192 Journal New York Entomological Society. [^'"i- ^^vi. 



Fort Yuma, Arizona, type in coll. Hubbard and Scbwarz, U. S. 

 Nat. Museum. 



An easily known species by its decided elytral maculation. The 

 elytra is also relatively shorter than in our other species. The anten- 

 nae are apparently eleven-jointed, which will put this species with 

 fissiccps Fall and punctatum Van Dyke in the subgenus Monesoma. 

 N. attenuatum Van Dyke which has ten -jointed anteniicT belongs in 

 the subgenus Nemosoma s. st. 



Cylidrella championi Wickh. 



This species is described from Colorado but occurs also in Arizona. 



Corticotomus caviceps Fall and laeviventris Casey. 



After examining a large series from different localities including 

 California, Arizona, New Mexico, Colorado, etc., I can't do otherwise 

 than unite the two. The excavation of the head is very variable in 

 the large series before me. In some it is very pronounced, in others 

 less so and some of the specimens have no indication of it: these latter 

 I take to be the females. Similar variations occur in cyliiidricits but 

 not as strongly pronounced as in caviceps. The punctuation of elytra 

 is also variable, in some specimens very faint in others relatively 

 strong. 



Corticotomus depressus new species. 



Elongate depressed, color uniformly brown or piceous, legs, antennae and 

 palpi paler. 



Head flat in front, relatively coarsely punctate, punctures on the disk well 

 separated but more closely placed at sides near the eyes. Prothorax about as 

 long as wide; sides slightly arcuate; at apex not wider than the head; surface 

 relatively very densely and coarsely punctate, the punctures mostly separated 

 by less than their own diameter. Elytra very feebly arcuate at sides ; punc- 

 tures of the regular series coarse, close and deeply impressed but gradually 

 finer towards apex ; intervals narrow, more or less uniseriately punctate, punc- 

 tures very distinct and moderately coarse. Underside coarsely punctate, punc- 

 tures on prosternum moderately close, those on metasternum very dense and 

 separated by less than their own diameter ; punctures on ventral segments of 

 abdomen moderately close. Length 4 mm. ; width i mm. 



Alabama (Loding, type) ; Pennsylvania (Horn collection, teste 



Liebeck) ; New Jersey (Liebeck) ; Lakehurst, N. J. (Engelhardt). 



This species is more depressed and much more coarsely punctate 



