AMERICAN COLEOPTERA. 2G1 



with fine spinules. Anterior tibije 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 (Jutops opncus S.iy, is allied to 

 Choleoa, but differs in the structure of the antennas, the tibial spurs 

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



I». opaca Say, (Caf!ojos).— Oblong-oval, a little narrower posteriorly, thoracic 

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

 6hort dark brown hair. Head finely and densely punctured. Antennse 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. 

 (Pl.V, fig. 14). 



Occurs in the northern States from Canada to Pennsylvania and 



Ohio, not common. 



PTOMAPHAGUS Illig. 

 Form oval or slightly oblong or cuneiform. Head suddenly narrowed behind 

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

 flattened posteriorly. Antennse 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 coxae 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 o-enus has been alternately suppressed and revived by authors 

 who have treated this flmiily 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 trifling 

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

 to separate it generically. 



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

 stri"-ose, a character not elsewhere found well marked in our species of 

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

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



