RECENT ADVANCES IN SCIENCE 645 



has been tested by Allee {Jour. Exper. Zool. Aug. 1916), who 

 finds that potassium salts are most effective in producing 

 greater positive results. Hurst writes " On the Occurrence of 

 the Tropical Fowl Mite (Liponyssus bursa Burlese) in Australia 

 and a new Instance of its attacking Man " {Ann. Mag. Nat. 

 Hist. Aug. 1 91 6). " The Genera and Species of Mallophaga " 

 by Harrison {Parasitology, Oct. 191 6) is a very long, useful, 

 and probably complete list of the Mallophaga so far recorded 

 with a revision of the nomenclature, a bibliography, and a 

 scheme of classification. 



Distant has two notes on Hemiptera : " Rhynchotal 

 Notes : LX." {Ann. and Mag. Nat. Hist. July 191 6), and 

 " Rhynchotal Notes : LXI." {ibid. Sept. 1916). 



The previous work of Payne has been extended, and a 

 discussion of the various constituent parts of the germ cells 

 given in " A Study of the Germ Cells of Gryllotalpa borealis and 

 Gryllotalpa vulgaris" {Jour. Morph. Dec. 19 16). 



The Hymenoptera are dealt with by Cockerell in " Descrip- 

 tions and Records of Bees : LXXII." {Ann. and Mag. Nat. Hist. 

 July 191 6) ; by Turner in " Notes on Fossorial Hymenoptera : 

 XXII. On some Australian Genera " {ibid. Sept. 1916) and 

 " Notes on Fossorial Hymenoptera: XXIV. On the Genus Nitela 

 Latr." {ibid. Oct. 191 6). " Trioexhra gossi, a New Genus and 

 Species of Odonata from the Eocene of Bournemouth," is 

 placed on record by Campion {ibid. Aug. 191 6). 



Edwards describes " New and little known Tipulidce 

 chiefly from Formosa" {ibid. Sept. 1916) and "Two New 

 Australian Diptera " {ibid. Dec. 191 6). It is suggested by 

 Williams in " Photogenic Organs and Embryology of Lam- 

 pyrids " {Jour. Morph. Dec. 191 6) that the light of the fire- 

 fly is for bringing together the sexes. All organs are of the 

 same general plan and consist of an upper reflector layer and 

 a lower or photogenic layer of cells. Tracheae and nerves 

 penetrate both layers but are more highly developed in the 

 lower. About eighty species of diptera were examined by 

 Metz and described in " Chromosome Studies on the Diptera : 

 II. The Paired Association of Chromosomes in the Diptera and 

 its Significance " {Jour. Exper. Zool. July 191 6), who concludes : 

 1 . The paired arrangement of chromosomes is selective to the 

 highest degree. 2. Each maternal chromosome becomes asso- 

 ciated with a definite, similar paternal chromosome and with 



