ORDER COLEOPTERA 201 



from plants of the genera Boltonia and Sericocarpus. The 

 eggs are smaller than those of M. vittata and they are closely 

 appressed to the surface of the leaf. They are covered with 

 dark, nearly black excremental matter. They are usually 

 deposited on the under surface of the leaf near its edge and 

 remote from the petiole. 



The larvae are able to migrate from leaf to leaf and to re- 

 enter the parenchyma. The mines are blister-like, variable 

 in size and shape and they often occupy a large share of the 

 leaf. As many as four larvae may develop in a single large 

 leaf. At the point in the mine where pupation occurs it 

 "puffs up so as to form a hard blister, more or less rounded 

 oval in shape, and usually a little over an eighth of an inch 

 wide." Such cells have been observed at Washington, D. C, 

 as early as tenth of June. In hot weather the pupal 

 stage lasts from four to six days. The full grown larva 

 measures from 6 to 6.5 mm. and the pupa about 5.5 mm. 

 The pupae, like those of the locust leaf-mining beetle are 

 capable of forward movement. 



A Southern species, Microrhopala floridana, was reared 

 by Messrs. Hubbard and Schwarz from larvae found mining 

 terminal portions of the leaves of the grass-leaved golden 

 aster, Chrysopsis graminifolia, in Florida. 



Stenopodius and Uroplata 



Single species of these genera are known to mine leaves ; 

 Uroplata porcata on Panicum capillare reported by Frost 

 (1924) and Stenopodius flavidus on Sphaeralcea grossula- 

 riaefolia reported by Jones and Brisley (1925). 



Halticinae. Most of the so-called jumping or flea-beetles 

 feed on the surface of leaves or burrow in stalks or roots, 

 but some of the smaller species insinuate themselves into 

 leaves. The beetles are capable of leaping about by reason 

 of their greatly thickened hind femora or thighs. As adults 



