450 



species are nearly always yellow, or ochreous-brown, with distinct intra- and 

 extradiscal lines on the fore wings. They are very rarely white, as in Metro- 

 campa and certain species- of Tetrads and Eugonia. 



Larva and pupa. — The caterpillars are large and long, often mimicking 

 the twigs of the trees or shrubs on which they feed, sometimes ornamented 

 with tubercles; the head is sometimes very large, often with large tubercles 

 on each side, with from two to four pairs of abdominal feet. Chrysalides 

 large, conical at the tip, of various hues, often protected by a thin cocoon. 



The fact that genera so closely allied as Drepanodes and Eutrapela are 



placed separately in the families "Ennomidai" and "Urapteryda." by M. 



Guenee seems to me a proof that the groups are artificial ones and should be 



united. 



Synopsis of the Genera. 



A. Wings angular ; costafull: 



Wings with a very prominent median angle in both pairs; that ou the hind wiugs 



much rounded ; female antenna; pectinated Syperetis. 



Like Syperetis, but the female antennae simple, and the fore wings more deeply exca- 

 vated Plagodis. 



Species small, yellow ; male antennas simple ; wings angular Nematocampa. 



B. Wings entire ; not angulated : 



A slight sinus in hind wings; four costal brown spots Caulostoma. 



Hind wings with a deep sinus ; species deep yellow Angerona. 



Like Angerona, but with no sinus in the hind wings ; deep yellow Opisthograptie. 



C. Wings very angular ; falcate : 



Hind wings rounded ; female antennae pectinated ; yellow Hetervlocha. 



Male antennas pectinated : fore wings suddenly excavated below the falcate apex ; 



hind wings with a slight angle ; yellow Sicya. 



Like Sicya, but male antennas simple ; hind wings with a very prominent angle ; 



yellow Antepione. 



Fore wings less falcate than in Antepione; hind wiugs excavated below the acute 



apex Epione. 



D. Wings slightly angular; broad: 



Male antenna; well pectinated ; wings moderately angular ; brown, with a very 



broad median baud in the middle of the wing Anagoga. 



Fore wings falcate ; hind wings well angulated ; male antenna? subplumose ; pearly- 

 white Hetrocampa. 



Like Metrocampa, but male antennas more plumose; ochreous or whitish-ochreous. 17<mna. 



Fore wings bent, falcate ; hind wings rounded ; male antennas heavily pectinated. Apieia. 



Like the lower species of Endropia; wings entire; species deep reddish-brown; 



hind wings in part ochreous ; beneath ochreous Epirrantiiis. 



E. Fore wings usually falcate ; front of the head rather narrow : 



Fore wings usually falcate, and both wings entire, notched or serrate Endropia. 



Male antennas simple ; wings well scalloped, noctuid-like let Una. 



Fore wings falcate ; both wings serrate; hind tibia- not swollen; browuish-ochre- 



ous, with violet tints Selenia. 



