791 A. E. Verrill— The Bermuda Islands. 379 
identified by Dr. Horn. Specimens have been received by me from 
several correspondents. Common in the southern United States. 
It is said to be very injurious to sweet potatoes by tunnelling both 
in the stalks and tubers. It also attacks various other crops, such 
as the Irish potato, carrots, celery, beets, corn, sunflower, etc.,. by 
boring in the roots. The larva feeds both on manure and on the 
roots of grasses and other plants.* The color of the mature beetle 
is dark chestnut, chocolate-brown or black; paler when recently 
emerged. The prothorax is thickly, finely punctate, and the elytra 
have coarsely punctate grooves, unequal in size. It comes freely to 
lights and flies very erratically. Length 15-17™™. 
166 165a 1656 165 
Ss 
— 
SSS 
Ss 
Figure 165.—Hard-back, x14, from a photograph. by A. H. V. Figures 
165a, 165b.—Sugar-cane Borer; Corn Borer (Ligyrus rugiceps), nat. size 
and enlarged. Figure 166.—Ptinus fur and larva, enlarged. Figure 
166a.—Bread-beetle (Sitodrepa panicea); a, imago, x4; b, larva, x2. 
Figure 167.—Cigarette Beetle (Lasioderma serricorne); x 64; a, dorsal; 0, 
profile view. From Webster’s International Dictionary ; after Chittenden ; 
166 after Packard’s Guide. 
A closely allied, very injurious species (Z. rugiceps), figs. 165a, 
1656, tunnels in the base of the sugar-cane stalks in the West Indies, 
and will, perhaps, be found here in corn, which it often attacks 
in the same manner. 
Hard-Back. (Ligyrus tumulosus Burm.) Figure 165. 
This species was recorded in 1889 by Professor Heilprin, on the 
authority of Dr. G. H. Horn, (Bermuda Islands, p. 92.) 
* L. Mowbray, who sent the adult larva in December, says that it damages 
arrowroot and potatoes. 
