742 Goleopterological Notices, VI. 



translucent plate. The genital segment is moderate in size, 

 smooth, polished, even and pale in color, with the apex trans- 

 versely truncate. The other organs are not visible in the type. 



AMBLYDERIS Laf. 



The American species referred to this genus apparently ditter 

 in no essential particular from the North African types of La- 

 Ferte, the tubercles along the crest of the subapical declivity of 

 the pronotum being however always inconspicuous. Amblyderus 

 is without doubt a perfectly valid genus, and will prove to be a 

 tolerably large one in the colder parts of the eastern United 

 States and in the true Pacific coast faunal region, where its mem- 

 bers constitute one of the most characteristic elements of the sea- 

 beach population. 



The eight species here deemed worthy of description may be 

 recognized as follows : — 



Species of the Pacific Coast; elougate-oval, very convex, densely clothed Avith 

 short coarse decumbent pubescence; tubercles and punctures of the prono- 

 tum indiscriminately intermingled and apparently mutuallj' indepen- 

 dent. 

 Larger species, not under 3 mm. in length. 



Elytra black, rarely dark brown, the head and prothorax paler..!, olie^mis 

 Elytra and entire body pale Inteous-white, the integuments translucent; 



elytra shorter and more attenuate near the apex 2. al1)icaiis 



Smaller species, always distinctly less than 3 mm. in length. 



Stouter, the head very small, scarcely more than two-thirds as wide as 



the prothorax 3. parviceps 



Rather slender, the head relatively larger, about five-sixths as wide as the 



prothorax 4. gracileiitiis 



Species of the Great Lakes and Atlantic Coast; tubercles of the pronotum 



situated each immediately before a setigerous puncture, the punctures and 



tubercles evidently mutually connected. 



AntenuiTe shorter, stouter and sul)nu)nilif(>rm except toward base; vestiture 



rather sparse and somewliat readily removable. 



Elytral punctures rather small, sparse and not very strong but al>ruptly 



defined 5. graiiulai'is 



Elytral punctures coarse, much closer and impressed; elytra shorter; pro- 

 thorax much more transverse 0. piiiictiger 



Antenna- long and slender, gradually and more or less feebly stouter to- 

 wai-d apex; vestiture finer and closer; body more oval and convex, the 

 integuments pale. 



Elytra two-tiiirds kmger than wide. Lake Sujierior 7. pallens 



Elytra much shorter and more opacjue, scarcely one-half longer than 

 wide. Atlantic Coast 8. areiiariiis 



