558 ' SUPPLEMENT, 
Hab. Mexico, Paso del Norte in Chihuahua (Hoge). 
Two specimens. Allied to the Californian H. rugicollis, Lec., and H. strigicollis, 
Hom, but not agreeing with the description of either of these species. In this and 
the next two species the apical joint of the maxillary palpi is narrower than usual in 
the genus Helops. 
17. Helops spissicornis. 
©. Elongate, narrow, convex, slightly shining, piceous or brownish-piceous; the oral organs, antenne, and legs 
ferruginous. Head very densely, moderately coarsely punctured, the punctures between the eyes here 
and there confluent ; last joint of the maxillary palpi narrow, subtriangular ; antenne robust, short, 
scarcely reaching beyond the base of the prothorax; prothorax longitudinally convex, nearly as long as 
broad, equal in width at the base and apex, widest at the middle, the sides feebly rounded and very 
faintly margined, the base truncate, the anterior angles rounded, the hind angles very obtuse, the surface 
punctured like that of the head, but with the punctures separate one from another; elytra oblong-oval, a 
little wider than, and not quite three times as long as, the prothorax, slightly rounded at the sides and 
narrowed at the base, with rows of fine, oblong, partly confluent punctures placed in almost obsolete 
striee, the punctures becoming coarser towards the suture anteriorly, the interstices thickly, finely punc- 
tate, flat, the third, fifth, and seventh feebly raised at the apex, the humeri distinct ; beneath shining, 
obscure ferruginous, sparsely pubescent, very coarsely and rather densely punctured, the punctures on the 
flanks of the prothorax very dense, separate one from another; prosternum declivous behind; legs stout, 
coarsely punctured; body apterouse 
Length 10-11, breadth 33-33 millim. 
Hab. Mexico, Villa Lerdo in Durango (/ége). 
Two specimens, This species is very similar to H. rastratus, but differs from it in 
having the thorax more cylindrical, nearly as long as broad, more distinctly margined 
at the sides, and with the punctures separate one from another; the elytra less 
rounded at the sides in front, and with distinct humeri; the underside more closely 
and more coarsely punctured. The elytra are very similarly sculptured in both 
species, of which female specimens only have been received. 
18. Helops seriatoporus. 
¢@. Elongate, convex, rather narrow, slightly shining, piceous or rufo-piceous; the oral organs, antenne, and 
legs obscure ferruginous. Head very densely, coarsely punctate, the punctures separate one from 
another ; last joint of the maxillary palpi slender, oblong-ovate, truncate at the tip; antenne moderately 
stout, extending to far beyond the base of the prothorax ; prothorax longitudinally convex, about one- 
fourth broader than long, almost equal in width at the base and apex, widest at the middle, the sides 
without marginal carina (except at the base), feebly rounded, sinuate before the base, the hind angles 
rather prominent, the base truncate, the anterior angles obtuse but distinct, the surface punctured like 
that of the head, the punctures separate one from another; elytra oblong-elliptic, considerably wider 
than, and about three times as long as, the prothorax, with rows of oblong, coarse, deep, approximate 
punctures placed upon almost obsolete strie, these punctures sharply cut and nearly uniform in size, the 
interstices thickly, finely punctate, flat, the humeri completely effaced; beneath obscure ferruginous, 
very coarsely, rather densely punctured, the venter more sparsely punctate, the punctures on the flanks 
of the prothorax very dense, separate one from another ; prosternum declivous behind; legs stout, very 
coarsely and densely punctured ; body apterous. 
Length 9-114, breadth 34-41 millim. 
