367 



Other stored tobacco pests that have been recorded are : Sitodrepa 

 panicea, L., Calandra onjzae, L., Dermesfes vulpinus, F., Trogoderma 

 tarsale, Melsh., Tenebroides mauritanicus, L., Mezmm americamim, 

 Lap., Attagenus piceus, Oliv., and Catorama impressifrons, Fall, the 

 last two as infesting the seed. 



Frost exercises a great check on L. serricorne, the rapid increase 

 of which is also prevented where the tobacco is allowed to become dry. 

 Its most important predatory enemy is a Clerid beetle, Thaneroclerus 

 girodi, Chevr., which is described in detail. The eggs are usually laid 

 in groups of 2 or 3 in the burrows of the tobacco beetle, the incubation 

 period generally lasting about 9 days. Each female lays about 18 

 eggs. The larval period corresponds closely to that of its host, lasting 

 42 to 62 days according to temperature and abundance of food. The 

 pupal stage occupies about 7 days. The larvae feed on the eggs, 

 larvae and pupae of L. serricorne, the adults on the larvae, pupae 

 and adults, but both larvae and adults become cannibals when deprived 

 of other food. 



Hymenopterous parasites of L. serricorne include Aplestomorpha 

 pratti, Crawf., A. vandinei, Tucker, the larva of which feeds externally 

 on the larva and pupa of the tobacco beetle, and a species of Norbanus. 

 A Solpugid spider does considerable damage to cigars in its attempt 

 to reach the eggs and larvae of the tobacco beetle. Mites known to 

 ■ attack the eggs include species of Cheyhtus, TyroglypJms and Rhagidia, 

 the latter having been recorded from the Philippines. * 



The usual remedial measures are described and include freezing, 

 sterilisation by dry heat or steam, trapping by mechanical means, 

 fumigation with carbon bisulphide, hydrocyanic-acid or other gasses 

 and exposure to X-rays. 



Severin (H. C.)- Injurious Corn Insects. — South Dakota Agric. Expt. 



Sta., Brookings, Bull. no. 178, March 1918, pp. 780-813, 16 figs. 



[Received 23rd June 1919.] 

 The life-cycle and remedial measures for the most unportant maize 

 pests in Dakota are described, including : Cirphis unijjiincta, Haw. 

 (army- worm) ; the grasshopper, Melanoplus differ ent iaUs ; Aphis 

 maidiradicis, Forbes (corn-root aphis) ; white grubs [Lachnosterna] and 

 wire worms. 



Beeson (C. F. C). Forest Entomology. — Reprint from Ann. Rept. 

 Bd. Scientific Advice for India, 7917-18; Calcutta, 26th April 

 1919, 4 pp. [Received 30th June 1919.] 



A continuation of the previous year's work is described [see this 

 Review, Ser. A, vi, pp. 519, 521]. An additional ten thousand sal 

 trees \Shorea robusta] were attacked by the Longicorn beetle, Hop- 

 locerambyx spinicornis. With regard to the Cossid moth, Duomitus 

 ceramicus, observations show that this beehole borer appears at an 

 earlier stage and its incidence rises more rapidly in plantations made 

 since 1900 than in older ones. A method was devised for determining 

 the age of beeholes, and it is estimated that each tree in the final crop 

 of an average teak plantation will contain a sufficient number of 



