28 



A MANUAL OP DANGEROUS INSECTS. 



giis. (See text fig. 15.) A very important pest. C. merrfijcem Linnaeus; Europe; 

 onion, leek, garlic, lily of the valley, asparagus. 



Injury: Feed on the stems of the asparagus and cause much injury, amounting 

 often to thousands of dollars. 



Fig. 15.— Asparagus beetle ( Crioceris duodecim p<inctat.a): a, Adult; 6, larva; c, d, details of larval structure. 



(Chittenden.) 



Biology: Eggs laid on plant. Larva feeds on stems and foliage. Pupates in soil. 

 Two broods per annum. 



SoRAUER, p. Handbuch der Pflanzenkrankheiten, 3d ed., vol. 3, 1913, p. 510. 

 Chittenden, F. H. U. S. Dept. Agr., Bur. Entomology, circ. 102, 1908, 12 pp.. 6 figs. 



Fig. 16. — Asparagus miner (Agroviyza simplex): Adults. (Chittenden.) 



Agroinyza inaura Meigen. * Agromyza simplex Loew. 



(Asparagus Miners. Agromyzidae; Diptera.) 



Hosts: Asparagus. 



Injury: Mine immediately under the bark of the asparagus stem. The latter 

 species has been introduced into the United States. 



Description and biology: Adult fly very small. Larva white, legless. Pupates in 

 mine. (See text figs. 16, 17.) 



