1878. ] 593 [LeConte. 
The Coleoptera of Michigan. 
By H. G. Huspsparp anp E. A. SCHWARZ. 
(Read before the American Philosophical Society, April 18th, 1878.) 
1. Descriptions of New Species by Joun L. LeConre, M.D. 
I have written these descriptions in order that fewer species without 
names may be referred to in the two lists which form the bulk of the 
present memoir. 
The lists of the Coleoptera of the Upper and Lower Peninsulas of Michi- 
gan respectively, have been prepared by the authors with great care, after 
extensive explorations and collections in the two regions. The species, as 
far as described, have been identified with the series contained in my col- 
lection, and I cannot sufficiently express my thanks, to both Mr. Hubbard 
and Mr. Schwarz, for the great liberality with which they have given me 
even unique specimens, so that all the material necessary for comparison 
and investigation is placed in one single collection. My series, therefore, 
both of Florida and Michigan Coleoptera, contain all the species cata- 
logued in their lists, and a basis for future studies in geographical distribu- 
tion has been thus firmly established. 
I have added to the list of the species from Lake Superior all those col- 
lected in my own extensive explorations of that basin, which were not 
contained in the collections of the authors. This list is therefore to be 
considered as a complete catalogue of the Coleopterous fauna of that 
region, so far as at present known, and exhibits some very interesting 
points in geographical distribution. 
Especially worthy of notice is the large proportion of species common 
to Lake Superior and Alaska, and if types of the other species described by 
Mannerheim and Maklin were accessible for comparison, the number of 
forms in this category could doubtless be still farther increased. Space and 
time alike forbid my making a separate list of such species on the present 
occasion, but I intend to recur to the subject again, when larger series from 
the Alpine heights of the Rocky Mountains have been collected. The oc- 
currence at Lake Superior of Huthia scitula and Syntomium confragosum, 
previously known only from Alaska, and Gonotropis gibbosa from Colorado, 
deserves mention ; as also the extension northward of Callida smaragdina. 
1.,.Dyschirius brevispinus. Shining black, feebly bronzed, rather 
robust, antenne, palpi, and legs rufous. Epistoma very slightly emarginate, 
angles not prominent, transverse impression deep, frontal impressions also 
deep. Prothorax longer than wide, oval, a little wider behind ; lateral mar- 
gin extremely fine, scarcely continued behind the posterior lateral punc- 
ture. Elytra oval, as wide as the prothorax, brownish at the tip, base not 
margined ; strie uniformly abbreviated in front, very coarsely pune red; 
obliterated a little behind the middle, 8th represented at the tip by a short 
groove; scutellar puncture large ; dorsal punctures two, one on the 3d in- 
terspace near the base, the 2d near the 2d stria about the middle. Front 
PROC. AMER. PHILOS. soc. xviI. 101. 83v. PRINTED JUNE 11, 1878. 
