1864.] 425 



be yellow with black spots and markings on its body," which has since 

 turned out to be literally correct. ( Vallri/ Farmer, July 1862, p. 210 

 and Sept. 1864, p. 273.) Now my two larvae are quadrivittate with 

 sanguineous, and the imago of pethicida is of a uniform brownish 

 ochreous color, without any sanguineous or rosy -red markings. On the 

 other hand the only N. A. Dryocampa that are strongly marked in the 

 imago with sanguineous or rosy -red or dull purple are wiper ialis, ruhi- 

 cunda and huolor. Imperialis is out of the question, and we know 

 from Mr. Lintner's very full and precise description that my larva can- 

 not possibly be ruhicundn, whence by the method of exhaustion I infer 

 that it is probably hicolor. The fact that Harris describes the sup- 

 posed larva of pellucid a as '-shaded on the back and sides with red" 

 is another reason why we may conclude that his larva really belonged 

 to ruhicunda and not to pellucid a. It is very true that the specimens 

 from which Mr. Lintner drew his description were not thus shaded, but 

 just so some larvae of D. imperialis are " slightly tinged with red on 

 the back," and some are not. (Harris Inj. Ins. p. 404.) For the pre- 

 sence or non-presence of a mere shade is unimportant when compared 

 with the presence or non-presence of a stripe. 



In regard to the validity of my new genus Spliingicampa, which 

 differs from Dri/ocampa. much as Attacus differs from Saturnia, in the 

 9 antennae being basally feathered, though less widely so than the S an- 

 tennai, Mr. Grote inform§ me that Herrick Seh^effer has figured and 

 described a great number of South American Drj/ocampa which are 

 distinguished by the same peculiarity, but the larvae of which are at 

 present unknown. Hence it would seem that Sp)hingicampa is more 

 peculiarly a South American genus. Mr. Grote also informs me, that 

 the imago which I described with some doubt (pp. 298-9) as that of 

 Limacodes scapha Harris, is, to his personal knowledge, correctly re- 

 ferable to that species. 



Dryocampa bicolor? Harris. Larva. Length, when apparently, judging 

 from the size of tlie liead, it was just moulted, 1.20 inch. Head greenish yel- 

 low, with a brown-black spot bordering the eyes, which are 4 or 5 in number 

 on each side and arranged in a circle open behind; mouth a little varied with 

 brown-black. Bodi/ very pale greenish-brown, thickly covered and frosted 

 over with small, irregularly placed, whitish granules, none of which are trans- 

 versely arranged as they are in .s^i^'wa. A pair of dorsal sanguineous stripes, 

 and a lateral sanguineous stripe placed immediately below the line of the spi- 



