CG NORTH AMERICAN 



rather narrow, and is truncated rather broadly at the tip, with the 

 side angles rounded, and the truncation slightly incurvate in the 

 middle. 



There is before me a specimen from Marquette, Michigan, which I 

 have referred to this species, although it presents a slightly different 

 facies, and is rather more slender. 



47. S. mendax n. sp. — Form rather slender. Pubescence as in indigens, 

 but longer and mure recumbent on the abdomen. Head rather robust, twice 

 as wide as long ; interocular surface moderately depressed, very finely, moder- 

 ately sparsely, and rather evenly punctate, interspaces very flat, rather 

 lustrous ; longitudinal elevation distinctly narrower than the lateral por- 

 tions, evenly and strongly convex, prominent, summit narrowly impunctate; 

 ocular lines meeting at nearly two lengths in advance ; first joint of antennae 

 black, second dark piceous-brown : fust joint of maxillary palpi and base of 

 the second pale testaceous, remainder piceous, third joint not greatly exceed- 

 ing the second in length. Prothorax widest at the middle, where it is three- 

 fourths as wide as the head, and about as wide as long ; sides thence equally 

 convergent anteriorly and posteriorly, and nearly straight ; anterior ami 

 posterior margins equal in length, the former strongly arcuate, the latter 

 straight; surface rather strongly tuberculate near each basal angle, trans- 

 versely and feebly impressed just behind the anterior margin, finely, rather 

 closely and somewhat irregularly punctate ; punctures more isolated at the 

 middle, interspaces highly polished, flattened ; canaliculation in the form of 

 a very faint and just perceptible longitudinal erosion. Elytra at base some- 

 what narrower than the head ; sides rather strongly divergent posteriorly, 

 slightly longer than the width at base and very feebly arcuate; together 

 roundly and rather strongly emarginate behind ; surface depressed, feebly 

 and broadly impressed along the suture, very closely punctate, punctures 

 growing more coarse ami confluent toward the apices. Abdominal segments 

 decreasing rather uniformly and gradually in width, first scarcely as wide as 

 the contiguous elytra; surface broadly convex, coarsely, closely, and evenly 

 punctulate, more finely so toward the tip ; transverse carinae tricuspid, mid- 

 dle cusps fine and aciculate, lateral shorter and bifurcate, Legs moderate, 

 rather pale fuscous ; first joint of the posterior tarsi three-fifths as long again 

 as the second, and somewhat shorter than the last, second joint nearly as 

 long as the third and fourth together. 



Male. — Unknown. 



Female. — Sixth ventral segment somewhat acutely and very evenly rounded 

 behind. 



Length 2.4 mm. 



Cambridge, Massachusetts, 1. 



The antennae are missing with exception of the first two joints. 



In this particular portion of the genus the specific differences 

 become very slight and somewhat uncertain; without previous study 

 and long-continued observation the species might be pronounced in 

 some instances identical. The specimens combined in eriensis and 



