TRIBE I. TANYMECINI. 117 



c. Cheeks emarginate behind the mandibles; elytral stria? nine, rarely 

 ten, the tenth usually united with the ninth; tarsal claws free, 

 except in ApJirastus. Tribe II. CYPHINI, p. 121. 



cc. Cheeks not or very feebly emarginate; elytral stria? ten. 



(I. Beak longer than head, the antennal grooves long; tarsal claws 



free; head not prolonged behind the eyes; corbels of hind tibiae 



cavernous. Tribe III. EVOTINI, p. 128. 



del. Beak not longer than head, the grooves short; tarsal claws connate; 



head prolonged behind the eyes; corbels of hind tibiae open. 



Tribe IV. PHYLLOBIINI, p. 128. 



aa. Thorax with large ocular lobes; mentum small, retracted; eyes trans- 

 versely oval. Tribe V. PROMECOPINI, p. 133. 

 Tribe I. TANYMECINI. 



Our members of this group have the beak of moderate length, 

 its sides subparallel aud tip emarginate; antennal grooves linear, 

 rather deep, curved and passing beneath the eyes; scape moder- 

 ately long, reaching at least the hind margin of eyes; scutellum 

 distinct; second ventral segment longer than third and fourth 

 together and separated from the first by a curved suture; tarsal 

 claws free. Three of the four genera are represented in our ter- 

 ritory. 



KEY TO EASTERN GENERA OF TANYMECINI. 



o. Front coxae contiguous; front femora not longer and stouter than the 



others. 



b. Thorax feebly lobed behind the eyes, its base bisinuate; eyes trans- 

 versely oval, pointed beneath. XV. PACHN^EUS. 

 bb. Thorax not lobed, its base truncate; eyes longitudinally oval; front 

 tibiae not toothed within. XVI. TANYMECUS. 

 aa. Front coxa? distant; front femora larger than the others, their tibia? 

 toothed within. XVII. PANDELETEIUS. 



XV. PACHN^BUS Schonh., 182G. (Gr., "pruinose.") 



Beak as long as the head, antennas inserted near its middle, 

 scape reaching hind margin of eye, first two joints of funicle 

 longer than the others, second longer than first, 3 7 subequal; 

 elytra w r ider at base than thorax; humeri oblique. Two large 

 and handsome species occur in the South Atlantic States. 



KEY TO SPECIES OF PACHN.EUS. 



a. Color pale blue or greenish-blue; elytra strongly bisinuate at base, 

 the middle of each produced forward on the thorax. 151 OPALUS. 

 aa. Color pale bluish-white; elytra feebly bisinuate, not produced for- 

 ward at base. 152. DISTANS. 



151 (8309). PACHN^US OPALUS Oliv., 1807, 339. 



Oblong-oval. Piceous; everywhere densely covered with pale blue scales 

 having a faint cupreous lustre; median line and sides of thorax paler. Beak 

 with a fine median carina. Thorax one-third wider at base than long, sides 

 feebly curved to the narrower apex, base bisinuate, apex feebly lobed at 



