THE HAIRY FUNGUS BEETLES. 



583 



LeConte. — "Synopsis of the Mycetophagidae of the United 

 States," in Proe. Phil. Acad. Nat. ScL, VIII, 1856, 12-15. 



fforn. — "Tables of the Species of Mycetophagus and Litargus,'' 

 in Proc. Amer. Phil. Soc. XVII. 1878, 603-608. 



Casey. — "Review of the American Tritomidae (Mycetophagi- 

 da})," in Journ. N. Y. Ent. Soc, VIII. 1000, 128-138. 



Of the five North American genera, four are represented in 

 Indiana. 



KEY TO INDIANA GENERA OF MYCETOPHAGID.^E. 



a. Basal angles of thorax well defined : length 1.5 or more mm. 



h. Eyes transverse, sinuate in front ; antenna? gradually enlarged, usual- 

 ly without distinct club ; epipleura horizontal and flat. 



I. Mycetophagus. 



hh. Eyes more rounded, not sinuate; antenna- with joints 9-11 suddenly 

 larger. 



c. Clypeal suture not deeply impressed ; body much smaller and more 

 oval : epipleura concave, rapidly descending. II. Litargus. 



cc. Clypeal suture deep ; epipleura horizontal and flat. 



III. Typh.ea. 



an. Hind angles broadly rounded: length less than 1 mm. 



IV. Thrimolls. 



I. MvcETOPHACriis Hellw. 1792. (Or., "mushroom + eating. ") 



Oblong-oval, moderately convex insects, clothed rather sparsely 

 with short, stiff, reclined hairs. Six species have been taken in 

 Indiana. 



KEY TO INDIANA SPECIES OF MYCETOPHAGUS. 



a. Antemne gradually larger toward tips; body broadly oblong-oval; sub- 

 basal foveas of thorax deep and distinct. 

 h. Thorax widest at base. 



c. Last joint of antennae elongate, distinctly longer than the two pre- 

 ceding combined: size larger, 4.5 or more mm. 



1111. PUNCTATUS. 



cc. Last joint of antenna? shorter, never longer than the two preceding 

 combined; size smaller, not over 1 mm. 

 d. Prosternum nearly smooth at middle. 1112. flexuosus. 



(7(7. Prosternum densely and coarsely punctured ; antenna? with a 

 feeble, parallel 4-jointed club. 1113. bipustulatus. 



hh. Thorax narrower at base than at middle; antennal club 5-jointed. 

 e. Margin of thorax entire, the disk coarsely and deeply punctured. 



1114. melsheimeri. 



cc. Margin of* thorax serrulate: elytra with numerous small yellow 



Spots. 1115. PLURIPUNCTATUS. 



aa. Antenna? with last three joints rather suddenly larger; thorax without 

 sub-basal fovea? ; elytra piceons spotted with yellow. 



111G. OBSOLETUS. 



