37 



NOTES ON THE SPECIES AND FORMS OF THE 

 GENUS DREPANA, SCHRANK 



Drepana arcuata, Wlk. 



1855, Wlk., Cat. Lep. Het. B. M., V., 1164, Drepana. 1862, Grt., Proc. Ac. 

 Nat. Sci. Phila., p. 59, fahula, Platypteryx. 



This is the common or normal form, with the median line almost 

 evenly dentate inwardly on the veins below the subreniform and 

 not conspicuously produced outward above vein 1. The subreniform 

 is small reduced to a mere point and does not make contact with the 

 median line. 



The European D. falcataria, L. closely approaches this form but 

 the t. p. line is more prominently shaded; the subreniform is larger, 

 over one millimeter in diameter and makes contact with the median 

 line, which is rather more irregular than in arcuata and has a prom- 

 inent projecting outward tooth above vein 1. The banding on the 

 secondaries is also more irregular. 



The type localities of arcuata and fahula are Nova Scotia and 

 New York, respectively. We have the form from Quebec, N. H., 

 Mass., N. Y. and Ind. 



Drepana arcuata form geniculata, Grt. 



1852, Grt., Proc. Ac. Nat. Sci. Phila., p. 59, Platypteryx. 



A darker yellow, less distinctly marked form than arcuata; often some- 

 what smaller in size; the subreniform with a tendency to be somewhat larger, 

 altho never more than about 1/3 mm. Type locality, N. Y. We have the form 

 from Quebec, Mass. and Ind. 



Drepana arcuata race siculifer. Pack. 



1872, Pack., Peab. Acad. Sci., IV, 87, Drepana. 



This appears to either be a valid race or a species distinct from arcuata. 

 The form is considerably larger than arcuata, measuring about 42 mm. as against 

 35 mm. for the average arcuata. The subreniform is conspicuous, nearly H nini- 

 in diameter; in this character being closer to the European falcataria; and the 

 course and character of the ordinary lines are somewhat different, and more 

 intense. Type locality, Calif. Our specimens are from B. C. only. 



