f>44 FAMILY XVTI1. EROTYL1D.-K 



(L Last joint of palpi widely liatrhet-shapecl ; thorax yellow with four 



lilnck spots; length T-S nun. V. ISCHYRUS. 



<1<I. Last joint of palpi oval or slightly triangular; thorax yellow or black. 



rarely with two spots; length less than mm. 



r. Middle area of mentnin large, transverse. VI. MYCOTRETTS. 



ee. Middle area of meutnm small, triangular. VII. TRITO.MA. 



II. PL<EOKOMA Woll. 1854. 



Tliis genus is represented in the eastern United States and In- 

 dian;) by a single very small b--own soecies. 



in.,7 (.",212). I'rxKoso.MA IM-.MTAI'A Lee.. Traits. Amer. Ent. Soc.. V. IS75. 



171. 



Oval, rather strongly convex. 1'niforni dark chestnut-brown: antenn:e 

 and legs paler. Thorax twice as wide as long, tinely and sparsely punctate. 

 Klylra distinctly but rather sparsely and irregularly punctate, and nar- 

 rowed to a rounded apex. Length '2-'2. 5 mm. 



Southern two-thirds of State: common. Hibernates. April 9- 

 December 3. Gregarious in winter and early spring beneath bark, 

 especially that of elm and willow, 



111. DACNK Latr. 17%. (Gr.. "bite or sting.") 



This genus is represented in the I nited States by three small 

 species, one of which occurs in Indiana. 



io:;x <:;-JI:M. DACMO 4-MAcuLATA Say. r.osi. jount. Nat. Hist., i. is::r,. H;M: 



ibid. II, 045. 



Oblong, parallel. I'lack; elytra each with a round reddish-yellow spot 

 on humerus and another at apex; beneath piceons or dark reddish-brown. 

 the antenna', legs and clypeus paler. Head and thorax closely but sparsely 

 punctiite: elytra with numerous rows of fine punctures. Length 2.5-3.2 mm. 



Throughout the State, i'reenent in the southern counties; less so 

 northward. April 15-Sejiteniber 21. Occurs in fungi. 



IV. Miv.'ALODACNE Crotch. 1S73. (Gr., "large + bite.") 



Here belong the largest species of the family, handsome black 

 and yellow forms, having the fourth joint of tarsi smaller but dis- 

 t'ni't : last joint of palpi subcylindrical and the mentnm triangular. 

 Three species are known from the United States, all of which occur 

 in Indiana. 



KKV TO INDIANA STKCTKS OK M KOALODACNK. 



<i. Klylra willmut rows <,f pnnclures ; length 1S -21 mm. 10-10. HF.KOS. 



<KI. Klytra with rows of line punctures. 



