160 MEMOIRS ON THE COLEOPTERA 



value. In this catalogue Pristodactyla is ascribed to Chaudoir, 

 but it is given to Dejean in the Nomenclator Zoologicus of Scudder 

 and also in the Munich catalogue. 



The species of Pristodactyla are not numerous, comprising at 

 present the Feronia impunctata of Say, dubia and advena of LeConte 

 and the Mexican Calathus ovipennis Putz.; also corvina Lee., which 

 has been suppressed as a synonym of impunctata, but which seems 

 to be specifically distinct, being larger and narrower than impunc- 

 tata and more southern in habitat; at any rate its status should 

 apparently not be less than that of a well marked subspecies of 

 impunctata. The following is another subspecies of impunctata: 



Pristodactyla impunctata ssp. convexa nov. Elongate-oval, convex 

 and polished, deep black, the legs and antennae dark testaceous; head 

 about half as wide as the prothorax, the latter large, nearly a fifth wider 

 than long, the sides rounded, more converging basally, the angles very 

 broadly rounded; surface convex, very finely reflexed at the sides, rather 

 abruptly broadly so at base, uniting with the deep lineiform longitudinal 

 impression near outer and basal fourth, the median stria distinct; elytra 

 elongate-oval, not quite a third wider than the prothcrax, the striae 

 rather fine, deeply impressed suturally. Length (9) 11.2 mm.; width 

 4.3 mm. New York (Lake Champlain). 



On comparing the type with a female of impunctata from Lake 

 Superior, it is readily perceived to be larger and broader, with more 

 elongate elytra, having the striae more deeply impressed inwardly 

 and the antennae longer and more slender; the typical impunctata 

 is represented in my collection from Rhode Island, Lake Champlain, 

 Pennsylvania and northern Wisconsin. 



Pristodactyla arizonica n. sp. Elongate, rather depressed, piceous- 

 black, moderately shining, the elytra opaque; legs dark piceous; tarsi 

 and antennae testaceous, the latter with the basal joint blackish; head 

 rather large, fully three-fifths as wide as the prothorax, the antennae 

 slender, with elongate joints; prothorax about as long as wide, the base 

 three-fourths the maximum width and four-fifths as wide as the apex, 

 the sides broadly and almost equally rounded but more converging basally, 

 the angles very broadly rounded; surface feebly convex, very finely 

 reflexed at the sides, gradually very slightly less finely toward base, the 

 longitudinal depressions rather broadly impressed but not deep, connected 

 by a rather evident, medially somewhat anteriorly angulate, transverse 

 impression, the anterior impression obsolete; elytra oblong-oval, with 

 parallel, evenly and broadly rounded sides, obtusely rounded at apex, 

 almost one-half wider than the prothorax, two-thirds longer than wide, 

 depressed above, opaque, with very fine unimpressed striae and very flat 

 intervals. Length (cf) 11.7 mm.; width 4.2 mm. Arizona. 



