Jan. i S> i9" Four Rhynchophor a Attacking Corn in Storage 613 



SITOPHILUS GRANARIUS 



SYNONYMY 1 



Sitophilus granarius Linn. 1758. 



granarius "Linn. Syst. Nat. Ed. X. p. 378. — Panz. Fn. Germ. 17. 11. — 



Gylh. Schh. Gen. Cure. IV. p. gyj. — Jacq. Duv. Gen. Col. Cure. 1854. t. 



2Q.f. 140. — Frisch. Besckr. All. Ins. 1720. II. p. 36. I. 8. 

 pulicaria Yam. ed. Voet. IV. p. 54. t. 37. f. 17. (forte.) 

 segetis Linn. /. c. p. 381. 

 unicolor Marsh. Ent. Brit. p. 275. — Steph. 77/. Brit. IV. p. g. " 



Sitophilus granarius (PI. 74) was described in 1758 by Linnaeus. 

 It is thought to have originated in the regions cf the Mediterranean, 

 but is now widely distributed throughout the world. It occurs but 

 seldom in the southern States of North America, preferring the cooler 

 climate of the North. 



It is a slender, cylindrical, chestnut-brown beetle with a slender, 

 elongate beak. Technical descriptions of the adult and immature 

 stages follow. 



ADULT 



Elongate-oblong, feebly convex. Chestnut brown to piceous, moderately shining. 

 Beak two-thirds as long as thorax, slender, cylindrical, finely and sparsely punctate. 

 Thorax sparsely punctate, punctures coarse and on the disc more or less fusiform. 

 Elytra deeply striate, striae punctured at bottom, not serrate; intervals smooth, 

 alternately wider and more elevated, especially towards the base; the sutural with a 

 row of elongate punctures. Pygidium coarsely cribate. Body beneath coarsely 

 and less densely punctured than in oryza. Length 3 to 4 mm. 2 



EGG 



Egg opaque, shining white, ovoid to pear-shaped in form, widest below middle, 

 bottom broadly rounded, neck narrowing gradually toward top, which is somewhat 

 flattened and bears a small rounded protuberance that fits into a cap or plug that 

 cements the egg in place. Length 0.68 to 0.80 mm., width about 0.33 mm. 



LARVA 



Mature larva 2.5 to 2.75 mm. in length; a pearly white, footless grub, fleshy and 

 very thick-bodied, ventral outline being approximately straight while dorsal outline 

 is almost semicircular. Head and appendages of head similar in every respect to 

 those of Sitophilus oryza. Thoracic segments similar in external appearance to those 

 of 5. oryza. The abdominal segments are similar in form to those of 5. oryza with 

 the following exceptions which afford the best characters for distinguishing between 

 larvae of these two species: First four abdominal segments divided above into three 

 distinct areas, praescutum, scutum, and scutellum, whereas in the larva of S. oryza 

 the first three only of the abdominal segments are so divided. Middle lobe of the hypo- 

 pleurum of the abdominal segments of 5. granarius is provided with a seta. This 

 seta lacking in larva of 5. oryza. 



1 Gemminger, M., and Harold, B. de. op. err., v 8. p. 2653. 1871. 

 s Blatchley, W. S., and I.eng, C W. op. err., p. 574. 



