COLEOPTEKA. 147 



together deeply emarginate behind ; suture slightly longer than the prono- 

 tuni ; surface feebly impressed along the suture, very evenly, rather finely, 

 very closely punctate ; interspaces not one-half as wide as the punctures, 

 slightly convex, polished. Abdominal segments decreasing uniformly and 

 very gradually in width, first distinctly narrower than the contiguous elytra ; 

 surface extremely coarsely and closely punctulate at the base, becoming finely 

 and much more distantly so toward the tip ; lateral border nearly obsolete, 

 except on the first segment ; transverse carinae tricuspid, middle cusps strong 

 and coarsely acuminate at tip, lateral much wider, more rounded and some- 

 what shorter. Legs long, rlavate, except the tips of the femora, which are 

 shaded with castaneous, femora robust, tibiae very long and slender, tarsi 

 slender, cylindrical ; first joint of the posterior more than twice as long as 

 the second, as long as the next three together, second distinctly longer than 

 the third, fourth very short, fifth equal in length to the third. 



Male. — Fifth ventral segment very feebly emarginate in its middle fifth at 

 apex, emargination rather angulate, about eight times as wide as deep, con- 

 tiguous surface narrowly and cylindrieally impressed for two-thirds its extent 

 anteriorly; sixth deeply and narrowly incised at apex, incisure one-half 

 deeper than wide, vertex nearly acute, sides slightly sinuate, angles rounded : 

 seventh segment deeply emarginate at apex, bottom of emargination broadly 

 transverse, teeth strong. 



Female. — Fifth segment slightly roughened or spongy in the middle of the 

 apical edge ; sixth obtusely rounded behind. 



Length 4.4 mm. 



Arizona, (Morrison), 18. 



This species is very closely allied to dispar, but differs decidedly 

 in the much closer and relatively finer sculpture, in the structure of 

 the male antennae — where the outer joints are shorter and thicker 

 than the seventh — and very markedly in size ; it appears to be abun- 

 dant. 



126. S. (M.) dispar n. sp. — Form very slender. Pubescence very sparse, 

 moderately long and fine, sub-recumbent, very pale piceo-plumbeous. Head 

 moderate, robust, much less than twice as wide as long ; interocular surface 

 twice as wide as the eye, moderately depressed ; longitudinal elevation very 

 narrow, rather feebly and evenly convex near the base, becoming extremely 

 narrow and cariniform anteriorly ; supra-antennal tuberculations round, very 

 moderate ; punctures coarse, evenly distributed, not coalescent ; interspaces 

 one-half as wide as the punctures ; ocular lines meeting at slightly less than 

 one length in advance ; antennae very long and slender, much longer than 

 the width of head, basal joint black, remainder pioeous-brown, club elon- 

 gated, very strong ; third joint one-half longer than the fourth, fourth shorter 

 than the fifth and just perceptibly longer than the sixth, sixth very slightly 

 longer than the seventh, eighth slightly more than one-half as long as the 

 seventh, seventh and eighth just perceptibly enlarged, joints of club much 

 elongated, tenth cylindrical and as long as the eleventh; maxillary palpi 

 very long and slender, pale rlavate throughout, third joint distinctly longer 



