112 Annals Entomological Society of America [Vol. Ill, 



Melalopimn'ae: Wiih dense secondar}' hair on epicrania, front, 

 adfrontals and body, also on the tubercles, but not obscuring the 

 primary hair; notch of labrum shallow, the setae i and ii not far out 

 of a straight line; anal legs moderately reduced. 



Example Melalopha apicalis. Figs. 70 and S3. 



Pyg.«rin.\e: Head without secondary hair; dense secondary 



hair on body, usually not obscuring the primary hair; epicranial setae 



/; three times as far apart as i; anal legs are rudimentary stemapods, 



with one or two retracted hooks, labrum small proportionately. 



Examples Datana ministra. Fig. 78. 

 D. integerrima. Fig. 7.3. 



Notodontinae: Without secondary hair except on prolegs; anal 

 legs well developed in one form or another (in the species studied fairly 

 normal), with hair about as on the other legs; epicranial setae ii very 

 high up; and little if any farther apart than i: anal dungforks not 

 developed. 



Labrum half as high as wide, cleft about half its height. Frontal 

 jnmctures close to sel;c. 



Examples Schizura concinna. Fig. 74. 

 S. badia. 

 S. unicornis. 



Labrum very high and deeply cleft; frontal punctures about trisecting 

 the space between the setae; anal legs rather more reduced. 

 E.xample Nadata gibbosa. 

 Labrum and Irontal punctures similar; anal legs very little reduced. 



Examj)le Lophodonta. 

 J-'rontal jiunctures close tn setae: anal legs a little longer and more 

 conical . 



E.xample Heterocampa guttivitta. Figs. SO to 82. 



Cekukixak: Anal legs modihed into stemapoda without hooks 

 and with a retractile lash, with many setae; no secondary hair except 

 on the stemapoda and prolegs; epicranial setae ii intermediate in 

 position; anal dung-forks strongly developed. Labrum moderately 

 notched. 



Example Cerura. I'^igs. 7.') and 77. 



Family Thy.\tiridae. 



Prolegs with a band of inner hooks, alternately of two lengths, and 

 with a few minute outer hooks; anal legs slightly reduced; vib present 

 but without other subprimarics; epicrania decidedly wider than high, 

 front small; adfrontals wide, with // low down, frontal punctures 

 close ; labrum with vi slightly up from margin, and very deeply notched. 

 Mentum rather short, but subrnenta nearly meet in the middle line. 



Head abyut a fourth wider than high; a slight huinji on segment AS; 

 body with a regular iiattern of marks. 

 Ivxample Habrosyne derasa. 



Head abcnit half wider than high; body entirely lacking any hump, 

 and entirely without marks, setae less distinct than in -Habrosyne. 

 Example Bombycia or. Fig. SS. 



Family Drepanidae. 

 Prolegs with a band of inner hooks, alternately of two lengths, and 

 with a short band of rtulimcntary outer hooks: no anal legs; a subpri- 



