METAMORPHOSES OF ALASKA COLEOPTERA 377 



Head rouiulctl, 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 antenna}; 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. Antenna 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 setce 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 ; coxse 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 

 ventrally a pair of locomotor callosities. 



Described from larvae found in the stumps of decaying alder bushes 

 on Popof Island, Alaska, Jul}'^ 10, 1S99. 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 



