192 NORTH AMERICAN 



the distal half, and in the very strong punctuation of the under surface 

 of the abdomen in the males. 



Dedicated to Mr. H. G. Hubbard, to whose scientific collecting in 

 this portion of the country, a great deal of the existing material is due. 



36. A. laetlllllS n. sp. — Form rather slender, sub-cylindrical. Pubes- 

 cence moderate in length, sub-recumbent, excessively .sparse, plumbeo-cine- 

 reous. Head moderate, twice as wide as long ; interocular surface flat, twice 

 as wide as the eye ; longitudinal elevation narrower than the lateral portions, 

 very strongly and evenly convex, entirely impunctate and very highly 

 polished; sulcations convergent anteriorly, strong; lateral lobes convex 

 with a very few widely separated, small, deeply impressed punctures ; inter- 

 spaces very wide, convex, and highly polished ; supra-antennal tubercula- 

 tions very prominent, highly polished, and impunctate, separated from the 

 eyes by short sulcations ; ocular lines meeting at one length in advance ; 

 antennae longer than the width of head, very pale reddish-testaceous 

 throughout, slender, club moderate; third joint one-third longer than the 

 fourth, fourth and fifth sub-equal, sixth much longer and very slightly 

 narrower than the seventh, eighth distinctly shorter than the seventh, equal 

 to it in width, joints of club increasing in length, elongated, sub-cylindrical, 

 very sparsely pubescent; maxillary palpi elongated, pale pieeo-testaceous 

 throughout. Prothorax widest at the middle, where it is four-fifths as wide 

 as the head and slightly narrower than long; sides thence very feebly con- 

 vergent posteriorly and feebly sinuate ; anterior margin slightly shorter and 

 more arcuate than the posterior ; surface evenly convex, very sparsely and 

 unequally punctate; punctures very deeply impressed, round ; interspaces 

 convex and extremely highly polisljed. Elytra at base very slightly wider 

 than the Bead ; sides very feebly divergent posteriorly, as long as the width 

 at base, very strongly and evenly arcuate ; together broadly and rather 

 strongly emarginate behind; suture one-sixth longer than the pronotum ; 

 surface strongly convex, very feebly and narrowly impressed on the suture 

 at the base ; sparsely, coarsely, and somewhat evenly punctate; punctures 

 round, widely isolated, very deeply impressed ; interspaces very convex, 

 wider than the punctures, highly polished. Abdominal segments cylindri- 

 cal, decreasing uniformly and rapidly in width, first much narrower than the 

 contiguous elytra; surface very highly polished, very finely and sparsely 

 punctulate ; border obsolete, except along the first segment ; transverse 

 carinae tridentate, teeth \fry broadly rounded, short and rudimentary. 

 Legs slender, piceous-brown ; first joint of the posterior tarsi distinctly longer 

 than the next two together ; fourth joints deeply bilobed, lobes slender. 



Male. — Sixth ventral segment very narrow, truncate at tip, where it is 

 bilobed, cusp small but distinct, acute. 



Female. — Sixth segment very broadly and evenly rounded behind. 



Length 3.0-3.1 mm. 



California (S. Buenaventura), 0. 



The under surface of the abdomen is very sparsely punctate, more 

 densely so on the last two segments ; extremely highly polished. 



