PANTOMORUS OF AMERICA NORTH OF MEXICO ll 
ing the hind margins of the eyes across the dorsum of the head. 
The visible abdominal sternites are numbered 1 to 5, 1 being the third, 
and 5 the seventh morphological sternite. 
Unless otherwise stated, localities listed under Distribution are for 
specimens actually examined during this study,® most of them in the 
National Museum collection. 
KEY TO SUBGENERA OF PANTOMORUS NORTH OF MEXICO 
1. Mandible with a shallow sulcus, bounded each side by a blunt carina, 
from lower edge of scar to lower edge of mandible (fig. 2, K); 
support of deciduous piece short; scutellum densely, contrastingly 
clothed with white scales; elytral setae erect, and conspicuous 
throughout; elytron with white stripe from humerus posteriorly ; 
abdominal vestiture sparser medially; length usually more than 7.5 
mm.; male unknown________~_ Graphognathus, new subgenus (p. 11) 
Mandible without such a sulcus, though sometimes with a distinct carina 
(the inner carina of Graphognathus) (fig. 2, L); scutellum not so 
clothed (except in certain Phacepholis) ; elytron rarely with humeral 
white stripe; length usually less than 7.5 mm_________-____________ 2 
2. Setae on basal half of elytron prostrate or nearly so; pronotum punctate 
to shallowly rugose, scales not in radial clusters; scales on pronotum 
and elytra not metallic green; hind tibia slightly thickened apically, 
corbel plate narrow to obsolete, the dorsal comb as long as or longer 
than distal comb (fig. 2, G to I) ; basal portion of spermatheca rather 
slender and more or less produced (fig. 4, 4, B,C, Ff); male unknown. $3 
Elytral setae erect or suberect throughout; pronotum rugo-punetate or 
rugo-verrucose (sculpture often obscured by scales), often some of 
the scales in radial clusters (fig. 3, LZ); pronotal and elytral scales 
sometimes metallic green; hind tibia more thickened apically, corbel 
plate broader, the dorsal comb about half as long as distal comb 
(fig. 2, J) ; basal portion of spermatheca broad, not produced (fig. 4, 
GA) vimale“known= 22S) ee Ee Phacepholis Horn (p. 25). 
3. Eye moderately convex, the outer margin in dorsal view evenly curved 
(fig. 2, N); support of deciduous piece barely elevated; funicular 
segment 1 equal to or longer than 2; rostral groove not or hardly 
exceeding eyes (fig. 2, NV); basal margin of elytron not thickened ; 
elytral setae prostrate or subprostrate nearly throughout; sperma- 
theca slightly produced basally (fig. 4, #). 
Atrichonotus, new subgenus (p. 15). 
Bye strongly convex, the curvature of outer margin in dorsal view steeper 
posteriorly than anteriorly (fig. 2, 4, O); support of deciduous piece 
distinctly elevated ; funicular segment 2 longer than 1; rostral groove 
exceeding eyes (fig. 2, 47, O); basal margin of elytron usually, but 
not greatly, thickened; erect or slanting setae present on apical half 
of elytron ; spermatheca greatly produced basally (fig. 4, A, B, C). 
Asynonychus Crotch (p. 18). 
GRAPHOGNATHUS, new subgenus 
Scaly and setose, scales not metallic though sometimes, in part, faintly pinkish 
or iridescent. Head not constricted behind eyes, interocular distance equal to 
or Slightly greater than length of rostrum; rostal groove to opposite hind margin 
of eye; eye elliptical, moderately convex; rostrum short, stout; mandible stout, 
not toothed on mesal edge above, sulcus with a few scales and setae; scape 
reaching or slightly exceeding hind margin of eye, subequal in length to funicle 
without club, funicular segment 2 considerably longer than 1, 5+6+7 as long as 
club. Prothorax broadly, subevenly rounded at sides, base a little wider than 
apex, posterior margin in side view obtusely or scarcely angulate opposite elytral 
humerus; pronotum not, or feebly, rugose, median groove shallow to obsolescent, 
basal margin not, or faintly, bisinuate and with its declivity subvertical, only 
° The writer is indebted to E. T. Cresson, Jr., and Hugo Kahl for the loan of specimens, 
one to Elizabeth Smith for aid in the dissection of numerous specimens of Pantomorus 
eucoloma, 
