554 



FAMILY XIX. COLYDIIDJE. 



KEY TO INDIANA GENERA OF COLYDIINI. 



a. Front tibiae finely denticulate at outer apical angle ; form rather robust. 



V. Aulonium. 



aa. Front tibiae with outer apical angle prolonged ; form very slender. 



VI. COLYDIUM. 



V. Aulonium Erichs? 1832. (Or., "pipe or channel.") 



Antenna? 11-jointed, the last three joints forming a rather loose 

 club; inserted in front of the eyes, which are emarginate in front 

 by the sides of the clypeus; hind coxns separated by a triangular, 

 acute abdominal process. Two of the four known species occur in 

 Indiana, 



1059 (3272). Aulonium parallelopipedum Say. Journ. Phil. Acad. Nat. 



Sci., V, 1826, 263 ; ibid. II. 324. 



Elongate, subcylindrical. Piceous-black, rather shining; legs and an- 

 tenna? reddish-brown. Head with two, often indistinct, tubercles on vertex. 

 Thorax quadrate, the disk with a raised line on each side which curves 

 and unites on front margin, and two obtuse tubercles in front of middle ; 

 sides feebly curved, surface finely punctate ; hind angles rectangular. Ely- 

 tra slightly wider than thorax, with rows of rather fine, close set punc- 

 tures. Length 4.5-6 mm. 



Southern half of State; frequent, Not yet noted in northern 

 counties. " Probably hibernates. March 17-November 22. Occurs 

 beneath bark. 



1060 (3274). Aulonium tuberculatum Lee, New Spec. N. Am. Col.. 



1863, 67. 



Elongate, subcylindrical. Reddish-brown, rather shining, the apical 

 half of elytra piceous. Thorax longer than wide, sides nearly straight, 

 hind angles obtuse : disk with two raised lines on each side, one of which 

 is near the margin, surface finely and sparsely punctate, the male with two 

 tubercles near front margin. Elytra not wider than thorax, the rows of 

 punctures very fine. Length 5.5 mm. 



Lake County ; rare. June 6-October 13. Known from the 

 State by two specimens taken from beneath the bark of the north- 

 ern scrub pine, Finns divaricata Ait. 



VI. Colydium Fab. 1792. (Gr., "sheath.") 



This genus is represented in the United States and Indiana by 

 the single species : 



