128 NORTH AMERICAN 



tenth and eleventh joints longer and thicker than the ninth, equal, of a dark 

 fuscous tint ; first joint of the maxillary palpi dark Aavo-testaceous, second 

 and third dark blackish-fuscous. Prothorax short and robust, three-fourths 

 as lmig again as the head, widest before the middle, where it is nearly as 

 wide as long ; sides thence converging very gradually and very feebly sinuate ; 

 posterior margin slightly narrower and more arcuate than the anterior ; sur- 

 face evenly convex, rather finely punctate ; interspaces about equal in width 

 to the punctures. Elytra at base equal in width to the head ; together rather 

 deeply emarginate at the base, very broadly and feebly so behind ; sides but 

 slightly divergent, arcuate; suture one-fifth as long again as the pronotum ; 

 surface rather convex; punctures rather fine, impressed, setigerous ; inter- 

 spaces slightly greater than the width of the punctures, highly polished. 

 Abdominal segments decreasing very gradually in width, first almost as wide 

 as the elytra : surface very sparsely and finely punctate, shining ; bonier of 

 first four segments moderate ; transverse carinae not cusped. Legs piceous- 

 black, tarsi a little paler, rather robust ; first joint of the posterior one-half 

 as long again as the second. Under surface black, abdomen very finely and 

 rather closely punctate. 



Mule. — Posterior edge of the fifth ventral segment very feebly sinuate, 

 sinus one-third as wide as the segment, surface evenly convex ; sixth sinuate 

 at apex, sinus one-half as wide as the segment, twice as wide as deep, con- 

 tiguous surface feebly and longitudinally impressed. 



Female. — Sixth segment broadly and evenly rounded behind. 



Length 2.8 mm. 



California, 1 ; British Columbia, 15. 



107. S. terricola n. sp. — Form rather robust. Pubescence erect, rather 

 short, fine, moderately abundant, cinereous. Head scarcely twice as wide as 

 long ; interocular surface a little more than twice as wide as the eye; nearly 

 flat, very closely, finely, and regularly punctate ; punctures variolate ; nearly 

 equally trilobed by the shallow suh-ations ; ocular lines meeting at nearly 

 three lengths in advance ; antennae slender, dark reddish-black, coarsely 

 setose, third joint one- third as long again as the fourth, joints four and five 

 equal in length ; first joint of maxillary palpi dark testaceous, second and 

 third black. Prothorax widest slightly before the middle, where it is five- 

 sixths as wide as the head, and almost- as wide as long ; sides thence con- 

 vergent posteriorly and straight ; posterior margin slightly shorter than the 

 anterior ; equally, feebly arcuate ; surface evenly convex, closely, somewhat 

 evenly and finely punctate ; punctures sub-variolate ; interspaces narrower, 

 moderately lustrous. Elytra at base wider than the head ; sides almost im- 

 perceptibly divergent posteriorly, and very slightly arcuate ; together broadly 

 emarginate anteriorly, and very broadly and more strongly so posteriorly ; 

 suture nearly one-fourth as long again as the pronotum ; surface evenly con- 

 vex, rather evenly and finely punctate ; punctures feebly impressed, some- 

 what wider than the interspaces, which are lustrous. First three abdominal 

 segments as wide as the elytra at base ; border strong ; surface rather flat, 

 and very finely punctulate ; transverse carinae not cusped. Legs moderate 

 and rather slender, piceous-black ; first joint of the posterior tarsi two-thirds 



