CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 327 



Eggs. — Small, white, much longer than broad; hatch in about 10 days. 

 Larva. — Fleshy, slender, ^4 inch long, dull white with a dark brown 

 head and prothorax; two dark horny points at posterior end. 

 Pupa.— White; formed in a burrow in wood. 



PTINID^ (DEATH-WATCH AND DRUG STORE BEETLES) 



Apple -twig Borer (Amphicerus bicaudalus Say). — (Consult Farmers' 

 Bull. 70, U. S. Dep. Agr.) Adult. A cylindrical ptinid beetle, }yi 

 inch long; dark brown above and black beneath; front of thorax with 

 minute rough points; male with two little horns in front, two near the 

 ends of wing-covers. Mature in the fall. Bores in early spring into 

 twigs of apple, grape, pear, etc. 



jE^^^. — ^Laid in May in dead roots of smilax, or in dead shoots of 

 grape. 



Larva. — Develops during summer, transforming to pupa and beetle 

 in fall. 



Other more or less important forms belonging to this family are: 

 the Drug Store Beetle {Sitodrepa panicea Linn.) which infests such 

 drugs as ginger, rhubarb, licorice, peppermint and seeds; also flour, 

 breakfast foods, chocolate, black pepper, coffee, dried beans and 

 peas; also books and manuscripts; the Cigarette Beetle (Lasioderma 

 serricorne Fab.) which infests tobacco in every form, pepper, ginger, 

 rhubarb, rice, figs, yeast cakes, etc.; and the Death Watch (Anobium 

 tesselatiim) which occurs in timbers and tunneling in woodwork of 

 houses. 



LYCTIDiE (POWDER POST BEETLES) 



Several species of Lyctiis bore into dry stored sap wood, and are 

 known as Powder Post Beetles. The adult insects are small, slender, 

 dark brown beetles. Eggs are laid in the wood, and the grubs tunnel 

 in every direction through the wood. In a short time the interior 

 of the infested material may be reduced to powder. 



Control.^In house furniture remove and burn any replaceable 

 infested parts; paint rest of infested surface with kerosene, giving 

 several applications as long as boring dust appears. 



TENEBRIONIDiE (DARKLING BEETLES) 



Yellow Meal-worm {J^enehrio molitor Linn.). Adult. — A darkling 

 beetle, ^4 inch long, somewhat flattened; head and thorax finely 



