1288 FAMILY LVIII. MELANDRYtD.E. 



KEY TO INDIANA GENERA OF TETRATOMINI. 



. Antennal club composed of four joints. 



1>. Margins of thorax not retiexed at sides ; larger, 5-0 mm. 



I. TETRATOMA. 



I>1>. Margins of thorax rather broadly concave and reflexed, the edge un- 

 evenly eremilate; length less than 4 nun. 



r. Basal segment of abdomen as long as the next t\vo combined; color 



above mottled, black and pale. II. ABSTRULIA. 



re. Basal segment of abdomen but little longer than second; color 



a 1 Hive blackish, not mottled but elytra with an indefinite, oblique 



yellowish streak. INCOLIA. 



(/(/. Antennal dub composed of three joints; eyes smaller, very short and 



strongly transverse; length about ."> mm. III. PISENUS. 



I. TSTRATOMA Fab. 1790. (Gr., "four + joints.") 



This genus, as limited by Casey, contains two species, one of 

 which occurs in the State. 



2.'!.si (7C>4<;). TETRATOMA TRIXCOUTM Lee.. New Sp. X. A. Col.. 1, 1x<;t;, 14">. 



Elnngate-oval. strongly convex. Thorax, legs and under surface red- 

 dish-yellow; head and antenna' black; elytra steel blue. Antenna' two- 

 lift hs as long as body, the club as long as the basal portion. Thorax two- 

 thirds wider than long, sides rounded from base to apex, hind angles ob- 

 tuse; surface sparsely, deeply and rather coarsely punctate, the basal im- 

 pressions small, deep, rounded. Elytra parallel to apical third, thence 

 rounded to apex; surface sparsely, irregularly and deeply punctate. Lengiii 

 4.5-G mm. 



Southern half of State; scarce. March 6-Deeember 21. Occurs 

 in dry fungi and beneath hark of fungus-covered logs, more espe- 

 cially those of beech. 



II. ABSTRULIA Casey. 1000. 



Small oblong-oval species having the margins of thorax wider 

 and more reflexed, its basal foveo. 1 larger, deep and less punctiform 

 than in Tetratoma; scutellum smaller and more quadrate; elytra 

 mottled instead of unicolorous as there; surface sparsely but dis- 

 tinctly pubescent. Three nominal species are recognized by Casey. 

 One of these is in the collection at hand, while another he described 

 from the State. 



KEY TO INDIANA SPECIES OF ABSTRULIA. 



a-. Basal joint of hind tarsi very much shorter than last joint; yellow of 



elytra greater in extent than the black. 2382. TESSELLATA. 



ttd. Basal joint scarcely shorter than the last; black of elytra much greater 



in extent than the yellow. MACUI.ATA. 



