Casey — A Revision of the American Paederinit. . 91 
specimens, in which the coloration of the elytra is perfectly 
constant, except in one individual, where the red is replaced 
by a piceous-black; as the other specimens are constant, this 
dark coloration may be accidental. | 
There is no group of species known to me, showing more 
plainly the subgeneric value of types of male secondary sexual 
characters, than these components of Lathrobium, for we 
have successions of what are without doubt distinct, though 
closely related, species, having throughout the same type of 
sexual modifications, which types are abruptly limited in ex- 
tent and without intermediates, as shown by the above table. 
The name simplex was replaced by fauveli by M. Duvivier, 
(Cat. 1883) on the ground of preoccupation, but I am by no 
means certain that the older stmplex is really'’a Lathrobium, 
and therefore have not made the change of name. 
There are four described species of Lathrobium which are 
not before me at present; these are appended below with 
‘short descriptions which I drew up some years ago from the 
original unique types. They are all very distinct species and 
will undoubtedly have to be removed from the restricted 
genus Lathrobium, but having failed to record any observa- 
tions upon the elytral flanks, gular sutures or structure of the 
hind tarsi, I am unable to dispose of them among the other 
genera at present, and indeed some of them are so ‘isolated 
as to indicate new genera. For the present however they 
may be attached to Lathrobium:— 
Form moderately slender, parallel, head gradually and slightly narrowed 
behind the eyes to the neck, which is broad, the surface coarsely and 
remotely punctate; antennae not very thick, as long as the head and 
prothorax, the latter about as long as wide, equal in width to the head, 
the punctures coarse, sparse and rather feebly impressed; elytra about 
as long and wide as the prothorax, the punctures very coarse, not close- 
set and rather feebly impressed, arranged in series throughout; ab- 
domen finely and sparsely punctulate. Male having a feeble, transversely 
oval medial impression on the fourth ventral — possibly accidental, — 
the fifth very minutely, feebly sinuate and extremely feebly impressed 
at apex, the sixth with a broad angular emargination, occupying the 
entire apex and at least five times as wide as deep. Length 5.7 mm.; 
width 0.9mm. North Carolina...........ee0.+0+:-+eee-Seriatum Lec. 
Form subparallel and rather stout, convex, dark rufo-testaceous, the head 
blackish; elytra rufous, with a large median blackish cloud extending 
