1224 



FAMILY LILT. CHRYSOMELIDJE. 



KEY TO INDIANA GENERA OE HISPINI. 



a. Antennae 8- or 9- jointed. 



6. Antennae filiform or fusiform, the last four joints being united into 

 an oblong mass ; elytra oval, convex, not or feebly costate. 



LXXIII. Microrhopala. 

 hb. Antennae clavate, the last two joints forming an elongate-oval club ; 

 elytra with short, oblique folds, the intervals punctured. 



LXXIV. Octotoma. 



aa. Antennae with 11 distinct joints. 



c. Elytra costate, the striae coarsely punctate. 



d. Middle tibiae straight. LXXV. Chalepus. 



dd. Middle tibiae strongly curved. Charistena. 

 cc. Elytra not costate, striae finely punctate ; body elongate. 



LXXVI. Stenispa. 



LXXIII. Microrhopala Chew 1834. (Gr., ''little + club.") 



In addition to characters given in key this genus has the thorax 

 usually broader than long and wider at base; legs short, tibiae 

 straight; third tarsal joint deeply bilobed. Six of the 12 species 

 recognized by Horn should occur in the State. 



KEY TO INDIANA SPECIES OF MICRORHOPALA. 



a. Elytra with only eigbt rows of punctures ; last joint of tarsi very little 

 or not longer than the lobes of the third joint. 

 l>. Joints 2 to 6 of antennae nearly smooth and without hairs ; elytra 

 black, with the second costa and a narrow line at side red. 



2265. VITTATA. 



l>l). Joints 2 to 6 of antennae roughly sculptured and somewhat hairy. 

 c. Body above bicolored, black, with the sides of thorax and elytral 

 stripe reddish-yellow. 2266. xeeene. 



cc. Body above entirely dark blue or slightly greenish. 



d. Punctures of the outer rows on elytra much larger and of more 

 irregular size than the inner. 2267. excavata. 



dd. Punctures of all the rows equal and distinct. cyanea. 

 aa. Elytra with at least ten rows of punctures on the apical half. 



e. Black ; interval between the third and fourth costae with four rows 

 of punctures near apex ; form slender, parallel. porcata. 

 ee. Reddish-yellow; elytra with small black spots and with ten entire 

 rows of punctures ; last joint of tarsi nearly twice as long as the 

 lobes of the third. melsheimeri. 



2265 (7060). Miceorhopala vittata Eabr., Ent. Syst. Supp.. 1798. 117. 



Oblong-oval, subdepressed. Black or bluish-black, feebly bronzed ; head, 

 thorax, second costa and narrow marginal line of elytra, and often the base 

 of femora, red. Thorax twice as wide as long, sparsely, coarsely and rather 

 shallowly punctured. Eljira with eight rows of oblong punctures arranged 

 in pairs ; alternate intervals broader and a little more convex. Length 5- 

 6.5 mm. 



Lake County; rare. May 20. 



