I02 A luials Entomological Society of America [Vol. Ill, 



figure 25. The arrangement is about the same in Phryganea 

 (one of the herbivorous caddis-flies), but in a savvfly, as shown in 

 figure 32, there is no close relation to the others, the modifications 

 having taken quite a different direction. In all three of these 

 non-lepidopterous types the lacinia of the maxilla is well devel- 

 oped, but in the Elater the proximal joint of the galea is open on 

 the inner side, and one can see how the lacinia might easily fuse 

 to it in much the same way as the galea is fused to the two basal 

 joints of the palpus in the higher caterpillars. 



Especially striking is the complete disappearance of the 

 glossai and paraglossae, not only in the larvae figured, but in the 

 adult Elater also. The setae marked ai and the more ventral 

 of the two sclerites which form the ring c, come closest to the 

 normal position of the glossae and paraglossae. 



Artificial Key to the Families of Frenat^. 

 (Incomplete in the Microlepidoptera.) 

 1. Prolegs each of one or two transverse bands of rudimentary hooks, no 



anal prolegs Tineidae 



1. Hooks of yjrolegs in curved or longitudinal bands, or in a circle, anal pro- 

 legs wanting only in Drepanidae 3 



1 . .\o prolegs, or prolegs without hooks 2 



2. Slug-caterpillars, e.xposed feeders Eucleidae 



2. Slender leaf-miners Nepticula and other Tineina. 



:i. Hooks of prolegs in two curved transverse bands ^Egeriidae 



.S. Hooks of prolegs in a complete circle or horseshoe 4 



;j. Hooks of prolegs in a longitudinal band, on inner side of leg, with or without 

 a rudimentary outer series 8 



•4. With much fine secondary hair ."1 



4. With a single subprimary on the proleg Lacosomidae 



4. Without secondary hair (j 



.">. Head much larger than second segment Hesperiidae 



5. Head smaller than second segment Megathymidae 



G. Circle of hooks interrupted caudo-mesally, and as complete ><u anals as 

 on the other prolegs Psychidae 7 



n. Circle of hooks complete, or interru])ted outwardly, anal prolegs with a 

 shorter, straight or curved band. 

 The typical Micros, including Cossidae, Thyrididae and Orneodidae. 



7. Seta i of abdomen dorsal of ii, front nnuh liigher than wide. . Solenohiinae 



7. Seta ii of abdomen dorsal of i, front as wide as high Psychinae 



8. Hooks of prolegs alternately of three lengths, at least with some short 



ho(jks on anal prolegs Papilionina !» 



S, Hooks of prolegs alternately of two lengths 21 



S. Hooks of prolegs of the same length, or gradually growing shorter to the 



end of the rows 12 



'.». Maxillary lobes minute; labrum with IS or more secondaries Papilionidae 



[). Maxillary lobes at least half as long as terminal joint of paljnis; lalirum 



with less than 18 secondaries 10 



10. Slugcaterpillars with small heads Lycaenidae 



10. Normal cylindrical caterpillars 11 



