NORTH AMERICAN COLEOPTJORA . 
285 
Tliorax not grooved : elytra not ornate, with pubescent spots pygidium 
subacute |»iil<*liellii!^. 
Suture between tbe first two ventrals entirely obliterated at the sides 18. 
18. — Scutelluin not carinate ; pygidium feebly carinate It). 
Scutellum transversely carinate 20. 
19. — Prosternal lobe truncate or emarginate. 
Prosternum at tip obtusely rounded ; elytra at tip not distinctly serrulate ; 
thorax with deep median impression oboliiiii!^. 
Prosternum at tip emarginate; elytra at tip not serrulate; last ventral 
feebly serrulate: tboracic depression feeble iniiticii!>i. 
Prosternal lobe rounded, the tip squarely truncate ; elytra scarcely serrulate 
at tip; no thoracic depression, hind angles feebly carinate. 
jacobin II )!«. 
20 . 
21 .- 
23. 
24.— 
20 .- 
-Elytra with pubescent spaces 21. 
Elytra without pubescent spaces : prosternal lobe truncate, or feebly emar- 
ginate; claws of front tarsi of male nearly bifid |>olitu!^. 
-Prosternal lobe deeply emarginate 22. 
Prosternal lobe entire falla.Y. 
First joint of hind tarsi longer than half the tibia; legs and antenuai 
slender obMoletogiitlatiis. 
First joint of hind tarsi not as long as half the tibia; legs and antennse of 
usual form 23. 
-Hind angles of thorax sharply carinate, the median thoracic depressions 
feeble scitiilii»i. 
Hind angles of thorax without trace of carina, disc convex, without de- 
pression ; entire apical third of elytra with whitish pubescence. 
oriiatiiliiK. 
Hind angles of thorax not carinate, disc convex, without depression ; elytra 
with an indistinct subsutural vitta ; second and third ventral seg- 
ments slightly prolonged at middle over the following segments. 
Pi. viii, figs. 21, 22 TeiitraliM. 
Hind angles of thorax not all carinate 25. 
Hind angles of thorax distinctly carinate 28. 
Upper surface with pubescent spots or simces 26. 
Upper surface without juibescent spaces 27. 
-Thoi'ax convex, with at most a feeble median depression, sides scarcely 
explanate. 
Thorax simply punctate, no median depression, sides clothed with white 
pubescence; on each elytron a white vitte blamliis. 
Thorax very roughly strigose, a feeble median impression, not pubescent 
at sides; elytra with three faint spots each side abjeotiis. 
Thorax slightly depressed, the sides slightly explanate, surface distantly 
strigose, a moderately deep and broad median impression ; elytral 
pubescence forming a distinct design i^iiboiiict iim. 
27. — Elytra vaguely costate ; thorax transversely strigose and punctate; lower 
angle of eye acute ; scutellum carinate liiitilliiM. 
Elytra not at all costate; thorax very obliquely strigose, with a reticulate 
appearance, not punctate; lower angle of eye rounded, scutellum 
not ca ri na te a b*i» t oi’M ii<!«. 
