HARRISON G. DYAR. 15 



Palpi very short; hairs at base of thorax slightly tufted; venation as in Lo- 

 phodonta; antennae pectinated in both sexes, but the pectinations shorter in the 

 female. 



Type P. tremula Clerck (^ dictcea Esp.). The other species are 

 gnoina Fab. (= dictceoides Esp.), dlmidiata H.-S., portlandia Hy. 

 Edw., albifascia Moore, and probably also gigantea Elwes, moorei 

 Hainps., sikkima Moore and rufa Hanips. 



The larvje are smooth, shining, with a horn on the eighth ab- 

 dominal segment. 



Geuus OCHROSTIGMA Hubner. 

 1818.— Ochrostigmu Hiibner, Verz. bek. Schmett. 146. 

 WU.—Drynobia Dupont, Cat. Lep. Eur. 93. 

 Palpi short, wings broad, a large tooth on internal margin of primaries; tho- 

 racic tuftings rather distinct. Male antennae pectinated ; female simple. 



Type 0. velUaris Hnfn. Also 0. obliterata Esp. (— melagona 

 Borkh.). 



The larvpe resemble those of Lophodonta in general characters. 



Genus XOTODONTA Ochsenheimer. 

 1810. — Notodonta Ochsenheimer, Schmett. Eur. iii, 45. 

 1828.— Perirfert Stephens. 111. Brit. Eut. Haust. ii, 22. 

 1895. — Chatfeldin Grote, Abh. Natur. Vereins zu Bremen xiv, 7. 

 Palpi short, wings rather elongate, tuft on internal margin of primaries mod- 

 erate. Male antennae shortly pectinated ; female simple. 



Type N. dromedartus Linn. The other species are ziczac Linn., 

 phcebe Scriba (= torva Hiibn.), tritophus Esp., anceps Goeze (= tre- 

 pida Esp.) (type of Peiidea), basitriens Walk, (type of Chatfeldia) 

 and simplaria Graef. 



The larva of the type has humps on abdominal segments 1, 2, 3, 

 4 and 8, and is largely green ; tritophus has the humps on segments 

 1, 2, 3 and 8, and is whitish ; ziczac and phcebe have the humps on 

 segments 2, 3 and 8, and are purple-brown, while anceps is entirely 

 smooth, green, with white and red marks. 



Genus DKY.tlOIVIA Hiibner. 

 1818. — Drymonin Hiibner, Verz. bek. Schmett. 144. 

 1828.— C'/i«onm Stephens, 111. Brit. Ent. Haust. ii, 29. 

 Wings longer than in Notodonta, the tooth on internal margin of primaries 

 nearly obsolete — a tiny tuft of scales. Male antennae with longer pectinations 

 than in Notodonta; female simple. 



Type D. trimacula Esp. (= dodomea Hiibn.). The other species 

 are D. rvficornis Hufn. {^= chaonia Hiibn.), querna Fab. 



The larv?e are entirely smooth, green, with inconspicuous longitu- 

 dinal lines. 



TRANS. AM. ENT. SOC. XXIV. JANUARY, 1897. 



