THE LKAF JiKKTLKS. 



1171 



from -whioli they einer^e tis iiiinjioes in six to ten days. There arc 

 iisnally two broods each season, tliose of tlie second liibernating. 



The only I'ciiicdy is the s]irayinu,' <»f the trees with an arsenical 

 solntion two or three times a year; onee jnst 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 larvte, the inajority of which 

 have hatched by that time. A third spraying al)out June first will 

 also be found Iteneficial. 'i'he crushing of the larva^ at the surface 

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

 uu'udod. With the foothold that it lias 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. 



Mo)i<).via jjuiicficollis Say, ])ale yellow to entii'cly ])lack, or elytra 

 with stripes, length 7-8.;") nun., is known from Massachusetts and 

 Florida westward. 



XLYI. DiABROTiCA Chev. 1850. ((Jr., "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: antennae 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 fovea?; elytra 

 with a very distinct and slightly reflexed 

 side margin; front coxa^ contiguous, the 

 cavities open behind; tibia' slender, the 

 middle and hind pair with terminal 

 s[>!ii-s, the outer edge usually carinatc 

 fi-om 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 DIABI?OT[C.\. 



. Tihiii' carinatc alwii:,' the outer edge; cl.vti-a williont black strii)cs. 

 h. Elytra each with six black spots; alxh^uen and base of femora pale. 



2169. 12-PUi\CTATA, 



hh. Elytra unicolorous without spots. 



