Mar.igoc] Dyar: On Larv^ of the Genus Arctia. 39 



The species is a trifle larger than the two preceding. The appearance 

 of my 20 specimens is quite different from //^a/.r^A?, but yet I have no 

 strong character to separate them by. Professor French's description of 

 the larva makes it black without a dorsal line. I have three alcohohc 

 larvae (Dept. Agr. 2587 and Riley coll. 1 261) as well as descriptions 

 (Dept. Agr. nos. 2544, 2581 and 2587). The bred mothsare vittata, 

 but not all perfectly typical as in none of them, except no. 2544, is 

 the abdomen broadly black. The larva of the typical vittala (no. 

 2544) is said to be black, body olive, the warts black and rough; 

 hair brown, lighter in front ; spiracles orange. This agrees with Pro- 

 fessor French. The others are the same ; but in no. 2581 ''an indis- 

 tinct pale orange dorsal line" is mentioned and one of the alcoholic 

 no. 2587 has a distinct, broad, broken white dorsal line. Of course 

 these larvai may have been mixed ; but the matter is not decided be- 

 yond question as to whether ///.//mr/^ or vittata has the larva with the 

 dorsal stripes, or whether this is a specific character at all. 



I believe some of the members are more familiar with these forms 

 than I am, and I hope they will put their notes together for publication. 

 Much evidence from many sources is needed in this connection. 



9. Intermedia is often confused with virgo, but as I have shown 

 you already, quite unnecessarily so. The moth inhabits the Atlantic 

 states, but has a southern range. Specimens occur in New York, but 

 I do not think it is common here or extends much farther north. It 

 is simply an enlarged edition of parthenice, which replaces it in the 

 north, the transverse bands more distinct and more frequently travers- 

 ing the submedian bar. There are absolutely no firm characters 

 between this 2^x1^ parthenice ; but the life history is entirely unknown, 

 and it may be found to furnish some further points of difference. I 

 recommend this species to your attention, as any information on the 

 early stages will be worthy of note. 



10. Parthenice is fairly common in the northern Atlantic states, 

 northern New York, New Hampshire and Maine to Wisconsin : south- 

 ward it is replaced by intermedia. The moth flies in August, some- 

 what later than virgo, with which it is, usually associated. I think 

 there is only one annual generation. The species is allied to inter- 

 media, as I have shown ; but it is also very near to rectilinea. The 

 veins are a little more heavily lined than in rectilinea with no ten- 

 dency to obsolescence, and the bands are more or less bent, not rigid. 

 The color of the hind wings, too, is a little more orange-red. Again 



