[377] METAMORPHOSES OF ALASKA COLEOPTERA 199 



Head rounded, broader than long, anterior margin broadly truncate, 

 posterior angles rounded, dorsal surface flattened, shining, frontal mar- 

 gin but slightly thickened or coriaceous, frontal angles reduced to small 

 tubercles. Ocelli five, in two series; first series consisting of three 

 ocelli arranged close together in a transverse line on the lateral margin 

 of the head behind the antennae; second series of two ocelli, situated 

 a short distance behind the first set. Clypeus transverse, trapezoidal, 

 four times as broad as long. Labrum semicircular, twice as broad as 

 long with a dense fringe of fine hairs on the anterior margin. Man 

 dibles triangular in outline, apex acute with a prominent rectangular 

 tooth near tip on inner margin ; articular condyle close to the extreme 

 outer angle of the base. Antennae minute, not exceeding the clypeus, 

 three-jointed ; first joint cylindrical, twice as long as broad ; second 

 one-third the length of first, slightly narrower, third joint minute, 

 conical, with a stout seta at apex. Maxilla reaching nearly to the 

 apex of mandible ; cardo as large as stipes, irregularly triangular in 

 outline ; stipes produced apically to form a lobate galear process, which 

 is thickly setate on its inner margin; maxillary palpi three-jointed, 

 basal joint stout, the following joints successively shorter and more 

 slender. Mentum broadly rounded at the tip, which is finely pubes- 

 cent, outer margin bearing three setae near the center ; palpi widely 

 separated at base, three- jointed, first and second joints equal in length, 

 third small, conical. 



Pronotum transverse, two and one-third times as broad as long, 

 angles broadly rounded, dorsal surface flattened. Mesonotum and 

 metanotum transverse, short, diminishing in width. Legs a little 

 longer than the maxillae ; coxa? short, stout ; femora and tibiae cylin- 

 drical, subequal in length, the tibiae more slender ; claw simple. Ab- 

 dominal segments, except eighth and ninth, bearing both dorsally and 

 ventral ly a pair of locomotor callosities. 



Described from larvae found in the stumps of decaying alder bushes 

 on Popof Island, Alaska, July 10, 1899. This is the only known 

 American representative of this genus. 



CHRYSOMELA SUBSULCATA Mann. 

 [Plate XXVI, figs. 1-7.] 



Larva pink, shading into red on the dorsal surface, pronotum brown, 

 head and legs black; dorsal surface delicately granulate and with 

 numerous minute tubercles each surrounded by a small spot of brown ; 

 form stout, almost semicircular in outline when reviewed from the 



