ORDER COLEOPTERA 197 



sentative. Species of genus which mine as larvae are well 

 known in Europe and Asia. In the case of Hispa testacea, 

 Sharpe recounts that it mines the leaves of Cistus salviae- 

 folius in South Europe. It has the habit of occupying two 

 different leaves, one of which it enters soon after hatching. 

 When it has hollowed about three-fourths of the first leaf 

 it ruptures the epidermis of the upper surface and seeks 

 another leaf. This found, it places itself on the midrib, 

 tears the upper epidermis, and lodges itself in the leaf. In 

 the case of the second leaf, the larva attacks the parenchyma 

 in the neighborhood of the petiole and forms an irregular 

 tube which has an open mouth at the point of entry. In 

 this tube it completes its metamorphosis. 



Chalepus and Baliosus 



These two closely allied genera contain a number of leaf- 

 mining species the best account of which is that of Chitten- 

 den (1904), from which we borrow both facts and figures. 



These are very pretty little beetles, something less than 

 a quarter of an inch long, sometimes colored brightly in 

 orange or red and black, and having the wing covers 

 elegantly sculptured with large pits arranged in double rows 

 between raised longitudinal ridges. The commoner species 

 are thus strongly marked, and easily recognizable. 



The leaf-mining locust beetle, C. dorsalis, is perhaps the 

 species best known, on account of the midsummer damage it 

 does to the leaves of the black locust (Robinia pseudoacacia) . 

 "In cases of severe attack the leaves turn brown as if 

 scorched by fire." 



The adult beetles make their appearance in early spring 

 as soon as the locust leaves are fully developed. They are 

 small, less than 6 mm. long, and so strikingly colored as to 

 be easily recognized. They are bright orange red above, 

 with the head and a stripe along the suture of the wing cases 

 black. The underside and legs are also black. Each wing 



