250 GEORGE D. HULST. 



subfamilies are very closely related, and the absence of the frenulum 

 merely marks the completion of a tendency shown very distinctly 

 in the nearly allied genera of the Hydriominse, such as on the one 

 hand Lobophora, Trichopteryx, etc., and on the other Alsophila, 

 Paleacrita and Eudule. 



DYSPTERIDINiE. 



Synopsis of Genera. 



1. Antenna; of % bipectinate 1. Dyspteris. 



Antennae of % not bipectinate 2. 



2. Hind wings of 9 partly or not at all developed 3. 



Hind wings of 9 developed as in '^ 5- 



3. Hind wings of 9 obsolete 7. Rachela. 



Hind wings of 9 partly developed, about as long as thorax 4. 



4. Tongue present, though weak 5. ©pheroptera. 



Tongue obsolete 6. Pa ra ptera. 



5. Fore wings with one accessory cell 2. Cyst,«*opteryx. 



Fore wings with two accessory cells 6. 



6. Hind tibiae of % with hair pencil 3. Nyctobia. 



Hind tibiae of % without pencil 4. C'ladara. 



1. DYSPTERIS Hubn. 



Verz. 286, 1818. 



Type D. amata Cr. 



Palpi short ; clypeus not tufted ; antennae bijDectinate in % , sim- 

 ple in 9 ; thorax and abdomen untufted ; hind tibise with all spurs 

 in both sexes; fore wings broad, even, inner margin short, 12 veins, 

 11 on 10, with one accessory cell; hind wings 8 not anastomosing 

 with cell, but joined in both sexes with it by a cross-vein beyond 

 middle ; hind wings of % with vitreous spot along inner margin 

 near base; frenulum wanting; venation of I very much distorted, 

 the cell being very much shortened and drawn in, and veins 1, 2 and 

 8 obsolete. In 9 2 and 3 are present, 4 widely separate from 5, 6 

 and 7 stemmed. 



This genus has heretofore been catalogued with the "Greens" so- 

 called, but beyond question it has no affinities with them. 

 Species. — D. abortivaria H.-Sch. 



2. €YSTEOPTERYX n. gen. 

 Type riridata Grt. 



Palpi short, porrect, quite heavily scaled ; front flattened ; antennae 

 ciliate in both sexes ; fore tibiae unarmed ; hind tibiae with end pair 

 of spurs only, without hair pencil in S ; thorax and abdomen un- 

 tufted ; fore wings 12 veins, one accessory cell, 6 stemmed with 7; 



