Scudder.] 306 [April 27, 



the narrowed portion being bent slightly downward, curving strongly- 

 inward and armed with minute denticles. 

 Florida. 



We close with the following statements concerning the synonymy 

 of the species: N. Ennius nob. is the northern representative of N. 

 Juvenalis Westw., and has generally been taken for that species. 

 N. Lucilius Lintn. and N. Icelus Lintn. have hitherto been con- 

 founded with N. Persius Scudd. and N. Brizo Westw., but separated 

 from the same by Mr. J. A. Lintner in a paper shortly to be pub- 

 lished. N. costalis Westw. is probably N. Juvenalis Westw. , though 

 possibly N. Ennius nob., or even N. Virgilius nob. ; it can hardly 

 be satisfactorily determined without an examination of the type. 

 Either N. Propertius nob. or N. Tibullus nob. may be the Cali- 

 fornian species which Boisduval, in his Lepidopteres de la Californie, 

 has considered to be N. Juvenalis Westw. N. Tages var. Cervantes 

 of Boisduval, in the same paper, is an undescribed species which we 

 did not obtain in season to include in this essay. We have seen no 

 Californian species which could possibly be referred to N. Brizo of 

 Boisduval, Lepidopteres de la Californie. We doubt whether N. 

 Lherminieri Westw. can be included in this group ; and N. Catullus 

 Westw. is certainly the representative of a distinct genus. 



Explanation of the Plate illustrating Asymmetry in the genital armor of Insects. 

 The lettering on all the figures is the same. 

 U. Side view of the upper organ from the right side. 

 U x . Ditto, from the left side. 

 Ua. Upper organ from above. 

 Ub. Upper organ from behind. 

 R. Right clasp. 

 Rb. Right clasp from above. 

 L. Left clasp. 

 Lb. Left clasp from above. 

 Figs. 1-16 are magnified 20 diameters. 

 Fig. 17 is magnified 35 diameters. 



