LEAF=MINING BEETLES. 



Hispini 



See p. 363. Most of the larvae live in leaves, feeding on 

 the tissue between the two surfaces. See in this connec- 

 tion the Micro-lepidoptera and Bracliys. The first three 

 segments, back of the head, of a Hispine larva are wider 

 than the rest of the body. 



Microrhopala (antennas cither thread-like or the last 4 

 joints united into an oblong mass; elytra not, or only 

 feebly, ridged) and Octotoma (the last 2 antennal joints 

 enlarged; elytra with short, oblique folds) have 8 or 9 

 antennal joints. The others have n, and some of them 

 may be separated as follows. 



1. Elytra ridged 2, 



Elytra not ridged; body elongate. Stenispa. S. 



metallica is a uniform, shining black, slightly bronzed; 

 length .2 in. The pronotum of collaris is red; length 

 slightly over .25 in. 



2. Middle tibias strongly curved Charistena. 



Middle tibiae straight. Chalepus, also called Odontata. 



The following species are about .25 in. long, except as 

 noted 3, 



3. Each elytron with ten rows of punctures; ridged 4, 



Each elytron with eight rows of punctures ; color varies 



from nearly uniform rose-red to nearly black, with a few 

 indistinct reddish or yellowish spots; legs pale; length 

 about .17 in. On locust Chalepus nervosa. 



4. Each elytron with only three ridges 5, 



Each elytron with three ridges, and a fourth (at base 



and apex) between the second and third. See Plate 

 LXXXIII. On locust (Robina), basswood, and other 

 trees Chalepus rubra. 



5. Elytra wholly black; pronotum wholly red 



Chalepus bicolor. 



Elytra black, with red shoulders ; pronotum red, with a 

 dark center Chalepus scapularis. 



Elytra and pronotum scarlet, fading to yellowish, 

 with a black, sutural line which becomes gradually broader 

 as it reaches the apex. The larva makes a blotch mine on 

 locust Chalepus dorsalis. 



375 



