LeConte.] 612 [April 18, 
of Dr. Horn has short elytra, much as in the 9 of Photinus 
(Gynaptera) scintillans. This insect has a very strong resem- 
blance to Lamprohiza splendidula of Europe, but is generi- 
eally distinct by the longer antenns, and by the small acicu- 
lar twelfth joint of those organs. Specifically, it differs by the 
dise of the prothorax being smooth, the transparent spots 
more oval, not curved, and by the hind angles of the pro- 
thorax being greatly retracted. 
Hadrobregmaus limearis ec. Pr. Ac. Nat. Se. Phila. 1865, 232. 
A very singular series of this insect was collected at Detroit. In two in- 
dividuals, both antenne have ten joints, that is to say there are five small 
joints between the rounded second joint and the first of the elongated joints. 
In one specimen the right antenne has eleven, while the left has ten joints ; 
{this difference is produced by the division of the fourth joint into two 
parts. In another specimen the right antenna has ten, while the left has 
but nine joints ; and it isagain the fourth joint of the left that is divided, so 
as to form the fourth and fifth of the right, the distal part resulting from 
this division, or the fifth joint of the eleven-jointed antenna, is even a little 
wider than the fourth joint. It is thus apparent, that in this type of the 
Serricorn series, the increase of number of joints from nine to eleven is 
produced by a power of segmentation, or vegetative repetition residing in 
the fourth joint of the antenna. 
Another inference from this series of specimens is that the nominal spe- 
cies of this genus may have been unduly multiplied, and that they must 
be defined by other than antennal characters. A renewed examination of 
the specimens in my collection, indicates that all the species recognized by 
me in the memoir above cited are valid, and enely distinguished by the 
characters there given. 
41. Xyletinus lugubris. Oval, convex, blackish, piceous, dull 
with very fine dense punctuation, and very short pruinose pubescence. 
Prothorax more than twice as wide as its length, very convex, declivous 
near the base, narrowed in front, sides rounded, incurved near the base 
which is slightly bisinuate. Elytra strongly striate, scutellar stria long. 
Beneath black, finely punctulate. Length 2.5 mm.; .10 inch. 
Marquette, Lake Superior. Found ale in Massachusetts 
and Nebraska. This species is allied to X. fucatus, but is 
smaller and less robust, and easily known by the prothorax 
more convex transversely and more declivous towards the 
base. 
Several specimens of YX. fucatus were collected by Mr. 
Crotch at Calaveras, California, which only differ from those 
found at Lake Superior by the smaller size, darker color and 
