176 



AN ECONOMIC ENTOMOLOGY. 



black, while the thorax is usually more or less red or yellow. 

 Our common clover-feeding species is L. vwzardi. It is rarely 

 that any species becomes abundant enough to do noticeable in- 



FiG. 151. 



Langiiria vwzardi. — a, egg ; b, larva in clover stem ; c, larva ; d, pupa ; e, adult. 



jury ; but in clover, if a sufficiently large infested area occurs, 

 prompt close cutting or turning under the sod will be most 

 effective in checking present and preventing future injury. 



The OicujidcB are elongate and very much flattened beetles, 

 fitted to live under bark of trees or in the narrow crevices where 



Fig. 152. 



Silvanus stirinamensis. — a, beetle; b, pupa; c, larva. 



they are usually found. Some of the species of Silva7i2is, notably 

 S. suri7iamensis , a brown species, hardly more than one- eighth 



