546 



FAMILY XVTII. — EROTYLIDiE. 



*1042 (3219). Ischyeus quadripunctatus Oliv., Enc. Meth. Ins., VI, 1808, 

 437. 



Ovate, subeloiigate, convex. Head black ; thorax yel- 

 low, with four black dots in a row across the middle; 

 elytra yellow, with a large common scntellar spot, a 

 smaller one on humerus, a deeply dentate median band 

 and an oblong spot on each at apex, black ; beneath black, 

 the sides o£ abdomen yellow. Head and thorax sparsely 

 and coarsely punctate ; elytra with rows of distinct punc- 

 tures. Length 7-8 mm. (Fig. 205.) 



Frequent throughout the State. January 21- 



Eig. 205. X 3. . 



(After wickham.) December 8. Gregarious in winter, hibernating be- 

 neath bark and logs. In early spring often found at sap • in sum- 

 mer on fungi. 



VI. Mycotretus Lac. 1842. (Gr., " fungus + to perforate.") 



Small oval, red or black insects, having the last joint of palpi 

 oval, antennas abruptly 3- jointed and eyes finely granulated. Two 

 species are known from Indiana, while a third may occur. 



KEY TO INDIANA SPECIES OF MYCOTRETUS. 



a. Thorax black ; elytra wholly or in great part dull red. 



1). Elytra and scutellum wholly dull red. 1043. sanguinipennis. 



1)1). Elytra partly black; scutellum black. 1044. pulchra. 



aa. Thorax reddish-yellow with two black spots; elytra wholly black. 



dissimulator. 



1043 (3222). Mycotretus sanguinipennis Say, Journ. Phil. Acad. Nat. 



Sci., IV, 1825, 89 ; ibid. II, 229. 

 Broadly ovate. Head and thorax black, shining; scutellum and elytra 

 pale red ; beneath black, abdomen red. Head and thorax finely and sparsely 

 punctured, the latter more coarsely near base, which is sinuate each side. 

 Elytral stride with deep, rather close punctures; intervals finely but dis- 

 tinctly punctate. Length 4-4.5 mm. 



Frequent in southern half of State; less so in the northern coun- 

 ties. April 25-October 20. Occurs most commonly on fleshy fungi. 



1044 (3223). Mycotretus pulchra Say, Journ. Phil. Acad. Nat. Sci., V, 



1826, 301 ; ibid. II, 345. 

 Ovate. Head, thorax and scutellum black ; elytra red wfith the apical 

 third obliquely black, the black space extending on side nearly to humerus. 

 Surface punctate as in the preceding, but the punctures of elytral strire 

 finer. Length 3.5 mm. 



Marion, ~Vigo, Knox and Pasey counties; frequent. April 9- 



June 19. 



M. dissimulator Crotch, length 4.5 mm., was described from 

 Illinois. 



