Casey — A Revision of the American Paederini. 59 
wholly out of place in the European catalogues, — and the 
Lithochares connect it with the Medones, although there is 
evidently a closer relationship between the last two named 
than between the Paederi and Lithochares, as shown by gen- 
eral habitus. Our species will form three closely allied 
genera. The four genera represented before me may be dis- 
tinguished as follows: — 
Head large, more or less quadrate and broadly truncate at base; prothorax 
very broad and strongly rounded at the sides anteriorly, strongly nar- 
rowed thence to the base; integuments coarsely and sparsely punctate 
and pubescent; fourth tarsal joint strongly bilobed; gular sutures dis- 
tinct, moderately separated and impressed. General in distribution. 
[= Paederomorphus Gaut.].... sees cecescccce reve cececcccees PACHErUS 
Head relatively small, strongly narrowed behind the eyes and narrowly 
truncate or rounded at base, the prothorax relatively much smaller and 
MOTE EVENLY OVAL. . cece ccccc ccs seccsvcccceccccccrcercsccssesstescee Oo 
2 — Punctures and pubescence coarse and sparse, the abdomen always very 
sparsely punctulate, with the dorsal segments more or less feebly, trans- 
versely impressed at base; gular sutures gradually converging and 
most narrowly — though somewhat widely — separated behind the 
middle of the post-oral surface, always very feeble and unimpressed and 
sometimes. snbobliterated .. oo ve seccccccc-scdesowecsdsiscadccaccecce O 
Punctures and pubescence finer and close-set, the abdominal segments 
strongly, transversely impressed at base; first abdominal segment 
WICHOUL DAGRL CALING si 'oc onda ses ebced Kécsmessscvesecwececcaseeepesse & 
3 — Eyes moderate in size; abdomen obtuse; fourth tarsal joint rather 
wide and strongly bilobed; head and last two ventrals always black, 
the elytra invariably dark steel-blue in color. Entire United 
SURES Hadas 4h web 6s Wetec ese h Chee kaa bheeue Cheese cece cena SOOT 
Eyes large; abdomen gradually narrowed toward tip; fourth tarsal joint 
very narrowly bilobed; color testaceous nearly throughont. Sonoran 
TEQIONS oe creer ececescccscvccccescceccesescesesescoses LOUCOPACdErUS 
4—Kyes moderate in size; fourth tarsal joint not wider than the preceding, 
small and slightly bilobed; gular sutures becoming almost completely 
confluent posteriorly. Europe. .c.ceseee seeecccecccceeee* PaCderidus 
The beetles of the present group are more highly and con- 
spicuously colored than any others of the tribe, and, being at 
the same time of moderately large size, especially in the 
tropics, they have received considerable attention from sys- 
tematic writers. Excepting the warmer parts of the new 
world, our representatives are less numerous and less diver- 
sified than those of Europe —an exceptional case in the 
Paederini. 
