June i 9 oo.] Casey : On North American Coleoptera. 147 



Male club relatively still shorter, the last joint but slightly more than twice as long 

 as the two preceding combined ; prothorax less' transverse and less strongly and 

 densely punctured, not quite twice as wide as long, the male narrower and the 

 female larger than in deficiens. Length $ 2.8-3. 1, ? 3-8-4-5 nun.; width $ 

 I.4-I.65, 9 2.0-2.4 mm. Iowa (Keokuk) and Nebraska; \spurcus Lee, fior~ 

 icola and obscurus Mels., i. litt.] cylindricornis Sn 



8 — Body narrowly oval or oblong-oval, the head and pronotum strongly and moder- 

 ately closely punctured, the elytra unusually sparsely and much less coarsely so ; 

 hypomera but feebly concave ; last joint of the male antenna;- black, longer than 

 the entire preceding part and four times as long as the two preceding joints com- 

 bined ; female club black ; under surface piceous, the legs ferruginous through- 

 out. Length $ 2.9, 9 3.6-4.1 mm.; width $ 1. 35, 9 1.7-2. 1 mm. Cali- 

 fornia to Utah rufipennis Lee. 



9 — Head and pronotum generally blackish-piceous, the elytra rufous, the entire body 

 sometimes testaceous ; hypomera deeply concave ; punctures moderately dense , 

 those of the pronotum finer than the elytral ; male club very elongate and 

 slender, the last joint contorted distally, longer than the entire preceding parts. 

 Length $ 3.2, 9 4.9 mm.; width <J. 1.65, 9 2 -4 mm - Towa (Keokuk); 

 [dickrous Lee] bicolor G. &> H. 



Head and pronotum blackish, the elytra somewhat, but not very noticeably, paler 

 piceo-rufous ; in body and antennae nearly similar to bicolor, the former obviously 

 narrower and relatively more elongate-oval. Length $ 2.9-3.4, 9 4.4 mm.; 

 width $ 1. 4-1. 7, 9 2.1 mm. Nebraska to Utah elongatulus, sp. nov. 



As may be inferred from the detailed measurements given in the 

 table, the female is generally very much larger than the male, but in 

 extricatus and deficiens there is greater equality in this respect, judging 

 from the material accessible to me. The discriminative work hitherto 

 bestowed upon this comparatively monotonous, and consequently less 

 interesting, genus, has been very superficial, and detailed study of the 

 male antennae reveals a variety of 

 structure too great apparently to be 

 the result of fortuitous variation ; 

 some of the names proposed by 

 LeConte must therefore be restored 

 to specific weight ; rufipennis is, in 

 fact, quite isolated as a species— more z> Antennal club of Attagenus extri . 



SO than pellio when compared with catus $', 2,same of A. cylindricornis: 3 



,- , rr^i i ■ same of A. deficiens : 4, same of A. elonga- 



piceus for example. The diagrams Mus . Sjantennaofzw , w longuius. 

 given in the accompanying cut will 



serve to show some of the variations in the club of the male antenna?, 

 and, although some variability in an organ so over-developed is to 

 be expected, it will be probably granted that such extreme variations, 



