50 
PROCEEDINGS OF THE NATl'RAL 
[Dec., 1885. 
Wig. 
No. 
307. 
308. 
309. 
. 310. 
311. 
312. 
313. 
314. 
315. 
316. 
317. 
318. 
319. 
320. 
321. 
322. 
323. 
324. 
325. 
326. 
327. 
328. 
329. 
Amer. 
No. 
1300. 
1308. 
1310. 
1312. 
1315. 
1316. 
1317. 
1321. 
1324. 
1332. 
1334. 
COLYMBETES, Civ. 
sculptilis y Harr.Abundant in the lake as soon as the 
ice has left the shore. In early 
spring. 
DYTISCUS, Linn. 
Harrisii, Kirby.Quite rare in the lake and rivers. 
All summer. 
conjluens, Say. 
marginicollis, Lee... 
fasciventris, Say. 
hybridus, Aube. 
RHANTUS, Esch. 
binotatus, Harr. 
bistriatus, Bergst.... 
sinuatus, Lee. 
ILYBIUS, Er. 
picipes, Kirby. 
biguttatus, Germ. 
-Same as the preceding. 
-Somewhat commoner than the pre¬ 
ceding. 
• Our commonest species. In the lake 
and rivers. Most abundant in 
spring. 
Common in spring in the lake and 
ponds. 
In spring in ponds and in the lake. 
Rare. 
More common than the preceding. 
In same situations. 
Common in very cold springs on the 
clayey lake banks near Whitefish 
Bay. 
Common in lakes and ponds. In 
spring. 
Ihe same as the preceding. 
1337. 
1338. 
1340. 
1346. 
1351. 
1352. 
1365. 
1366. 
1367. 
1371. 
1377. 
1379. 
UN AT US, Aube. 
bicarinatus , Sav... t„ M no ,. r , 
- - - in Muskego Lake. Very rare. 
COPTOTOMUS, Say. 
interrogate , Fab. ...“.Abundant u, 
naant m every pond in spring. 
COPELATTJS, Er. 
glyphicus , Say.e nmninri . 
- Common in some ponds in spring. 
GATTRODYTES, Thoms. 
taeniolatus, Harr t»^ , 
. In s P ° nd8 »nd in the lake. In 
semipunctatus, Kirby T i 1-,’tv. 8 ’ Comin °n- 
aeneolus, Or....... "t , P«*»ding. 
parallelus , Lee. ij'° precedi «g- 
infuseatus, Aube. R are 
scapular is, Mannh.pj 1 1 *‘ ,e preceding species. 
punclulatus , Aube S ' mu ' as the preceding. 
«*, Auk.. . astJ >e preceding. 
lugem, Lee. Sil ' rar *7 In Lake Michigan. 
. Same as the preceding. 
