juneigoo.i Casey : On North American Coleoptera. 101 



by LeConte, but in reality forms the type of a new Melandryid genus, 

 which will be described further on in the present paper, and the con- 

 color of the same author, I have been unable to trace. 



Henoticus Thorns. 

 The general structure of the body, presternum, legs and tarsi, trophi 

 and antennceare here almost precisely as in Cryptophagus } but the con- 

 verging sides of the front above the antennae are finely retlexo-margi- 

 nate, and the structure of the sides of the prothorax wholly different, 

 there being no trace of thickened nodal point, apical or otherwise ; 

 the edge is regularly spiculato -serrulate throughout, except for a short 

 distance near the basal angles ; it also differs in having the fine sub- 

 sutural line entire or subentire. The deep groove near the basal mar- 

 gin of the pronotum connecting the conspicuous basal fovea? is similar 

 to that of Crosimus and without trace of medial interrupting carina. 

 The elytral punctures are arranged wholly without order, the pubes- 

 cence short and .the pronotum without trace of callous spots. The 

 species known thus far are two in number, and are both very abun- 

 dant in individuals ; they may be outlined as follows : — 



Black or blackish in color throughout when mature, the legs and antennas paler, pol- 

 ished, oblong, convex and moderately stout in form, the pubescence short, very 

 sparse, even and reclined ; eyes well developed though scarcely half as long as 

 the head ; prothorax moderately transverse, the sides very nearly parallel, broadly 

 and evenly arcuate, the serratures even and moderately developed, some eight to 

 ten in number; punctures not coarse but deep, moderately close-set, the sur- 

 face rather convex ; elytra oblong, distinctly wider than the prothorax and three 

 times as long or a little less, obtusely rounded behind, the punctures coarse and 

 decidedly sparse. Length 1.7-2. 1 mm.; width 0.65-0.85 mm. Entire northern 

 America, Siberia and northern Europe. [Paramecosoma denticulata Lee] 



serratus Gyll. 



Pale testaceous in color throughout, shining, the pubescence not quite so short, rather 

 abundant and suberect, bristling with slightly longer hairs toward the sides ; eyes 

 small and extremely convex ; prothorax strongly transverse, distinctly widest 

 slightly before the base, the sides thence rather strongly convergent and straight 

 and provided with some eight very strong, acute and equal serratures to the apex ; 

 surface feebly convex, more finely, rather closely punctate, evidently impressed 

 near the lateral margins toward apex ; elytra but little wider than the base of the 

 prothorax and three times as long or more, very finely, though not very coarsely, 

 punctate. Length 1. 75-2.1 mm.; width 0.78-0.9 mm. California (San Fran- 

 cisco to Monterey) californicus Mann. 



The latter of these was assigned to Cryptophagus by its author. 

 The Paramecosoma inconspicua Lee, i. litt., is unknown to me, but 

 is probably founded upon a very small example of serratus. 



