1288 FAMILY LVIII. — MELANDRYID.^S. 



KEY TO INDIANA GENERA OF TETRATOMINI. 



«. Auteiuial club composed of four joints. 



h. Margins of thorax not reflexed at sides ; larger, 5-('> mm. 



I. Tetratoma. 

 hb. Margins of thorax ratiicr broadly concave and retlexed, the edge un- 

 evenly crenulale; length less than 4 mm. 

 r. Rasal segment of abdomen as long as the next two combinwl; color 

 above mottled, black and jialc II. Ahstrui.ia. 



cc. Rasal segment of abdomen i)ut 111 tie longer than second; color 

 above blackish, not mottled but elytra with an indetinite, oblique 

 yellowish streak. Incoi.ia. 



ini. Aiitcniial club composed of three .ioiiils; eyes smaller, very short and 

 strongly tiansverse; length aliout :! mm. III. I'isenis. 



I. TiOTHATOMA Fab. 1790. (Or., " Tour + joints.") 



This s'<?nus, as li)iiitetl ])y Casey, contains two species, one of 

 wliicli occurs in tlie State. 



2.">S1 (7ti4(j). TlOTKATOMA TRI NCOKliM LOC, NOW Sp. N. A. Col., I, 1S(*)(), 14.5. 



Elongate-oval, strcMigly convex. Thorax, legs and under surface red- 

 dish-yellow; head and antenme black; elytra steel blue. Antennae two- 

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

 thirds wider than long, sides rcmnded from base to ape.x, liind angles ob- 

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

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

 munded to ajiex; surface sparsely, irregularly and deeply punet.-ite. Length 

 4.I'i-(> nun. 



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

 in dry fungi and lieneath liarlc of fungns-covered h)gs, 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 fovea' larger, deep and less punctiform 

 than in Tetratoma; scutellum smaller and more quadrate; elytra 

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

 tinctly })ubescent. Three nominal species are recognized by Casey. 

 One of these is in the collection at hand, ^vhile another he descrilied 

 from the State. 



key to INDIANA SPECIES OF ABSTRULIA. 



(/, Basal joint of hind tarsi very much shorter than last joint; yellow of 



elytra greater in extent than the black. 2:582. tesseli^ta. 



tid. I'.asal joint scarcely shorter than the last; black of elytra much greater 



in extent than the yellow. mactlata. 



