138 • Journal New York Entomological Society. [Vol. vn. 



equal, narrower, elongate and cylindric, six and seven shorter, the latter a little 

 broader toward tip, eight to eleven forming the usual narrowly oval compact 

 club, the eleventh joint short and somewhat spongy-pubescent ; prothorax but 

 little more than twice as wide as long, the sides parallel and straight, rounding 

 and slightly convergent at apex ; elytra but little wider than the prothorax, much 

 longer than wide, obtusely and broadly subtruncate at tip ; mesocoxal arc not 

 attaining the episternal suture, the metasternal curving outward and very short, 

 attaining apical fourth of the segment; genital segment distinct and well developed. 

 Length 1.4 mm. ; width 0.65 mm. Arizona (Tucson) rectus, sp. nov. 



The type was taken by the writer some years ago, but no note 

 relative to habits can be found ; if my memory serves however, it was 

 taken while sorting riparial detritus. 



Scymnus Kug. 



This is one of the largest genera of American Coleoptera. The 

 species possess a remarkable uniformity of appearance, the body be- 

 ing oval or oblong-oval and always pubescent throughout, with the legs 

 almost completely free, the anterior alone being somewhat contractile, 

 with an attendant depression or well-defined pit at the base of the 

 epipleurae for the tip of the femur. The prosternal ridges are impor- 

 tant, on some occasions, in discriminating species which may be closely 

 allied otherwise. The postcoxal plates or arcs of the first ventral 

 segment serve as sharply defined criteria in grouping the species, but 

 the several sections can scarcely be regarded as distinct genera. 



The species have been "almost completely neglected in the United 

 States, as far as systematic work is concerned, and the recent revision 

 of Dr. Horn (Tr. Am. Ent. Soc, XXII, p. 81) had no further aim 

 than an exposition of the groups, into which the genus can be advan- 

 tageously divided, together with the publication of a few of the more 

 strikingly distinct species. The latter are very difficult to discriminate 

 in many parts of the series, and especially in the small and obscure 

 forms of the Pacific coast and Arizona. I am not at all confident that 

 my interpretations may be entirely correct, but it can be said at least 

 that the total number of species here recorded will be increased rather 

 than diminished in the future. I have been accumulating a large 

 material during many years, with the object of monographing the 

 genus, and all localities are tolerably well represented. The following 

 table may assist in identification, but actual comparison will be neces- 

 sary in many cases : — 



f 



