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Descriptions of New Species of Mexican Heterocera. 



By \^^M. ScHxVUs, Jr. 



Subfamily CTENUCHIN.E. 

 Idalus herois n. sp. 



Primaries deep yellow, crossed from about the middle of the costal mar;^'in 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 whicli are gray-white where- 

 ever they cross the band ; it is also broadly bordered on its entn-e 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 wiih the outer two-thirds of the costal margin on the 

 primaries and two small spots at the end of the cell dull lilack. Head and thorax 

 white, spotted with roseate-brown. Abdomen above carmine with a dorsal row of 

 white spots in the female ; the anus and undei side of the abdomen white. 

 Expanse, 35—45 mm. 

 2 d^cT, 299. Coatepec. 



Family ARCTIID^E. 

 Arachnis perotensis n. sp. 



Male. — Primarie-^ 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 biDvvn 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 tran-verse 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 njipei". 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. 



I (5^, 3 9 9- Cofre de Perote. Elevation, 10,000 feet. From 

 pupiie 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 from 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 



