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 THE GENUS DAT AN A Walker. 



HY HARRISON C. DYAR. 



I had originally prepared some notes on this genus for Ento- 

 MOLOGiCA Americana, but in response to the request of Prof. 

 Smith I haYe enlarged them somewhat to include all the species. 

 Eight species inhabit the State of New York, and I include four 

 others not found here. 



In the following I give distinctive characters only when the spe- 

 cies has been already well described, and a brief description of the 

 larva, when known. I have not attempted to give a full bibliography, 

 but give a reference for the original description, and one for the 

 larva, the latter distinguished by an asterisk. 



Datana aagnsii Grote and Robinson. 



G. & R., Proc. Ent. .Soc. Phil. vol. vi, p. 9* pi. 2, fig. i. 

 Beutenmiiller, Can. Ent. vol. xx, p. 135.* 



Readily known by its dark smoky brown color, common to the 

 whole insect both above- and below. The lines are five in number, 

 and are arranged as in the other species of this group (§1 of my 

 table). They are variable in position and furnish no distinctive 

 characters. The discal spots are often slight, the outer sometimes 

 linear. The description by Grote and Robinson is most excellent. 



The larva is black, the lines fine and colored light yellow. 



Food-plants: Hickory, Walnut, Birch. 



Datana ministra Drury. 



Drur}- (as Phakena), Exot. Lep. vol. 2, p. 25, pi. 14, lig. 3. 

 G. & R.. Proc. Ent. Soc. Phil. vol. vi, p. 11. 

 Beut., Can. Ent. vol. xx, p. 16.* 



This species is of a pale yellowish brown with usual markings. 

 The discal spots are usually absent, and sometimes also the fourth 

 line. The hind wings are pale. 



The larva has often been described, frequently the other species 

 being confounded with it. It is black, with the cervical spot vellow, 

 the lines sulphur-yellow, not confluent posteriorly. 



P'ood-plants: \arious fruit trees, Linden, Oak, Elm, etc. 



Datana californica Riley, MS. 



Prof Riley's description has not yet appeared, but I give a 

 brief characterization in order that I may include the species in my 

 table: 



