[375] METAMORPHOSES OF ALASKA COLEOPTERA 197 



rounded in front, the anterior margin bearing three teeth of equal 

 length and size. Antenna three-fourths as long as the jaws ; three- 

 jointed; first and second joint of nearly equal size, the third shorter 

 and more slender with a small accessory article by its side. Ocelli on 

 the side of head close behind antennae. Mandibles of moderate size, 

 tapering, curving inward sharply from about the middle, apex acute, 

 inner margin with a moderately sized tooth close to the tip, the pos- 

 terior margin of this latter tooth with a row of five or six fine denta- 

 tions. Maxillae elongate, extending beyond the tips of the mandibles ; 

 stipes very large, inner margin straight, outer margin arcuate, two 

 and one-half times as long as broad, anterior portion of inner margin 

 densely hairy ; galea finger-shaped, uniarticulate, reaching to apex of 

 second joint of maxillary palpi ; maxillary palpi of moderate length, 

 composed of four successively smaller joints. Mentum six times as 

 long as broad, rounded at the anterior margin which bears in the 

 middle a single stout seta; labial palpi rather long, three-jointed, the 

 joints successively smaller. Pronotum squarish in outline, the chitinized 

 schlerite twice as broad as long ; mesothorax and metathorax shorter 

 than the prothorax, the dorsal schlerites delicately chitinized. Legs 

 short, with numerous short setae. Abdominal segments from the first 

 to eighth without distinctly chitinized schlerites, their lateral margins 

 bearing a few elongate hairs ; ninth abdominal segment slightly longer 

 than broad, anterior angles rounded, tapering posteriorly, terminal 

 processes simple ; sides of the schlerite with a distinctly raised, smooth 

 rim inclosing the somewhat depressed discal area within which is a 

 smooth and shining posterior emargination transversely oval almost 

 inclosed by the incurved apices of the terminal processes; sides with 

 a few long, slender hairs. Pupa white ; pronotal area greatly inflated, 

 arcuate at the sides ; wing-pads reaching to apex of first abdominal 

 segment ; anal segment bearing at its posterior extremity two sharp 

 styliform processes. Length 5 mm. 



Described from larvae and pupae found beneath stones along the 

 seashore. Popof Island, Alaska, July 10, 1899. 



CRYPTOHYPNUS LITTORALIS Esch. 

 [Plate XXV, figs, i and 2.] 



Larva reddish above, yellow beneath ; entirely corneous, eight times 

 as long as broad, convex above and below, tapering slightly at either 

 end. Length 15 mm. 



Head slightly narrower than the anterior margin of pronotum, 



