];llfi famiFjV lxi. — mokdellid.e. 



Ki:v TO (iRorps of Indiana mokdelustena. 

 (/. lliiid tibia' ;iiul first Joint of liiud tarsi each with a sinj;le sliort. olilitiue 

 ridge near tip. ( I-M.t:. r)T(;. No. i.j.) (Jroup A. 



(Id. Hind tibi:e witli two or more oblique ridges on outer face. 

 h. Hind tibia' with lint two oblique ridges on outer face. 



c. Ridges of tibia> converging above. (Fig. r>T(>. No. 17.) (Jroup />'. 

 cc. Ridges of tibiae parallel. 



(1. Ridges equal in length. (Fig. 577, a.) (Jroup ('. 



(hi. Itidges une(iual. the upper one extending almost across the outer 

 lace of the tibia'. (Fig. r.7S, a.) (Jrnnii D. 



hi). Hind tiliia' with tlirce or more slinrt. obliciue parallel ridges. 



c. Hind tibia' with but three ridges. (Fig. 570, h.) (iroup E. 



cc. Hind tibia' with f(Hir oi' m(.re ridges. (Fig. nso. a.) Uroup F. 



Group A. 



This (jrmip is represented in the eolh.^ction by two speeies. 



2483 ( 771)5 ). Mokdelustena bktxcteij.a Lee. I'roc. Phil. Acad. Nat. Sci.. 

 XIY. 3 802, 48. 

 Bod.v narrow, parallel. Black; elytra with two yellow hands, first near 

 base and interrupted by suture, second one fourth from tips; head, antenna' 

 and legs, except hind femora, dull yellow; thorax s.imetimes black, some- 

 times brick red. Length 2-2.5 mm. (Fig. 57(1 No. IC). ) 



Stenhen and ]\[arshall counties; searee. .lune 11-July fi. 



2434 ( ). Mordeleistena confusa sp. nov. 



Very slender, parallel. Black, sparsely clothed with browmish pubes- 

 cence; elytra with an oblong, dull yellow humeral spot; labrnin, pal]>i, tarsi 

 .and alxlominal process dull brownish-yellow. Length 2.5 nun. 



]\rartin C-ountv; rare. May 16. Resembles hipJagiata in color, 



but nnieli more slender and wdth Imt one ridg-e on tibia? and first 



tarsal. 



Group B. 



This g-rotip contains two nniform l)rownish-yellow species hav- 

 ing the tibial ridges not iiarallel, but converging above. 



KEY TO INDIANA SPECIES OF GROl'P D. 



a. First joint of hind t.-irsi with two. second with one obli(iue ridge; ridges 



of tibia' short, less strongly marked. 24:'.5. li'tea. 



(Id. First joint of hind tarsi with three, second with one oblique ridge: 



ridges of tibi:e long, vi'ry strongly marked. 243(J. arida. 



2435 (77!>7). :\Iordellistena lutea Melsli.. I'roc. I'hil. Acad. Nat. Sci., II, 



1845, 315. 

 Blender, wedge-shaped. TTniform brownish-yellow ; elytra densely clothed 

 with yellow i)ul)escence. Length 2.8-3.2 mm. 



]\rarion, (Grange and Posey counties; scarce. June 1-Jime 9. 



