COLEOPTERA. 



S9 



20. S. strangulatus n. sp. (Fauvel MS.). — Form very slender. Pubes- 

 cence excessively short, fine, and sparse, setiform, cinereous. Head very 

 large, not twice as wide as long ; interocular surface three-fourths as wide 

 again as the eye, rather deeply excavated, finely and feebly punctured, 

 interspaces equal in width to the punctures, shining, minutely reticu- 

 lated ; longitudinal suleations closely approximate and distinct ; inter- 

 mediate surface very moderately and evenly convex ; ocular lines meeting 

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

 longer than width of head, dark piceous-brown throughout, club narrow : 

 third joint three-fourths as long again as the fourth, and nearly as long as 

 the fourth and fifth together, fourth and fifth equal, eighth one-half as long 

 as the seventh, joints of club increasing in length, last joint nearly as long 

 as the ninth and tenth together ; maxillary palpi long and slender, pale 

 testaceous throughout, last joint much elongated. Prothorax widest slightly 

 before the middle, where it is three-fourths as wide as the head, and one-fifth 

 narrower than long ; sides from the middle rather strongly convergent poste- 

 riorly and strongly sinuate ; anterior margin longer and more arcuate than 

 the posterior ; surface evenly convex, coarsely and very irregularly punc- 

 tate, interspaces at some spots equal in width to the punctures, somewhat 

 shining and very minutely reticulated, at others acute ; canaliculation 

 almost obsolete, one-half as long as the pronotum, terminating at equal dis- 

 tances from the anterior and posterior margins. Elytra at base scarcely 

 three-fourths as wide as the head ; sides very feebly divergent posteriorly, 

 slightly longer than width at base and rather strongly arcuate ; together 

 broadly and just perceptibly emarginate posteriorly; suture much shorter 

 than the pronotum ; surface even, somewhat depressed ; very coarsely, 

 closely, and somewhat irregularly punctured. Abdominal segments just 

 perceptibly decreasing in width posteriorly, first as wide as the contiguous 

 elytra ; border prominent ; surface very convex, coarsely, feebly, and dis- 

 tantly punctulate, moderately shining ; transverse carinae tricuspid, cusps 

 acute and aciculate, middle twice as long as the lateral. Legs very long and 

 slender, pale piceous-brown throughout ; first joint of posterior tarsi some- 

 what longer than twice the second, as long as the next three together, second 

 visibly longer than the third. 



Mule — Posterior edge of the fifth ventral segment deeply and broadly 

 emarginate in its middle third, notch four times as broad as deep, almost 

 transverse at the bottom, contiguous surface deeply and conically impressed 

 for one-half its length anteriorly, borders of the impression in the form of 

 very acute ridges, which terminate posteriorly in two long, very acute teeth, 

 projecting over and beyond the emargination ; sixth segment sinuate at apex, 

 sinus small, four times as wide as deep, and evenly rounded at the bottom. 



Female. — Sixth ventral segment evenly rounded behind throughout its 

 width. 



Length 3.1-3.4 mm. 



New York, 1 ; Detroit, Michigan, 5. 

 Very distinct and unmistakable in form. 



