164 JOHN L. LECONTE, M. D. 



5. T. iuterruptas. — Bostrichus interruptus Mannh. Bull. Mosc. 1S52, 357. 

 Alaska. This species is of the sauie size and form as the smaller 



race of T. pt'ni, but is more hairy, with the elytral strise composed of 

 more distant punctures, and the intervals marked with rows of punc- 

 tures but little smaller than those of the striae ; the posterior declivity 

 is just as in T. pini; the punctures of the hind part of the thorax 

 are rather deeper and more distant. The part of the head in front 

 of the eyes is longer and more finely punctured than in T. liini. 

 Long. 45 mm. 



6. T. tridens.=-B(js!!rie/iw.s tridens Mannh. Ijull. Mosc. 1852, 357. 



Alaska, one specimen. Of the same form and sculpture as T. in- 

 terruptus, but the head in front of the eyes is longer and more finely 

 punctured, and strongly retuse in the middle, with the anterior face of 

 the elevation somewhat impressed. The punctures of the striae of the 

 elytra are still more distant, and those of the intervals nearly as large 

 as those of the stria), though less numerous; the posterior excavation 

 is precisely as in T. {nfen-iiptus. 



7. T. avulsus Eichhoff, Berl. Ent. Zeitschr. 1867, 402. (Ante, p. 147.) 

 Southern States. Easily distinguished by its small size and by the 



less deeply excavated and less strongly toothed posterior declivity of 

 the elytra. 



C. — Sutures of the antennal club strongly curved, but not angukted. 



8. T. conoinnus. =^Bostrichus cone innus Mannh. Bull. Mose. 1852, 358. 

 Alaska, three specimens. A very distinct species, having the apical 



declivity of the elytra less deeply excavated, with the posterior margin 

 acute, but only slightly elevated, and armed with but three teeth each 

 side, of which the 3d is the longest. The elytra are punctured in a 

 confused manner, without distinct traces of striae. 



MICRACIS Lee. 

 The body in this genus is elongate, cylindrical, with the posterior 

 declivity of the elytra convex, and the suture prolonged into an acute 

 point. The club of the antennae is oval, compressed, finely pubescent, 

 with an elongated basal smooth spot, (the representative of the basal 

 joint as in Scolj/tus'), extending for more than half its length; the other 

 sutures form loops parallel with this smooth space ; the funiculus 'is 

 5-jointed, the 1st joint as long as the others united; the 2 — 5 are 

 closely connected, gradually becoming shorter and broader, forming a 

 conical mass. The scape of the antennse is broadly dilated and fringed 

 towards the extremity with very long hairs, almost as in some of the 

 genera allied to Platypus. 



