360 MEMOIRS ON THE COLEOPTERA 



taken in Maine, by Mr. C. A. Frost. Interruptus is a subspecies 

 or variety of undulatus, but hmulatus Kirby, I have not been able 

 to identify. Undulatus represents a very common American type of 

 the genus, including a number of species all distinctly characterized; 

 as far as represented in my cabinet they may be known by the fol- 

 lowing tabular statement. The remarkable sexual difference in the 

 sculpture of the head does not seem to have been noticed hereto- 

 fore; in the male the sculpture is very minute, dense and dull, 

 excepting in an abruptly denned basal band ascending at the 

 sides along the inner margin of the eyes, this band being shining 

 and coarsely punctate; in the female this structure is only trace- 

 able by coarser punctures at the base of the occiput than else- 

 where, but the front is more pubescent. The males of undu- 

 latus seem to be far more abundant than the females, which is not 

 the case apparently with the west coast forms here defined; the 

 allies of undulatus are as follows: 



Prothorax inflated and strongly rounded at the sides, evidently wider 

 than the base of the elytra, brownish-black, the legs dark red-brown, 

 the antennae piceous; head finely, strongly, rugosely punctate, more 

 coarsely medially toward base and along the latter; antennae but 

 slightly overlapping the base of the elytra, the third joint not quite 

 as long as the first; prothorax fully one-half wider than long, widest 

 just behind the middle, sculptured and ornamented with narrow 

 apical and basal dense pale pubescence as in undulatus; elytra 

 similar but rather more elongate, the apices obliquely arcuato- 

 truncate; pale spots as in undulatus though partially yellow and 

 with the ante-apical fascia subentire, not broken into two spots; 

 legs moderate; abdomen with numerous long erect hairs, the shorter 

 white hairs denser along the segmental apices. Length (9) 14-5 

 mm.; width 4.2 mm. Colorado (Boulder Co.) . . inflaticollis n. sp. 



Prothorax not inflated and always narrower than the elytral base, more 

 broadly rounded at the sides, ornamented as in undulatus 2 



2 External angle at the elytral truncature very obtuse and blunt; form 

 stouter than in undulatus 3 



External angle sharply marked and not blunt, the truncature straight, 

 oblique 4 



3 Color blackish-brown, black anteriorly, the legs and antennae piceous- 

 black, paler distally; head finely and densely but not deeply punctato- 

 rugulose, the converging frontal carinae more feeble than in any 

 other of the undulatus group, flatter and ill-defined; third antennal 

 joint not quite as long as the first; prothorax two-fifths wider than 

 long, parallel and almost evenly rounded at the sides, the fine 

 confused sculpture closer and stronger than in undulatus; elytra 

 nearly as in that species in form and ornamentation, the suture 



