suggests a qiiensclii with red wings ; but I do not know if such 

 a thing ever occurs. 



17. Nex'cidcnsis is one of the forms that inhabit the arid region 

 from southern California and Arizona, through Colorado and Nevada 

 to eastern Washington and Montana. You may have thought that the 

 eastern species were in some confusion, but they are quite plain in 

 comparison with the confusion that exists here. ^Vhether there are 

 half a dozen species, or only one, I am unable to say ; but I will treat 

 them as in the last revision, making four species. Nevadeiisis with its 

 forms incornipta and nevadensis is the most abundant. The veins are 

 unlined, Ixit the transverse maculation is fully present, four bands be- 

 side the W-mark. In one form the bands are rather narrow, in the 

 other (incorn/pfa) broad. A^evadcnsis has the thorax black. It looks 

 very distinct, and I have no intergrades ; but it occurs with the wings 

 of both the narrow and broad banded forms and scattered all over the 

 same regions. Besides Dr. Strecker has specimens with the black 

 thorax and without it, said to have been bred from the same brood. 

 Mr. Coquillett has had the larva of nevadensis (black thorax) in southern 

 California and tells me that it is black with a broken dull white dorsal 

 line ; the hair brown.* This is essentially the same as that of sitperha, 

 the next species. Nothing is known of the early stages of the forms 

 without the black thorax. 



18. Siiperba was separated from nevadensis as the secondaries 

 seemed redder. This character is not at all marked, and otherwise 



* Arctin nevadensis Grote. 

 Larva. Body black, with a purplish tinge, the portion below the spiracle lighter, 

 more grayish, a broken, dull white dorsal line ; warts light gray, hairs issuing from them 

 in spreading clusters, not concealing the ground color, mixed black and reddish or black 

 and yellowish, the red and yellow hairs most numerous in the middle of the dorsum and 

 low down on each side of the body and varying in color from a bright brick red to a 

 pale straw yellow ; spiracles yellowish brown, ringed with lilack ; head black, the 

 sulcus on top between the two lobes, usually the sides and lower margin of the cly- 

 peus, and a dot at the base of each antenna, yellow ; mouthparts marked with yel- 

 low anal and abdominal prolegs largely pale yellowish ; length, 36 mm. Found a great 

 many from half to nearly full grown feeding upon varous plants at Santa Monica, 

 Calif., March 14, 1891. Placed leaves of Alalva borealis in their cage, and they fed 

 greedily upon them. One moth issued July 29th ; at this date two were chrysalids and 

 ten were larvi-p. The remaining moths issued in August and September. 



D. W. Coquillett. 



