THE PII.L BEETLES. 673 



II. CyTiLT;s Ericlis. \Gv., " covering + mud.") 



In this genus and the next the head is vortical or bent down- 

 ward, the labrum distinct and fitting close to the front, and the 

 body covered with a tine, easily removed pubescence forming varied 

 patterns. Two species of Cytilus are known, both of which occur 

 in Indiana. 



128S (3887). CYTiLfs sericeus Forst., Nov. Spec. Insect., 1771. 



Subovate, narrowed in front, strongly convex. Bronzed black, shining; 

 densely covered with a fine pubescence which, on head and thorax, is nearly 

 uniform bronzed ; on elytra the four or five inner intervals are alternately 

 narrow and uniform metallic green, and wider, slightly elevated, and green 

 tesselated with black. Head and thorax rather finely and densely, elytra 

 more sparsely and coarsely, punctate ; the punctures visible only after the 

 pubescence is removed. Length 5 mm. 



Lake and Warren counties; freciuent along the beach of Lake 

 Michigan. Islay 28-July 28. 



1289 (3888). Cytilus TKivriTATUs Melsh., Proc. Phil. Acad. Nat. Sci., II, 



1844, 117. 

 Resembles the preceding in form and structure but a little larger. Uni- 

 form dull bronze ; thorax with a patch of golden hair at middle of base ; 

 elytra with the alternate intervals slightly elevated and tesselate with 

 squarish black spots. Length 5.5-6.5 mm. 



Lake and Laporte counties, beneath rubbish along the beach of 

 Lake Michigan; scarce. Taken with sericeus, and may eventually 

 prove to be the female of that species. ~SlRy 20-iIay 28. 



in. Byrkhus Linn. 1766. (Gr., "a hide.") 



To this genus belong the largest members of the fam- 

 ily. They resemble closely those of Cytilus, but have all 

 the tarsi strongly retractile. Two of the eight known 

 species from North America li<ive been taken in the State. Byrl^'pUuivsL 



(Fig. 251.) A E„™p,.a„ .,..: 



1290 CWSD). Byreius ajierk anus Lee, Agassiz Lake Sup., 1850, 224. 

 Oval, strongly convex, nairowed in front. Black, densely covered with 



fine grayish pubescence; thorax indistinctly marked with gray; elytra each 

 with three or four narrow interrupted black lines and a double, narrow, 

 sinuous gi'ay crossbar at middle. Length 8.5-9.5 mm. 



Lake and Lapovte counties, along the beach of Lake ^Michigan; 

 scarce. May 20-June 10. 



1201 (3895). Byrbhus mikinus Fab., Syst. El., I, 1801, 104. 



Piounded-ovate, strongly cnn^-ex. Black, closely pubescent and covered 

 with numerous short, erect, bristle-like hairs; elytra each with four or five 



