142 NEW SPECIES MELYRIDAE, CHRYSOMELIDAE AND TENEBRIONIDAE 



tened; metatibiae distinctly thickened in apical two-thirds, very feebly 

 arcuate; fifth ventral abdominal segment about as long as the second, 

 broadly and transversely truncate at apex ; a sixth segment is visible and 

 the under surface of the pygidium rather flat and fringed with quite short 

 and stout black hairs. 



Female unknown. 



Measurements. Length, 3.4 mm.; width, 1.2 mm. Holotype, male, 

 in the collection of the California Academy of Sciences. Described from 

 a unique, collected by Mr. E. P. Van Duzee, on April 21st, 1918. 



Type locality. Salada Beach, San Mateo County, California. 



Cephalicus is a very distinct and unique species in its prominent and 

 peculiarly convex eyes, broad head, stout antennae and legs, besides the 

 preponderance of dark hairs on the upper surface with consequent 

 obscuration of the maculation. 



Listrus coloradensis, new species. Form oblong, subovate, moder- 

 ately convex. Color black, surface rather dull and with a feeble bluish 

 lustre ; antennae piceous, legs rufo-piceous. 



Pubescence very short, rather coarse and more or less squamiform, 

 not dense, rather inconspicuous, plumbeo-cinereous in color above but 

 more cinereous beneath where it is somewhat longer and closely recum- 

 bent ; noticeably coarse on front of the head. 



Head slightly transverse, eyes rather large and moderately promi- 

 ment ; front broadly impressed, more strongly and somewhat bi-impressed 

 between the antennae, densely but not coarsely indentato-punctate, some- 

 times with a small subglabrous convexity close to the middle of the 

 epistomal base. Antennae rather short and somewhat stout and nearly 

 similar in the sexes; second joint slightly oblong-oval, just a little longer 

 than wide ; third distinctly obconical and nearly twice as long as wide ; 

 fourth a little stouter, subobconico-triangular and about as long as the 

 sixth ; fifth subequal to the ninth in width, subtriangular and serrate, very 

 little longer than wide and obliquely truncate at apex ; sixth and eighth 

 subequal, quite distinctly smaller than the contiguous joints, very slightly 

 wider than long and feebly triangular ; seventh triangular and about as 

 long as wide, more prominent anteriorly than posteriorly, slightly longer 

 than the sixth or seventh ; ninth and tenth stouter, a little wider than long 

 subtriangular, sides feebly arcuate ; eleventh obovate-triangular, scarcely 

 a half longer than wide. 



Pronotum about a fourth wider than long, quite equal in width to the 

 elytral base; apex arcuato-truncate in circular arc; sides moderately 

 rounded in basal half, thence almost straight to the apical angles as viewed 

 from above, serrules small, fimbriae rather short and stout ; apical angles 

 obtusely rounded ; base broadly arcuate, rounding evenly into the sides ; 



