596 Goleopterolorjical Notices, VI. 



absence of a lateral submarginal line on the pronotum. The elon- 

 gate head is not strictly peculiar to Mecomycter, as it exists to a 

 pronounced degree also in Vectura. The two species can be 

 separated thus : — 



Prothorax elongate, -witliout a lateral projection behind the middle. 



1. oiiialiiiiis 

 Prothorax transverse, with a conspicuous projection at the side at Ijasal two- 

 fifths 2. facetus 



The genus is distributed tlirough the arid regions from Kansas 

 to Arizona. 



1. m. oiualiiiuiii Horn— Trans. Am. Eut. Soc, X, 1882, p. 12G. 



Stout, moderately convex, feebly shining, i)ale testaceous in 

 color, the l)ase of the head, maxillary palpi, outer seven joints of 

 the antennffi and entire under surftxce of the hind liody, except the 

 me^osternal side-pieces, black or blackish; elytra black, with the 

 apex and an elongate area from the humerus to apical third of 

 each pale testaceous ; legs pale throughout ; pubescence short, 

 rather sparse, pale in color, the elytra with a few scattered hairs 

 which are slightly longer and more erect ; marginal fringe obso- 

 lete. Head three-fourths as wide as the prothorax and nearly 

 twice as long as wide, flat and coarseh* punctate, the interspaces 

 minutely punctulate ; eyes well developed, distant from the liase, 

 the neck narrowed toward base; antenna? one-third longer than 

 the prothorax, the first two joints stout, the next two slender, the 

 remaining seven larger and feebly incrassate to the apex, the tenth 

 slightly transverse. Prothorax fully as long as wide, the sides 

 evenly convergent and nearly straight from the oblique and 

 slightly sinuate basal angles to the apex, the apical angles obtuse 

 but not rounded from above, the apex truncate, narrower than the 

 base which is broadly and evenly arcuate ; marginal acute line far 

 down on the flanks, very fine, non-serrulate and curving upward 

 in a broad arc toward apex ; disk rather coarsely and rugosely 

 punctate. Elytra scarcely one-half longer than wide, feebly di- 

 lated behind and more than twice as wide as the pro- 

 thorax, evenly and broadly rounded at apex; humeri tumid and 

 l)roadl3' exposed at base ; lateral edges fine and not reflexed ; disk 

 coarsely but not densely, subrugosely punctured toward base, 

 very feebly sculptured toward apex. Legs rather long and 

 slender. Length 3.0 mm.; width 1.2 mm. 



