38 DONALDSON BODINE. 



as far as I have been able to study them, and, unless it be among 

 some of the Geometrina, I believe it will be found to hold for all the 

 forms of our fauna. In order to serve for both filiform and pecti- 

 nate antenuic, the table has to be practically double. Many charac- 

 ters which would be practicable for separation of filiform antennae, 

 either become obliterated or are seen with such difficulty when the 

 forms become pectinate, that other separation characters must be 

 found. In many cases also, two forms may be very unlike in ap- 

 pearance and even in structure, but at the same time be very difficult 

 to distinguish by means of a descri])tion. The following table is 

 constructed for the classification of the antennre of males, but in 

 most cases it will serve for the females also. The characters used 

 are selected because they are what seemed the best recognition char- 

 acters and not because they best represent the most essential differ- 

 ences in structural features. 



THE FRENULUM-CONSERVERS. 



A. Hairs of second type absent, or hut little developed. 

 B. Antenna filiform. 

 C. Hairs of third type absent; or, if present, with no definite arrangement 

 D. Cones large and on many segments. 



E. Scape large, twice the diameter of pedicel. . .CYMATOPHORID^. 



EE. Scape small, but little larger than pedicel GEOMETRINA. 



DD. Cones small, and on few segments THYRIDID^. 



CC. Hairs of third type inserted regularly. 



D. In a single row along the distal and proximal edges of ventral expan- 

 sion GEOMETRINA. 



DD. In a semicircle opening veutrad (see Figs. 46 and 50). 



E. Ventral expansions shortening ventrad, not equal to the segment in 



length NOTODONTID^. 



EE. Ventral expansion not shortening ventrad, equal to the segment in 

 length, so as to ciiuse the end of the clavola to be recurved. 



SPHINGID^ 

 BB. Antenna pectinate. 

 C. Ventral ex])ansion of the segment very large, extending ventrad of the 



bases of the pectinations SPHINGID.^. 



CC. Ventral expansion not extending far ventrad of the bases of the pecti- 

 nation.s. 

 D. Single hair of second type near middle of dorsal aspect of pectinations 



of the cephalic side DREPANID.S3. 



DD. Without hair of second type as in D. 



E. Cones on ventral asjiect of shaft, not on pectinations. 



F. Pectinations on distill half of segment GEOMETRINA. 



FF. Pectinations on proximal half of segments DIOPTID.^. 



EE. Cones at apex of pectinations, or beginning a migration out upon 

 them. 



F. Clavola pectinate to distal end NOTODONTID^. 



FF. Clavola filiform at disUil end GEOMETRINA. 



