TIIK 1.1 AIRY FIJNflUS HKKTLES. 583 



LcCoiite. "Synopsis of the Mycetophagid.se of the United 

 States," m Proc. Phil. Acad. Nat. Sci., VITT, 1856, 12-15. 



Horn. "Tables of the Species of Mycetophagus and Litargus, " 

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



Casey 'Review of the American Tritomidio (Mycetophagi- 

 die)." in Jonrn. N. Y. Ent. Soe.. VIII. 1900. 128-138. 



Of the five North American genera, four arc represented in 

 Indiana. 



KEY TO INDIANA GKNKKA OF M Yl'ETOPIIAG ID.K. 



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



l>. Eyes transverse, sinuate in front; anteimaa gradually enlarged, usual- 

 ly without distinct club; epipleura horizontal and flat. 



I. MYCETOPIIAGFS. 

 bit. Eyes more rounded, not sinuate; antenna 1 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; epiplcnra horizontal and flat. 



III. TYPH/EA. 

 tin. Hind angles broadly rounded; length less than 1 mm. 



IV. THRIMOLUS. 



I. MYCETOPHACUTS Hellw. 1792. (Gr., "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. 



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

 basal fovere of thorax deep and distinct, 

 ft. 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 4 mm. 



r7. Prosternuni nearly smooth at middle. 1112. FLEXUOSUS. 



<hL Prosternuni densely and coarsely punctured; anteume with a 

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



1>1>. Thorax narrower at base than at middle; antennal club 5-jointed. 

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



1114. MELSHEIMEBI. 



ec. Margin of thorax serrulate; elytra with numerous small yellow 



Spots. 1115. PLURIPUNCTATUS. 



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

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



1116. OBSOLETUS. 



