182 ACADEMY OF NATURAL SCIENCES 



and the third near the tip oblique and interrupted ; striae pro- 

 found, acute : interstitial lines armed with minute, elevated 

 points ; basal edge somewhat elevated, acute. 



Length three-twentieths of an inch. [323] 



SCOLYTUS Latr. 



1. S. 4-SPlNOSUS. — Black; elytra brown ; venter four-spined. 

 Inhabits Missouri. 



Head depressed above, lineated with minute, abbreviated, lon- 

 gitudinal lines; coronated with long, incurved, dull-yellowish 

 hairs on the margin , antennae pale rufous : thorax punctured, 

 black-brown : elytra reddish-brown, truncated, with impressed, 

 punctured striae, and an obsolete series of punctures on the in- 

 terstitial lines ; tip denticulated : venter obliquely truncated, 

 deep black, opaque, four-spined ; spines conic-acute, placed 3, 1, 

 the latter smaller. 



Length more than one-fifth of an inch. 



2. S. MUTicus. — Black, hairy; venter unarmed. 

 Inhabits Missouri. 



Body deep brownish-black, punctured, hairy; head, above de- 

 pressed, plane, lineated with minute longitudinal lines, and coro- 

 nated with incurved, yellowish hairs on the margin : antennae 

 pale rufous : elytra with numerous long hairs, truncate, and 

 slightly denticulated at tip : numerous punctured, hardly im- 

 pressed striae; venter obliquely truncated, mutic, furnished with 

 long hairs : posterior tibia with long hairs behind. 



Length from three-twentieths to one-fifth of an inch. [324] 

 Resembles the preceding, but is distinguished at once by the 

 mutic venter and the more numerous striations of the elytra. 



PLATYPUS Herbst, Latr. 



P. COMPOSITUS. — Reddish-brown ; each elytron with a termi- 

 nal, tridentate elongation. 



Inhabits Missouri. 



Body reddish-brown : eyes dusky : antennae, terminal joint di- 

 lated, compressed, oval, nearly as large as the eye ; elytra pro- 

 foundly striated; striae punctured; punctures subquadrate, ap- 

 proximate, slightly indented ; tip of each elytron with two small 

 longitudinal teeth and an elongated process, which is tridentate ; 



[Vol. III. 



