386 



lines in second lobe, A small blackish oblique spot similar to that in mathcw- 

 ianus occurs before cleft, continued toward costal spot by a light brown shade. 

 Costa marked with a faint shade at middle, a long blackish spot above base of 

 cleft and two beyond, the outer larger and continued into a white patch in 

 the fringes. Apex of first lobe with a black dash, preceded by another on 

 inner margin, the two connected in dark specimens. Inner lobe with black 

 dot at apex and two on outer margin, the outer followed by a white pencil in 

 the fringes and the inner by a broader white cluster. Fringes otherwise gray- 

 brown. The white areas have a variable number of blackish basal scales. En- 

 tire wing more or less heavily irrorate with blackish scales which tend to fonn 

 longitudinal lines. Secondaries gray-brown with concolorous fringes. Expanse 

 23-25 mm. 



The male genitalia are provided with a heavy tuft of long hairs 

 on the outside of each valve. Otherwise they are rather .similar to 

 those of the preceding species. 



Distribution: Que. to Man. and W. la., south to N. J. and III. 

 June and July. 



Fcrnald's types arc four specimens from New York, one S , two 

 9 and a broken specimen. 



We have seen no western specimens which we regarded as true 

 eiipatorii, and so feel that Walsingham's records in the Biologia, 

 Zeller's western "crcttdactylus" and later references pertaining to the 

 latter probably concern other species. Its possible relation to the 

 allied western species as treated in the literature is discussed under 

 guttatns. 



The species may be recognized most readily by the tarsi, but 

 average specimens are conspicuous in that the costal and inner areas 

 of the primaries are in such sharp contrast. Very dark specimens, 

 of which we have several from Maine and Quebec, are much like 

 guttatns in appearance. 



The larvae feed on Rufator'uim, and are gregarious. They occiu" 

 in considerable numbers on the terminal shoots of the plants, which 

 they render conspicuous by their mutilations of the leaves and moder- 

 ately extensive spinning. We have selected Dr. McDunnougli's ac- 

 count in the Canadian Entomologist to quote. Preserved specimens in 

 our possession agree very well with his description of both larva and 

 pupa. 



"Larva (full grown). — Head pale reddish ochre. Body pale green, be- 

 coming dorsally broadly suffused with purple-red when fully developed ; a nar- 

 row ochreous dorsal stripe slightly broken centrally on each segment by a 



