Dec, i(,o7.] Dyar : New York Slug-Caterpillars.. 221 



the appendages become equally long. The laterals of these segments 

 are also slightly shorter than the other laterals. 



These segments, 5, 7, 9 and 11 seem to be "weak" segments, 

 like joint 11 \n A crony eta, which Dr. Chapman has described. The 

 weakness is shown, in the Phobetron group of species, on joint 5 by the 

 absence of the lateral horn ; on 7, 9 and 1 1 by the alternation of the 

 setae in stage I and the shortness of the horns on those segments 

 subsequently. 



Affinities, Habits, Etc. 



The larva is closely allied to Phobetron pitliecium Sm. & Abb., and 

 to Alarodia slossonice Pack. In color, the equal length of the horns, 

 and less closely in the hair structure it is nearest slossonice ; but in the 

 number of the horns and their arrangement and the narrowness of the 

 dorsal space it is identical ■wixh pitheciion. The adults, too, present a 

 sexual dimorphism, and are somewhat similarly colored to pitheciiim, 

 to which on the whole, it is most nearly allied. In this species the 

 subdorsals of joints 4 to 1 1 only are functional, while \x\ slossonice X^o^^ 

 of 3 to I 2 are so and the side horns are much more completely sup- 

 pressed than in beiiteumiielleri and pitliecium. Beiitentnuelleri is 

 structurally congeneric with pitheciiiin. Its adaptation is different ; 

 being glass-green with whitish fluffy hair, and this probably necessi- 

 tates the equal length of the horns. Otherwise the larvie differ but 

 slightly. The lateral horns are longer and slenderer than m pitheciiim, 

 and their hairy coating has more degenerated. The subdorsals have 

 the basal bulbs circular and prominent, not flattened-cordate, and their 

 dorsal forks are slenderer and interlace on the back. The hairs remain 

 long and less specialized than in pitheciiim. The horns are more 

 readily detachable. In slossonice the horns remain attached throughout 

 life and are found within the cocoon ; in pitheciiim, they are shed 

 spontaneously at the time of spinning, and are found attached to the 

 outside of the cocoon ; but in beutenmiielleri they are shed in a mass as 

 soon as the larva has ceased feeding and before it leaves the tree to seek a 

 place to undergo its transformations. During life, a slight touch serves 

 to detach the horns, which are nevertheless not deciduous at moulting. 

 The species ranges along the coastal region to the foot of the Ap- 

 palachians, from northern Florida to southern New York. It should 

 occur on Long Island, though I have not found it there. It probably 

 ranges along the Gulf coast to Texas, although all records are lacking, 



