NORTH AMERICAN COLEOPTERA. 17 



and may therefore be dismissed from further consideration. In all 

 the species of Deltometopus the antennal groove is distinctly wider 

 behind. In rufipes the groove is fully as wide as the small pro- 

 pleural triangle and not wider behind but, if anything, widest oppo- 

 site the middle of the propleural triangle. The width of the groove 

 is such that the outer apical angle of the prosternum is cut off by it. 

 Two specimens, Canada. 



D ROM .1:01.1 S Kies. 

 Form slender, subcylindrical, usually narrower posteriorly ; antennte filiform, 

 or very feebly serrate, usually more slender to the tip ; head convex, deeply in- 

 serted . eyes convex, not encroaching upon the antennal groove ; clypeus narrowed 

 at base, inflexed, the apical margin usually truncate at middle, sinuate each side ; 

 mandibles robust, the exposed surface large and rugose ; prothorax variable in 

 form, usually not longer than wide; prosternal sutures distinct, usually deep, 

 slightly divergent, the propleural triangle always longer than wide at base, the 

 antennal gi-ooves narrow, parallel, open behind, usually deep and sharply limited, 

 rarely (hasalis and nitens) shallow and not limited internally; metasternal epis- 

 terna parallel, the epimera invisible ; hind coxal plates gradually wider inter- 

 nally ; legs moderate ; hind tarsi with the first joint variable, at least as long as 

 the next three joints, the fourth excavate emarginate above and slightly lobed 

 beneath ; claws simple. 



ThLs genus and Fornax are very closely related, the only constant 

 difference being that the larger eyes of the latter narrow the antennal 

 groove at its entrance on the head. This character is, however, diffi- 

 cult to realize at times, so that I have doubted whether salsus should 

 really be retained in the present genus. 



This genus Ls represented on both sides of the continent, the sj^ecies 

 are as follows : 



Interocular carina entire, extending across the base of the clypeus. 



ealirorniciis. 



Interocular carina interrupted at middle 2. 



2. — Clypeus at base half as broad as the apical margin 3. 



Clypeus at base very narrow 8. 



3. — Body above brown 4. 



Body above black 5. 



4.— Mesopleura- punctured at base and externally (second joint of antennae 



shorter than the fourth Bonv.) sejunctus. 



Mesopleurae punctured over the entire surface ; second joint of antenuaj 



longer than the fourth i^alsus. 



5. — Marginal grooves of thorax shallow, not sharply limited internally 6. 



Marginal grooves deep, sharply limited 7. 



6. — Propleural triangle fully twice as long as wide; upper surface shining, 



pubescence very sparse and inconspicuous uitens. 



Propleural triangle not twice as long as wide ; upper surface opaque, elytra 

 with paler pubescence at basal third basalis 



TRANS. AMER. ENT. SOC. (3; JANUARY, 1886. 



