THE LEAF BEETLES. 



1171 



from which they emerge as imagoes in six to ten days. There are 

 usually two broods each season, those of the second hibernating. 



The only remedy is the spraying of the trees with an arsenical 

 solution two or three times a year; once just after the buds have 

 opened, to kill as many of the mating insects as possible; a second 

 time two or three weeks later to kill the larva?, the majority of which 

 have hatched by that time. A third spraying about June first will 

 also be found beneficial. The crushing of the larvte at the surface 

 of the ground when they are about to transform is also recom- 

 mended. With the foothold that it has gained the beetle will un- 

 doubtedly spread over the southern third of the State and ulti- 

 mately do much damage to the many noble elms of that section. 



Monoxia puncticoilis Say, pale yellow to entirely black, or elytra 

 with stripes, length 7-8.5 mm., is known from Massachusetts and 

 Florida westward. 



XLVI. DIABROTICA Chev. 1850. f Gr., " through + gnaw. ' ' ) 



Small or medium-sized, oval or ob- 

 long beetles having the head not inserted 

 as far as the eyes, which are broadly oval 

 and entire ; antennre slender, longer than 

 half the body, second and third joints 

 often very small ; thorax broader than 

 long, sometimes nearly square, the disk 

 usually with two pits or foveas; elytra 

 with a very distinct and slightly reflexed 

 side margin ; front coxre contiguous, the 

 cavities open behind; tibiae slender, the 

 middle and hind pair with terminal 

 spurs, the outer edge usually carinate 

 from knee to tip ; first joint of hind 

 tarsus as long as the next two; tarsal 

 claws bifid. Three species have been 

 taken in the State, and a fourth prob- 

 ablv occurs. 



Fig. 511. X 5i 

 (After Forbes. ) 



KEY TO INDIANA SPECIES OF DIABROTICA. 



ft. Tibhn carinate alun:; the outer edge; elytra without black stripes. 



l>. Elytra each with six black spots ; abdomen and base of femora pale. 



2169. 12-PUNCTATA, 



6&. Elytra unicolorous without spots. 



