1316 



FAMILY LXT. MORDELLIM. 



KEY TO GROUPS OF INDIANA MOKDELLISTENA. 



a. Hind tibiae and first joint of hind tarsi each with a single short, oblique 

 ridge near tip. (Fig. 576, No. 15.) Group A. 



act. Hind tibiae with two or more oblique ridges on outer face. 

 h. Hind tibiae with but two oblique ridges on outer face. 



c. Ridges of tibia- converging above. (Fig. 576, No. 17.) Group B. 

 ce. Ridges of tibia? parallel. 



d. Ridges equal in length. (Fig. 577, a.) Group G\ 



dd. Ridges unequal, the upper one extending almost across the outer 

 face of the tibia?. (Fig. 578, a.) Group J), 



hi). Hind tibia? with three or more short, oblique parallel ridges. 



e. Hind tibia? with but three ridges. (Fig. 579. b.) Group E. 



ee. Hind tibia? with four or more ridges. (Fig. 580, a.) Group F. 



Group A. 



This group is represented in the collection by two species. 



2433 (7795). Mordellistena bicinctella Lee. Proc. Phil. Acad. Nat. Sci. 



XIV, 1862, 48. 



Body narrow, parallel. Black ; elytra with two yellow bands, first near 

 base and interrupted by suture, second one fourth from tips ; hend, antenna* 

 and legs, except hind femora, dull yellow ; thorax sometimes black, some- 

 times brick red. Length 2-2,5 mm. (Fig. 576, No. 16.) 



Steuben and Marshall counties; scarce. June 11- July 6. 



2434 ( ). Mordellistena confusa sp. nov. 



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

 cence; elytra with an oblong, dull yellow humeral spot ; labrum, palpi, tarsi 

 and abdominal process dull brownish-yellow. Length 2.5 mm. 



Martin County; rare. May 16. Resembles Uplagiata in color, 

 but much more slender and with but one ridge on tibiae and first 

 tarsal. 



Group B. 



This g TOl ip contains two uniform brownish -yellow species hav- 

 ing the tibial ridges not parallel, but converging above. 



KEY TO INDIANA SPECIES OF GROUP B. 



a. First joint of hind tarsi with two, second with one oblique ridge; ridges 

 of tibia} short, less strongly marked. 2435. lutea. 



aa. First joint of hind tarsi with three, second with one oblique ridge; 

 ridges of tibiae long, very strongly marked. 2436. arida 



2435 (7797). Mordellistena lutea Melsh., Proc. Phil. Acad. Nat. Sci., II, 



1845, 315. 



Slender, wedge-shaped. Uniform brownish-yellow ; elytra densely clothed 

 with yellow pubescence. Length 2.8-3.2 mm. 



Marion, Orange and Posey counties ; scarce. June 1-June 9. 



