124 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



but separate. Palj)! large, long, asceuding, api)ressed to the front below; second joint long, 

 continuous, pilose beneath; third joint small, pointed, not very distinct from the second. 



Thorax with a conical well-marked median crest, which sends off a spur backward, and a 

 slight ridge on each side. Wings: Primaries oblong, more than one-lialf as broad as long; costa 

 convex to beyond the middle, thence ascending to the upturned apex, which is slightly pointed; 

 outer margin a little bent, entire, nearly straight over halfway down, thence regularly rounded to 

 the internal angle. Venation: No subcostal cell; the first three branches of the subcostal vein 

 turned abruptly up to the costa, and ending farther from the apex than in Gluphisia, Nadata, or 

 Datana. 



Hind wings broad, apex ronndetl, outer edge rounded, longer than the internal margin. 



Legs densely hairy; fore legs densely hairy to the ungues. Abdomen with a long spreading 

 tuft on the upper side of the end, reaching beyond the genitals. 



Coloration: The species usually whitish ocherous, with oblique, in part dislocated, transverse 

 lines, two of these usually forming a distinct large V-shaped nmrk ; a deep brown patch 

 extending from the vertex of the head between the antennte back to the top of the crest; the 

 outer line on the costa very distinct silvery white, more or less oblique and sometimes S-shaped; 

 beyond this mark is a subapical rust-red patch. 



The genus is readily identified by the broad front, the hairy eyes, the well-pectinated 

 antenna^ of bi>th sexes, the large palpi, and the unusually short and broad fore wings, which are 

 nt)t falcate at the apex; also by the well-marked dark brown median crest on the thorax, and by 

 the laterally tufted tip of the abdomen. 



E(i(i. — Hemispherical, moderately high, with irregular meridional swollen portions and the 

 surface ornamented with polygonal areas inclosed by slightly thickened walls. 



Larva. — Body rather long, slightly flattened, ornamented with bright, usually yellow, and 

 dark stripes, and usually with two twin dark dorsal tubercles on the first and eighth abdominal 

 segments, with numerous pale hairs. The tubercles (in apicnlis) obsolete, the body being smooth 

 but striped, as usual. In Stage I cylindrical, with fine hairs all tapering; with indications at the 

 end of the stage of lines and abdominal tubercles. 



Cocoon. — Thin, irregular in shape, spun between two leaves. 



Fit2)a. — I>ody unusually thick, and full and blunt at the end, with a slender cylindrical 

 cremastcr, ending in two broad stout upcurved flattened hooks, each bearing four to five long setie. 



Geographical distribution. — The species are common to the Atlantic and Pacific coasts and 

 the'iutcrvening region, covering the Appalachian, Austroriparian, and Campestrian subprovinces. 

 Whether any extends into the Mexican (Sonoran) is doubtful. The genus is representcil in 

 Europe and xVmerica by several species in each hemisphere, and does not occur in either Asia or 

 Africa, nor in the tropics. 



SYNOPSIS (.)F THE SPECIES AND VARIETIES. 



A. Lines iiuast.oniosiug; basal Hue ilisloeateil tjii cubical vciu, not toothed; white costal mark oblirnie or 



more nearly straight. 



Basal line forming a sharp angle ; nsually mouse colored /. ajiiciiUs 



Larger and paler than Eastern npicalis var. urniita 



Pale, almost sordid white var. asloriw 



Pale purplish ; arms of V sinuous var. bifiria 



Largest and jialest species; white costal mark oblique; apes of V forming a loop; no thoracic band. 



/. iii,oi)iiita. 



Smaller than iiicliisa: pale sulioeherous; second, third, and fourth lines much more sinuous than in 



aj)icalis or hicUisa; sub.-ipical patch pale ocherous; costal mark oblique, sinuous; brown thoracic band 



obscure /. slyiyoiia 



Costal mark more oblique and distinct than in sirUjosa; no thoracic band var. liicidenta 



Usually large; a white, nearly straight, costal mark; subapical patch ocherous /. iiicliisa 



Sm.all, dark mouse-color ; 8uba])ical patch rust-red v.ar. hn'ersa 



Small, pale ocherous; subapical patch ocherous var. piiUa 



White costal mark oblique; sulioeberous, iuuer arm of V firmer, less sinuous var. /()co.9« 



Near aplcatia, pale, linos subparallel, not anastomosing /. hntcei 



Unusually dark, costal mark obscun^ var. midliioina 



Smaller, basal line bent and curved ; subapical patch very obscure var. alctlie 



B. Lines not anastomosing; V very narrow ; white costal mark S-like /. ulhoniijma 



Paler subapical patcli brown var. spccijica 



