602 



SwEZEY (O. H.). A Dermestid infesting Garden Seeds (Col.). — Proc. 

 Haivaiian Ent. Soc, 1920, Honolulu, iv, no. 3, September 1921, 

 pp. 487-488. 



A Dermestid, believed to be Eucnocerus antliycnoidcs. Sharp, which 

 occurs in Mexico and Panama, was found in large numbers in 1920 

 in a tin box containing garden seeds in Hawaii. The tin had apparently 

 been tightly closed for a year and a half. Some of the packages in 

 the box had come from Pennsylvania. Maize, both in packages and 

 on the ear, was badly eaten, as well as other seeds. The only previous 

 record of this beetle in Hawaii is of one individual taken in 1919. 



TiMBERLAKE (P. H.). Descfiption oJ a new Species of Ootetrastichus 

 from Formosa (Hymen., Chaleid.). — Proc. Hawaiian Ent. Soc, 



1920, Honolulu, iv, no. 3, September 1921, pp. 557-564, 5 tigs. 



The species of Ootetrastichus introduced from Formosa in 1916 has 

 since become established in Hawaii [R. A.E., A, viii, 72], and is here 

 described as 0. forniosanus, sp. n. The description is taken from 

 individuals reared from Perkinsislla saccharicida. Kirk., in Hawaii. 



MuiR (F.). The Sugar Cane Leafhopper and its Parasites in Hawaii. — 



Hawaiian Planters' Record, Honolulu, xxv, no. 3, September 



1921, pp. 108-123, 2 plates, 4 figs. 



An account is given of Pcrkinsiella saccharicida (sugar-cane leaf- 

 hopper), as occurring in Hawaii. The 23 known species of this genus 

 are enumerated, with the distril)ution of each. A close study has been 

 made of the various factors limiting the activities of the genus Pcrkin- 

 siella in the countries bordering the Pacific, and efforts have been 

 made to introduce into Hawaii as many of these factors as possible. 

 A graph illustrates the workings of the various primary, secondary 

 and tertiary parasites of P. saccharicida in Hawaii, and their inter- 

 relations, showing 41 species that act and interact upon one another 

 to the advantage or disadvantage of the central host. Though this 

 interaction is fairly complicated, Paranagrus optabilis, Perk., is the 

 keystone of the whole problem, and without it all the other factors 

 would be unable to hold the leaf-hopper in check. 



The primary parasites of the egg are : — the Mymarid, Paranagrus 

 optabilis, mentioned above, which has 2h generations to one of its 

 host, and is therefore a very efficient parasite ; Anagrus frequens. 

 Perk., closely related to P. optabilis, and with a similar life-cycle, but 

 far less numerous ; Ootetrastichus beatus. Perk. ; and 0. formosanus, 

 Timb. The bug, Cyrtorhinus mundulus. Bred., feeds on the contents 

 of the eggs, but does not increase as rapidly as could be wished. 

 Enemies of the young and adults are the lacewings, Anonialochrysa 

 deceptor, Perk., A. raphidioides. Perk., .-1. gayi, Perk., Chrysopa 

 microphya, McLachl., and another unidentified species of Chrysopa, 

 the larvae of which are predaceous ; Conocephalus saltator, Sauss. 

 (long-horned grasshopper) ; the earwigs, Anisolabis annulipes and 

 Chelisoches morio ; andtheRhynchota, Triphleps persequens, Physopleur- 

 ella mundulus, Reduviolus blackburni, R. capsiforinis and Zelus renardii. 

 Of these, the last-named is b\' far the most abundant and important 

 economically ; not only, however, does it attack both adult and young 

 of P. saccharicida, but it also attacks most of the direct enemies, so 

 that on the whole it is considered to be more harmful than beneficial 



