Casey — A Revision of the American Paederini. 189 
the preceding species; prothorax as long as wide, the sides feebly 
arcuate, just visibly convergent from apex to base, the angles moder- 
ately rounded; elytra relatively small, as long as wide, about equal in 
width and length to the prothorax, the sides very slightly diverging 
from the base. Length 2.8 mm.; width 0.6 mm. Alabama (Eufaula). 
alabamae nu. sp. 
The sexual characters are simple, the male, as in Caloder- 
ma, having a small rounded or more or less angulate sinus at 
the tip of the sixth segment, becoming decidedly larger and 
triangular in alabamae, and the anterior tarsi are more 
strongly dilated in that sex. Some of the Massachusetts 
specimens, described as thoracicum in the table, were sent to 
me by M. Sallé, under the name obsoletum Nord., and I have 
also taken it myself at Taunton, Mass. It differs from the 
true obsoletum, as represented by some Dalmatian examples 
sent me by Mr. Reitter, in its smaller size, relatively much 
larger prothorax and smaller elytra and in the deeper sinus 
of the sixth ventral of the male. The western capitulum re- 
sembles obsoletum much more closely in size and form, but 
has a deeper male sinus and relatively larger prothorax. The 
true obsoletum does not therefore occur in America, and its 
insertion in our catalogue is a result of careless and super- 
ficial comparative study, as has been the case in many other 
instances. Most of our faunistic catalogues are diminished 
considerably in value from this cause. 
Lena Csy. 
Although evidently allied to Pseudomedon by the structure 
of the labrum, gular sutures and hind tarsi, this genus de- 
parts widely in general facies, sculpture, in antennal structure 
and in its undilated anterior tarsi. The labrum is completely 
devoid of any trace of teeth but has a well developed median 
notch; the gular sutures are moderately separated at the 
front of the under surface of the head but thence gradually 
diverge widely to the base. The antennae are somewhat as 
in Medonella, being very short, with the third joint shorter 
and narrower than the second, the shaft gradually becoming 
notably thicker or clavate toward tip. Theposterior tarsi are 
