214 LAKE SUPERIOR. 



i 



tseniatus Aube', 311. Colymb. int. Fabr. 1, 267. 



Colymbetes teen. Harris N. E. F. ? Colymb. venustus S. Am. TV. 2, 98. 



ambiguus. Coptot. serripalpis Say. ib. 4, 443. 



Colymb. amb. Say. Am. TV. 2, 96. LACCOPHILUS Leach. 



Ag. infuscatus Aube, 330. maculosus Say. Am. TV. 2, 100. 



punctulatus Aube, 332. americanus Aube, 442. 



semipunctatus. HYDROPORUS Clairmlle. 



Col. semip. Kb. N. Z. 69. punctatus Aube, 471. 



fimbriatus. Laccoph. punct. Say. Exp. 2, 271. 



Ag. reticulatus \\ Aube, 335. cuspidatus Germ; Aube', 477. 



tristis Aube', 356. Hygrotus pustulatus Mels. P. Ac. 



bifarius. 2, 29. 



Colymb. bif. Kb. N. Z.l\. " sericeus. 



COPELATUS Er. 43 consimilis. 



Chevrolatii Aube', 389. affinis Say. Am. TV. 2, 104. 



COPTOTOMUS Say. nanus Aube', 504. 



interrogatus Aube', 393. M 12-lineatus. 



similis Kirby N. Z. 68. 



42 H. sericeus. Ovalis convexiusculus, confertissime punctulatus, densius fulvo- 

 pubescens, rufus : clypeo late marginato, thorace lateribus obliquis rectis cum elytris 

 angulum obtusissimum formantibus, antice posticeque anguste nigricante ; elytris 

 atro-brunneis, lineis 4 plus minusve interruptis margineque lato ferrugineis, hoc pone 

 medium bimaculato. Long. '18. 



$ nitidiusculus, pube minus longa, thorace subtiliter punctato. 



9 opaca, pube longiore, tota subtilissime punctata. 



The interrupted lines have not a tendency to coalesce into fasciae, as in H. pubipen- 

 nis (Aubf 1 ), from which it is easily known by the longer pubescence and finer punctua- 

 tion ; the body is less attenuated behind, and a little more convex. The thorax is 

 much more narrowly margined, and, when viewed sideways, forms a very slight angle 

 with the margin of the elytra. 



43 H. consimilis. Ovalis convexiusculus, postice modice attcnuatus, confertissime 

 punctulatus, breviter dense fulvo-pubescens, ferrugineus, clypeo late marginato, thorace 

 lateribus obliquis rotundatis, cum elytris angulum obtusissimum formante, antice 

 posticeque infuscato ; elytris atro-brunneis, margine fasciis 2 irregularibus maculaque 

 apicali ferrugineis. Long. '18. 



$ capite thoraceque nitidulis, hoc distinctius punctato differt. 



Spots as in the last, but confluent into bands ; from H. pubipennis distinguished by 

 the rounded and more narrowly margined sides of the thorax. 



44 H. 12-lineatus. Elongato-ovalis minus convexus, omnium subtilissime alutaceus, 

 sparsimque punctulatus, subtus niger, supra testaceus, vertice nigro bimaculato, thorace 

 lateribus subrotundatis, cum elytris angulum formantibus, postice vix transversim 

 depresso nigro bimaculato, elytris versus apicem oblique attenuatis, sutura lineolis 

 utrinque 6 maculisque 2 sub-marginalibus nigris ; antennarum basi palpis pedibusque 

 testaceis. Long. - 17. 



$ elytris apice integro vix obliquo. 



$ elytris apice truncate, fere bidentato. 



Les Ecrits. Thorax bisinuate at base, external angles not at all rounded or obtuse ; 



