AMERICAN COLEOPTERA. 261 



with fine Sf)inules. Anterior tibise with two spinules at outer apical angle, the 

 middle and posterior finely spinulose along the entire margin, the tip fimbriate 

 with closely placed spinules of unequal length. 



This genus represented only by Catoj)s opnais Suy, is allied to 

 Chofeoa, but differs in the structure of the antennae, the tibial spurs 

 and the absence of dilatation in the middle tarsi of the male. 



1*. opaca Say, {Catops). — Oblong-oval, a little narrower posteriorly, thoracic 

 and elytral margins very nearly continuous, black feebly shining, clothed with 

 short dark brown hair. Head finely and densely punctured. Antennae attain- 

 ing the hind angles of the thorax, piceous, apical and two basal joints pale. 

 Thorax less than twice as wide as long, narrowed in front, apical angles broadly 

 rounded, apex truncate, sides broadly arcuate, at base slightly narrower, hind 

 angles obtuse, base slightly arcuate, surface densely and finely punctulate. 

 Elytra as wide as the thorax, a little more than twice as long as it, sides 

 moderately arcuate and gradually narrowed toward the tips which are more 

 obtuse in the male than in the female, the latter has the sutural angle 

 very slightly prominent, surface moderately densely punctulate, substriate 

 near the tip, the sutural stria well marked. Body beneath and legs moder- 

 ately densely punctulate, the femora slightly strigose. Length .20 inch ; 5 mm. 

 (PI. V, fig. 14). 



Occurs in the northern States from Canada to Pennsylvania and 

 Ohio, not common. 



PTOMAPHAGUS Illig. 



Form oval or slightly oblo"ng or cuneiform. Head suddenly narrowed behind 

 tlie eyes, occiput with a ridge received against the apex of the thorax. Eyes 

 flattened posteriorly. Antennae nearly as long as the head and thorax, gradu- 

 ally clavate, eighth joint always shorter and often a little narrower than the 

 seventh and ninth. Maxillary palpi with last joint short, subulate, third 

 elongate-oval truncate at tip, second slender. Middle coxse separated by the 

 mesosternum which is moderately strongly carinate. Posterior coxae contiguous. 

 Tarsi slender the anterior alone dilated in the male, the middle and posterior 

 with the first joint as long or a little longer than the next two. Tibiae finely 

 spinulose externally, the spurs slender but not long. 



This genus has been alternately suppressed and revived by authors 

 who have treated this family more or less completely, but the charac- 

 ters separating it from the surrounding genera are so well marked and 

 the facies of the species so decided that it seems as well founded as 

 any of the genera of the tribe. ^ It does not seem, however, that 

 Catopomorphus is sufficiently distinct from the present, the triflin"- 

 difference in the size of the eighth joint of the antenna hardly suffices 

 to separate it generieally. 



The species of this genus all have the elytra and often the thorax also 

 strigose, a character not elsewhere found well marked in our species of 

 this tribe except in Adelops. Both sides of the continent furnish repre- 

 sentatives of the genu.s, the greater number are however eastern. 



