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Descriptions of New Species of Mexican Heterocera. 
By Wma. Scuaus, Jr. 
SUBFAMILY CTENUCHIN&. 
Idalus herois n. sp. 
Primaries deep yellow, crossed from about the middle of the costal margin to 
near the internal angle by a black band which is widest at either extremity, and on 
the outer costal portion the black extends along the margin to the apex; this trans- 
verse band is divided into a series of spots by the veins which are gray-white where- 
ever they cross the band ; it is also broadly bordered on its entire inner portion, and 
at either extremity of its outer portion with white. At the base of the primaries is a 
similarly marked transverse band, and also a few pink scales at the base of the inner 
margin. Fringes white. Secondaries white, having in the male the outer two-thirds 
of the wings powdered with pink scales, but in the female only the inner margin is so 
marked. Underneath whitish with the outer two-thirds of the costal margin on the 
primaries and two small spots at the end of the cell dull black. Head and thorax 
white, spotted with roseate-brown. Abdomen above carmine with a dorsal row of 
white spots in the female ; the anus and underside of the abdomen white. 
Expanse, 35 —45 mm. 
25's, 2 QQ. Coatepec. 
Famity ARCTIIDA. 
Arachnis perotensis n. sp. 
Male.— Primaries above white, crossed from the costal to the inner margin by 
numerous irregular brown-gray bands edged with black. Secondaries white, trans- 
parent, with a few large gray spots on the costal margin, and a few very small ones 
on the outer margin ; the inner margin thickly clothed with long red scales. Under- 
side the same as upper, slightly reddish along the costal margins. Body rather 
woolly. Head gray, frons white. Collar white with two large gray spots circled 
with black. Thorax gray streaked with black and white. Abdomen dull red above 
with a brown dorsal band, and a lateral row of small brown spots; underneath 
white. Legs mottled with gray. Expanse 38 mm. 
Female.— Primaries similar to the male. Secondaries dull red with three broken 
and irregular transverse bands of a dull gray margined with a darker shade of gray. 
Extreme outer margin also dull gray, and the fringes white or dull gray. The under- 
side the same as the upper. Head and thorax the same as in the male. Abdomen 
not so woolly as in the other sex ; above reddish, except the last three segments 
which are yellowish, and with a dorsal and a lateral row of dull gray spots; under- 
neath white. Expanse, 45 mm. 
16', 3 QQ. Cofre de Perote. Elevation, 10,000 feet. From 
pupz found under the bark of a species of Pine. 
The female bears a strong resemblance to Arachnis aulea Bd. 
Arachnis suffusa n. sp. 
Male.—Primaries white, crossed trom the costal to the inner margin by very ir- 
regular and broken bands of dark gray narrowly edged with black. Secondaries 
creamy white with a few black spots along the costal margin and two very small 
spots at the anal angle. Underside the same as the upper, with the costal margins 
