224 MEMOIKS OF THE NATIONAL ACADEMY OF SCIEN(3ES. 



Heterocampa maateo (Douljknlai,). 

 (PI. V, lig. 1 g; VII. tiK. I'l <?.) 



Lochmivm manteo Doiibleday, Entomologist, p. 58, Jau., 1841. 



Harris, liut. Coiiesp., p. 131, 186H. 

 JJelerocampn manlio Walk., Cat. Lep. Het. lirit. Mus., v, p. 1024, 1855. 



Tadaiia cinerasrens Walker, Cat., l.ep. llet. lir. Mus., v, p. il!)l, 18.55. (Fide Grote and Roh.). 

 Hiteroviimpa manteo Morris, Synopsis Lcp. N. Aiiier., p. 240, 18G2. 



Heterocampa auhalbicans Grote, I'roc. Ent. Soc. Pliil., iii, p. 336, Dec 1863, pi. 8, tig. 2 (a jjood figure); New 

 Check List X. Amor. Moths, p. 19, 1882. 

 Packard, Fifth Rep. V. S. Kiit. Conim.. p. 158, 1890. 

 Smith, List Lep. Bor. Amer., ]). 31, 18'J1. 

 Kirliy, Syn. Cat. Lep. Ilet. Br., i, p. 564, 1892. 

 Heterocampa manteo Neum. and Dyar, Trans. Anier. Eut. Soc, xxi, p. 20G, 1894; Jouru. K. Y. Enf. Soc, li, 

 p. 117, Sept., 1894. 



Larva. 

 (PI. XXIX, ligs. 2-10.) 



Doubledai/, Entomologist, p. 58, Jan., 1841. (I'ncolored tigure of mature larva, plate facing ]>. 60, fig. fi; 



pupa, fig. 7.) 

 Comstock (J. H.), Rep. U. S. Dept. Agr. for IXSd, pp. 259, 260, 1881. 

 nihil, V\H\x Rep. U. S. Ent. Comm., pp. 158, 159, 1890. 

 Packard, Fifth Rep. U. S. Ent. Comm., p. 1.58, 1890. 



Proc Host. Soc. Nat. Hist., xxiv, pp. 545-548, 1890. 



Moth. — Three $ , two 9 (and others seen). Uniformly pale ash-j^ra.V, with three wavy diffuse 

 darker liue.s cros.sing the fore wings, and a large, heavy, black discal mark, becoming in rubbed 

 specimens two twin black dots inclosed in a pale ash spot. (Two very fresh and distinctly 

 marked S from the United States National Museum u.sed in this description.) Male autenuiB 

 moderately well pectinated, but less so than in most of the s])ecics. Head and thorax light 

 ash-gray; thorax behind over the mesoscutum darker. Fore wings ash-gray, varying from pale, 

 almost whiti.sh, a.sli to a dtirkish ash, and crossed by four usually distinct, deeply scalloped, dark 

 lines, the scallops more or less tilled in with pale gray. At the very base of the wings a short line 

 composed of cue scallop, which is deflected on the cubital vein and passing out along the 

 internal vein becomes confluent with the second line. Tliis second line is double, consisting of 

 two i)arallel, four-scalloped, dark lines, which pass straight across tlie wing, ending the same 

 distance from the base both on the costa and internal edge. A large, very conspicuous, 

 transversely oblong, black discal si)ot, which in old rubbed specimens usually appears as two 

 thin l)lack dots inclosed in a jiale area, and which is diagnostic of the species. Extradiscal line 

 double, composed of about ten scallops; where it ends on the costa dislocated and set in from the 

 subcostal portion. A little more than halfway from this to the edge of the wing is a dark, 

 sharply zigzag, diffuse line. A marginal row of about seven distinct black dots. 



Hind wings dark mouse colored, with a faint, diffuse, whitish line, and a dusky patch on the 

 internal edge. 



Underside of the fore wings like the ui)per side of the hind wings, with the costal edge on 

 the outer third i)ale, with four dark spots. Hind wings .sordid whitish; outer edge dusky, like 

 tlie fore wings. Fringe pale gray, with the venular spots alternating with the more distinct 

 marginal dots. 



Hind legs very hairy, with two i)airs of tibial spurs nearly equal in size. 



Expan.se of wings, c5 40-4.") mm., 9 43 mm.; length of body, S L'1-23 mm., 9 20 mm. 



This is the most common species of the genus, being sometimes abundant enough to be 

 actually destructive to oaks in tlie Bouthern States. The speckles differs from the others of the 

 genus in the large, black, wide discal spot, in rubbed specimens represented by two black dots in 

 a pale field, in tlie uniformly pale ash color of tlie fore wings, and the four distinct, deeply and 

 numerously scalloi)ed lines. 



Ef/f/. — "About 0.8 mm. in diameter, hemispherical, shining; under high power, irregularly 

 hexagonally sculptured, the sculptures consisting of raised lines. Color of dried specimen a dull 

 pink." (UileyMS.) 



