1288 FAMILY LVIII. — MELANDRYIM. 



KEY TO INDIANA GENERA OF TETBATOMINI. 



a. Antenna 1 club composed of four joints. 



b. Margins of thorax not reflexed at sides ; larger, 5-0 mm. 



I. Tetratoma. 



bb. Margins of thorax rather broadly concave and reflexed, the edge un- 

 evenly crenulate; length less than 4 mm. 

 c. Basal segment of abdomen as long as the next two combined; color 

 above mottled, black and pale. II. Abstrulia. 



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

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

 yellowish streak. Incolia. 

 (/ff. Anteunal club composed of three joints; eyes smaller, very short and 

 strongly transverse; length about 3 mm. III. Pisenes. 



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



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

 which occurs in the State. 



2381 (764G). Tetratoma trtjncortjm Lee, New Sp. N. A. Col., I, 1866, 145. 



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

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

 fifths 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. Length 

 4.5-6 mm. 



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

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

 cially those of beech. 



II. Abstrulia Casey. 1900. 



Small oblong-oval species having the margins of thorax wider 

 and more reflexed, its basal foveas 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. 



aa. P>asal joint scarcely shorter than the last; black of elytra much greater 

 in extent than the yellow. maculata. 



