146 NORTH AMERICAN 



A very distinct form ; it is distinguishable at a glance by its very 

 long elytra. 



Subgenus MUTINUS nora. nov. 



The two following species are separated as a subgenus under the 

 above name, on account of certain peculiarities in the antennae. 

 These organs in the male are long and slender, and have the ninth 

 and tenth joints no thicker than the seventb, or but very slightly 

 more robust ; the terminal joint is equal in thickness, but is much 

 shorter than the penultimate. In the female these characters are not 

 striking, the club being of nearly normal formation, except that the 

 last joint is about equal in length to the tenth. The general form of 

 the body is slender and sub-cylindrical, and the abdomen is not mar- 

 gined laterally. The integuments are highly polished. The tarsi are 

 normal, the last joint being very short, and the first very long. 



The only species thus far discovered within our territory may be 

 distinguished as follows : — 



Large species, 4.4 mm. in length ; punctuation close. Arizona. ..125. gilae. 

 Smaller species, 3.0-3.8 mm. ; punctuation much more distant. Massachu- 

 setts to Texas 12(3. dispar. 



125. S. (IW.) gilae n. sp. — Form moderately slender. Pubescence sparse, 



short, line, piceous, inconspicuous. Head robust, much less than twice as 

 wide as long; interocular surface strongly depressed, twice as wide as the 

 eye ; longitudinal elevation very narrow, strongly convex, impunctate, and 

 highly polished ; punctures moderate in size, rounded, rather evenly dis- 

 tributed ; and very closely crowded ; ocular lines meeting at one-half a length 

 in advance, strongly curvate anteriorly; antennae one-third longer than the 

 width of head, slender, basal joint black, remainder dark piceo-testaceous, 

 club very slender ; third joint very long, one-half longer than the fourth, 

 fourth slightly shorter than the fifth, sixth distinctly shorter and more 

 slender than the seventh, eighth and ninth equal in length, the latter dis- 

 tinctly thicker and slightly more robust than the seventh, tenth joint just 

 perceptibly shorter than the ninth, cylindrical, and distinctly thicker, last 

 joint three-fourths as long as the tenth, slightly compressed ; maxillary palpi 

 very lung and slender, translucent, very pale flavate throughout, second and 

 third joints sub-equal in length, fourth nearly as broad as long, very minute, 

 rounded at tip. Prothorax widest at two-thirds the length posteriorly, where 

 it is distinctly narrower than long : sides thence very feebly convergent behind 

 and strongly sinuate ; anterior margin slightly shorter and more arcuate than 

 the posterior ; surface evenly convex, deeply, very closely, and evenly punc- 

 tate ; punctures elongated transversely; interspaces very convex, polished. 

 Elytra at base as wide as the head ; sides very feebly divergent posteriorly 

 slightly longer than the width at base, strongly and almost evenly arcuate ; 



