COLEOPTERA. ( .M) 



impressed, close, very confusedly coalescent. Elytra at base much narrower 

 than the head ; sides strongly divergent posteriorly, longer than the width 

 at base and moderately arcuate ; together very broadly, roundly, and rather 

 strongly emarginate behind ; suture very slightly shorter than the pronotum ; 

 surface depressed, nearly even, rather finely, closely, roughly, and very con- 

 fusedly sculptured ; channels not distinctly traceable. Abdominal segments 

 arcuately and just perceptibly decreasing in width, first slightly wider than 

 the contiguous elytra ; surface broadly and feebly convex ; very coarsely, 

 rather distantly and evenly punctulate ; transverse carinae tricuspid, cusps 

 rather long, equal in length, middle ones becoming finely acuminate, lateral 

 broad, decreasing in width toward tip, where they are narrowly truncate and 

 confluent with the general surface. Legs short and slender, dark blackish- 

 fuscous above, slightly paler beneath ; first joint of the posterior tarsi scarcely 

 one-fourth as long again as the second, very much shorter than the fifth, 

 second much longer than the third, third and fourth of nearly equal length ; 

 the first two joints are much more robust than the third and fourth ; the fifth 

 is slightly clavate. 



Male. — Fifth ventral segment scarcely modified, with the exception of a 

 very faint flattening along its middle fourth ; sixth segment broadly and 

 feebly bilobed at apex, cusp very feebly and narrowly rounded, arms nearly 

 straight ; seventh very feebly sinuate at tip, without trace of either terminal 

 teeth or lateral setae. 



Female. — Unknown. 



Length 3.0 mm. 



Cambridge, Massachusetts, 1. 



I am quite sure of the sex of the above type specimen, although 

 the characters of the sixth segment as given, are rather those of a 

 female in types, the males of which are provided with very strikin<>- 

 sexual characters. The species is very distinct, and could not fail of 

 instant recognition by the unaided eye, even when among a large 

 number of other species, with sole exception of the preceding form, 

 to which it bears an illusive resemblance. They may be distinguished 

 by the more robust form and coarser sculpture of gravidus, and also 

 by differences in the sexual characters. 



78. S. ailimatlis n. sp. — Form rather slender. Pubescence short, sub- 

 recumbent, rather close, fine, pale fulvo-cinereous. Head robust, scarcely 

 twice as wide as long ; interocular surface feebly depressed, slightly more 

 than twice as wide as the eye ; longitudinal elevation narrower than the 

 lateral portions, evenly and very strongly convex, conspicuous ; punctures 

 rather fine, closely crowded, and oblong near the eyes, more sparse along 

 the median line ; ocular lines meeting at two-thirds of a length in advance ; 

 antennae as long as the width of head, slender, club small, basal joint black, 

 second slightly paler, remainder pale piceous-brown ; third joint one-half as 

 long again as the fourth, fourth and fifth equal in length, sixth and seventh 

 very slightly shorter, equal in length, the latter thicker and oval, eighth 



