MEMOIES OF THE NATI02TAL ACADEMY OF SCIENCES. 105 



Pui^a rather stout, head prominent, notched at the end; the surface rugose and very coarsely 

 punctured, the pits being- more or less confluent, especially on tlie tliorax. Cremaster wide at base, 

 bearing a pair of double sharp spines. 



I am at present inclined to think that this group may be the most generalized one of the 

 family, owing to the smooth and hairy larva% resembling those of the Nyctemerida.', Liparida', etc. 



Datana Wallier. 



(PI. XXXIX, iiud PI. XL fig. 5. Venatiou.) 



rttalaiia Drnry, III. N.it. Hist., ii, 1773. 



Abbot ami Smith, Lep. Iu.s. Georgia, 1797. 

 Fijga-raf Harris, Cat. Ins. Mass., p. 73, 1835. 

 Petasiaf Westwooil, Drury's III. Exot. Eut., ii, p. 27, 1837. 

 Datana Walker, Cat. Lep. Het. Br. Mas., v, p. 1060, 1855. 

 Eumetopona Fitch, 2il Rep. Nox. lus. N. Y., p. 235, 1851). 

 Dalaita Grote, New Check List N. Amer. Moths., p. 18, 1S82. 



Smith, List Lep. Bor. Amer., p. 30, 1891. 



Kirby, Syu. Cat. Lep. Het., i, p. 612, 1892. 



Neum. and Dyar, Trans. Amer. E-^t. Soc, xxi, p. 197, .Tune, 1894; .lonrn. N. Y. Ent. Soc. ii, pp. 112, 

 116, Sept., 1894. 



Motli. — Head imt prominent, rather sunken; front vertically oblong, narrower in 9 ; the 

 scales clothing it short, closely, and evenly cut. Antennae not pectinated in S , the joints only 

 sliglitly produced beneath, and ciliated. Between the antenna' at base is a minute vertical 

 pointed tuft. JIaxilla' about as long as the head, sometimes separate, but usually united and 

 rolled up. Palpi short and stout, ascending, second and third joints bent upward even with tlie 

 front; the scales on the second joint long, bushy, even with or passing beyond the end of the 

 minute third joint. 



Thorax rather large, pilose, convex, not tufted. Fore wings one-half as long as broad, 

 triangular; costa straight, becoming curved at the apex, which is ])ointed and slightly falcate; 

 outer edge slightly scalloped and in S very slightly excavated just below the apex. Hind wings 

 with the costal edge convex and bent down toward tlie apex, which is somewhat ijroduced; 

 outer edge slightly bent on the second median venule. Venation: A narrow subrhomboidal 

 subcostal cell, otherwise much as in Xadata, but with the costal region wider toward the apex. 



Legs with the femora and tibiae densely hairy; the second pair of spurs on the hind tibise 

 longer than the first; tarsi rather thick. Abdomen long, somewhat flattened in S , with a slight 

 tuft at the end; claspers large, long, and well developed. 



Coloration usually very uniform, the species closely resembling each other, as do the larva', 

 but differing somewhat in the venation of the fore wings; body and wings ocherous, thorax with a 

 darker brownish patcli, which is contracted and square behind; fore wings usually ocherous, 

 reddish brown, with a regular curved basal whitish brown line, and three parallel more or less 

 straight outer lines, with one or two discal dots; hind wings and body ])ale ocherous. 



The species are readily recognized by the simple ciliated antenna', short palpi, and the 

 peculiar mode of coloration. 



As regards the protective mimicry exhibited in these moths when at rest, Grote remarks that 

 Datana in repose '-looks like a broken twig, the shaded thorax, with its raised tufts at the sides, 

 like the top of the twig at the break."' (Can. Ent., xx., p. 184, Sept., 18SS.) 



Larva.— Body cylindrical, brightly banded, of uniform thickness, and with no tubercles or 

 humps; usually with long, rather dense, pale hairs. Freshly hatched larva, head large; body with 

 long clavate glandular hairs of unequal leugth; with faint subdorsal and lateral stripes. 



/•„jK(.— Head prominent, projecting well beyond the body, and witli two parallel dorsal ridges; 

 the surface of the body quite rough, being corrugated and granulated. 



(ico<iraphkul (Jisirihulion.— The species are confined to the Appalachian and J ustroripariau 

 .subi)roviiices, except one (or two) species on the Pacific Coast. One species, Datana integerrima, 

 is said by Mr. Druce (Biol. Ceiitr. Amer., p. 2451 to occur at Jalapa, Mexico, this being in the 

 tropical or subtropical belt. 



