METAMORrHOSES OF ALASKA COLEOPTERA 373 



Labrum semicircular in form, with a row of bristles alonj]^ the anterior 

 margin. Antenme short, not exceeding the labrum, three-jointed; first 

 joint cylindrical, not quite twice as long as broad ; second more slender 

 and a little longer; third one-fourth as long as the second, more 

 slender, conical. Ocelli five, in two series; first series a group of 

 three, arranged in a triangle behind the antennae ; second series a 

 group of two, cephalo-ventrad of the first, the uppermost ocellus 

 hardly one-half as large as its companion ; jaws stout, subtriangular, 

 apex bluntly rounded ; inner margin with a blunt, faintly indicated 

 tooth near the middle ; articular condyle at the extreme outer angle. 

 Maxillae not exceeding the jaws ; cardo triangular, imperfectly chiti- 

 nized ; stipes twice as long as broad, with a few scattered hairs, pro- 

 duced apically into a triangular lacinial process which is nearly 

 straight outwardly and oblique on the internal margin, the latter being 

 densely set with set^ and hairs ; galea springing from the base of the 

 laciniar process and not greatly exceeding that structure, finger-shaped, 

 cui-ving inwardly, two-jointed, the basal joint obscurely indicated and 

 quadrangular in form, second joint ovate, bluntly rounded at apex, 

 which is crowned with a group of stout seta3. Mentum truncate in 

 front, broadening behind, anterior margin bearing four long hairs; 

 labial palpi short, slightly exceeding mentum, composed of two 

 joints, the basal joint large and fleshy, the apical joint small, conical ; 

 ligula wanting. 



Pronotum extremely convex, nearly as long as the mesonotum and 

 metanotum combined, densely and coarsely punctured, except a narrow 

 band on the posterior margin which is shining and longitudinally 

 striate, clothed with scattering, elongated hairs; lateral margins 

 strongly incui*ved, tapering to a rounded tip which reaches the coxae of 

 the anterior legs. Mesonotum short, transverse, obliquely truncate at 

 the lateral margins, which barely reach the coxae of the middle legs ; 

 transversely ridged ; punctured, but not so strongly as in the pro- 

 notum ; two transverse rows of hairs, blending in the middle, extend- 

 ing across the scute from side to side. Metanotum resembling the 

 mesonotum but with two transverse ridges instead of one, and with a 

 series of long hairs on each ridge, the series joining towards the sides 

 of the scute ; lateral margins broadly rounded, distant from the pos- 

 terior coxae ; venter with a small oval schlerite between the bases of 

 the posterior legs. 



Legs short, densely setate and hairy; coxae large, cylindrical ex- 

 cavated externally; femora and tibiie subequal, not as long as coxae; 

 tarsal claws simple. 



Proc. Wash. Acad. Sci., November, 1900. 



