THE TUMBLING PLOWEE BEETLES. 1311 



KEY TO INDIANA SPECIES OF TOMOXIA. 



H. Last joint of maxillary palpi long, triangular ; scutellum emarginate be- 

 hind- 2421. BIDENTATA. 



aa. Last joint of maxillary palpi broadly hatchet-shaped; scutellum tri- 

 angular. 2422. HiiAHis. 



2421 (7773). Tomoxia bidrxtata Say, Journ. Phil. Acad. Nat. Sci., Ill, 

 1824, 277; ibid. II, 164. 

 Robust, wedge-shaped. Brown, varied with ash-gray pubescence as fol- 

 lows: four stripes on thorax radiating from the middle of front margin, 

 which, with the side margins, is also ash-gray ; elytra each with three or 

 four stripes on basal half, a broken crossband behind middle and the apex 

 ash-gray ; a large rhomboidal brown spot on each near base. Length 10- 

 13 mm. 



Lake, Vigo and Posey counties; scarce. February 6-June 7. 

 Occurs on dead trees. T. lineella Lee, 5-7 mm. in length, the elytra 

 marked with narrow ash-gray liaes, is now recognized as the male of 

 hidentata. 



2-122 (7776). Tomoxia hilaris Say, Best. Journ. Nat. Hist^ I, 1835, 190; 

 ibid. II, 661. 

 Form wedge-shaped; more slender than Wdeiitata. Blaclc, varied with 

 ash-gray pubescence; elytra with a narrow sub-basal band of brownish- 

 yellow pubescence and a broader one behind the middle, the two connected 

 along the suture and margined with ash-gray pubescence. I^ength 9-13 mm. 



Described from Indiana. Two in Stein collection, probably from 

 Posey County. 



IV. MoBDELLA. Linn. 1758. (L., "bite.") 



Rather large wedge-shaped forms having the scutellum triangu- 

 lar; anal style usually long and slender; last joint of maxillary palpi 

 long, triangular and obliquely truncate (except in the male of ocu- 

 Infa). Nine of the 19 recognized forms have been taken in the 

 State, while two others may occur. 



KEY TO INDtANA SPECIES OF MOBDELLA. 



u. Anal style short and truncate; dull blacl;; ; thorax and elytra sprinkled 

 with small spots of silvery pubescence, the latter with narrow inter- 

 rupted band on apical ?hird composed of confluent spots. borealis. 

 na. Anal style long and slender. 



h. Last joint of maxillary palpi triangular, the sides unequal, 

 c. Elytra dark, without conspicuous markings. 

 183—234021 



