86 BULLETJN 64. 



forms. The venation of the species is almost exactly the same. 

 In C. floridus the wing is a little narrower and the apex is more 

 acute. The antennae exhibit about an equal degree of speciali- 

 zation. In both species the valves are nearly triangular, while 

 the harpe retains the elongate form. An accessory spine has been 

 developed, and in C. floridus it is at the apical third, while in C. 

 giradellus it is at the base of the valve. The species agree in the 

 great reduction of the uncus. If the lower limb be taken as 

 unity, the difference in length between the uncus and the lower 

 limb will give the amount of the reduction. The reduction of 

 the uncus seems to be correlated with the greater efiSciency of 

 the harpe or of the accessory spine. In C, floridiis the uncus 

 seems to be double ; both lateral and ventral aspects are figured. 

 The genital plates of the females show considerable similarity, 

 C. floridus is the more specialized. The form of the valve and 

 the accessory spine connects this group with the Unistriatellus 

 Group. 



Subdivision //.—Plates III., VIII., XII., 'XIV., Figures 15, 

 16, and 17. 



This subdivision includes three highly specialized forms, which 

 seem to be tips of as many lines of development. They agree in 

 having the harpe highly specialized at or near the tip. 



15. Crambus elegans. The fore wing is very broad. This 

 generalized condition of the wings is correlated with highly 

 specialized antennae in both sexes. The tip of the valve is more 

 or less oval. The harpe has coalesced at the base with the valve. 

 There has been a shortening of the harpe and the accessory spine 

 is strongly developed and near the tip of the harpe. Both the 

 uncus and the lower limb seem to have suffered reduction. The 

 form of the genitalia and of the joints of the antennae seem to 

 show a relation between this species and a form allied to C. teter- 

 rellus. 



16. Cra^nbus turbatelhis. In this species the fore wing is 

 quite generalized. The branches of the veins are all independent 

 and arise rather near the base of the wing. The antennae exhibit 

 some degree of specialization. In the clasps there is a marked 

 divergence. The valves have coalesced mesally and the harpes 

 likewise ; the harpes have also become anchylosed with the uncus 

 and scaphium. Though the valves are twisted they have the 



