MEMOmS OF THE >fATIONAL ACADEMY OF SCIENCES. 105 



Pupa rather stout, head prominent, notched at the end; the surface rugose and very coarscly 

 punetuied, the pits being more or less continent, especially on the thorax. Oremaster wide at base^ 

 bearing a pair of double sharp .spines. 



I am at present iDclined to think that this grouj) may be the most generalized one of the 

 family, owing to the smooth and hairy larv:e, resembling those of the Xyctemeridce, Liparida-, etc. 



Datana Walker. 

 (PI. XXXIX, and PI. XL (ij;. 5. Venation.) 



riialana Drury, 111. Nat. Hist., ii, 17?;). 



Abbot and Smith, Lep. lus. Georgia, 1797. 

 rt/gwraf Harris, Cat. Ins. Ma.ss., ii. 73, 183.5. 

 Ptlasia? Westwood, Dniry's 111. Exot. Eut., ii. p. 27, 1837. 

 Dalana Walker, Cat. Lep. Ket. Br. Mus., v, p. 1000. 185.5. 

 Enmelopuna Fitch, 2d Kep. Nox. Ins. N. Y., p. 235, l.SSfi. 

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



Smith, List Lep. Bor. Amer., p. 30, ls;iL 



Kirby. Syn. Cat. Lep. Het., i, p. 612, 18112. 



Neum. and Dyar, Trans. Amer. E">t. .Soc, xxi, j). 197, June, 1891; .lourn. N. Y. Ent. .Soc, ii, pp. 112, 

 116, Sept., 1894. 



Moth. — Head not prominent, rather .sunken; front vertically oblong, narrower in 5 ; the 

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

 slightly produced beneath, and ciliated. Between the autenuse at base is a minute vertical 

 pointed tuft. Maxilhe al>out as long as the head, sometimes sei)arate, but usually united and 

 rolled up. Palpi short and stout, ascending, second and third Joints bent upw ard e\en with the 

 front: the scales on the second joint long, bushy, even with or passing beyond tlie 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 pointed 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 the apex, which is somewhat produced; 

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

 subcostal cell, otherwise much as in Nadata, but with the costal region wider toward the ai)ex. 



Leg.s with the femora and tibi;e densely hairy; the second pair of spurs on the hind tibire 

 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 larvae,, 

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

 darker brownish patch, 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 pale ocherous. 



The species are readily recognized by the simple ciliated antenuce, 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, tlie shaded thorax, with its raised tufts at the sides, 

 like the top of the twig at the break."' (Can. Ent., xx., p. 184, Sept., 1888.) 



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

 hnmjjs; usually with long, rather dense, ))ale hairs. Freshly hatched larva, head large; body with 

 long clavate glandular hairs of unequal length; with faint subdorsal and lateral strijies. 



Pupa. — Head prominent, projecting well beyond the body, and with two parallel dorsal ridges;, 

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



iieoijraphicdl (Jistribiitiou. — The species are confined to the Appalachian and j^ustroripariau 

 subprovinces, except one (or two) species on the Pacific Coast. One species, Datana iittegenima, 

 is said by Mr. Druce (Biol. Gentr, Amer., p. 215) to occur at Jalapa, Mexico, this being in the 

 tropical or subtropical belt. 



