461 



Chez ce monstre, en effet, le parasite étant placé à côté de l'auto- 

 site, la tète du premier, si elle a existé, a dû présenter, à un certain 

 degré d'évolution, avec la tête de l'autosite, les rapports de l'opodymie. 

 Or, si j'entends bien la description et la figure qu'en donne l'auteur du 

 Précis de Tératologie (p. 475, f. 264), la mâchoire supplémentaire 

 et la mâchoire normale du dit monstre pleuradelphe présentent exacte- 

 ment la même orientation réciproque que dans notre monstre opodyme, 

 l'unique différence des deux cas, à ce point de vue, consistant dans 

 l'inégal développement et le rapprochement beaucoup plus considérable 

 (poussé jusqu'à l'inclusion l'un dans l'autre) de ces deux organes chez 

 le monstre pleuradelphe. 



Ce dernier est donc simplement double, et non triple, comme 

 l'admet à tort l'auteur du dit Précis de Tératologie (p. 494). 



Santiago du Chili, 22 septembre 1896. 



II. Mittheilungen aus Museen, Instituten etc. 



1. Lìnnean Society of New South Wales. 



August 26th, 1896. — 1) On the Australian Bembidiides referable to 

 the Genus Tachys (Fam. Cafabidae), with the Description of a new allied 

 Genus. By Thomas G. Sloane. All the Australian Bembidiids having the 

 anterior tibiae decidedly oblique above the apex on the external side, are 

 referred to the genus Tachys. Twenty-seven species are tabulated, of which 

 eleven are described as new. A new genus [Pyrrotachys] is proposed for an 

 insect from Tamworth, N.S.W. — Mr. Rainbow exhibited a spray of 

 Silver wattle [Acacia dealhata) with hymenopterous galls simulating the 

 appearance of Lepidopterous larvae. The specimen was procured by Mr. 

 Affleck, M.L.A., at Bundarra, N.S.W. — Mr. Froggatt exhibited a col- 

 lection of Australian Coccids comprising representatives of thirty genera and 

 ninety species, and including a number of rare species described by Mr. 

 Maskell in some of his recent papers on this family. Among the rarer species 

 of note were Ceronema banhsiae found upon Banksia serrata, Aspidiotus pallens 

 on Macrozamia, Mytilaspis spinifera upon Acacia pendula, Eriococcus spiniger 

 and Ctenochiton eucalypti upon Eucalyptus ; also the well known St. José 

 scale [Aapidiotus perniciosus) upon an apple bought in a Sydney fruit shop. 



September 30th, 1896. — 1) Botanical. — 2) Australian Lampreys. 

 By J. Douglas O gii by. In his recent treatment of the Hyperoartii or true 

 Lampreys, the author follows Dr. Gill in recognising two Families character- 

 ised by the separation or unity of the suproral lamina ; to the first [Morda- 

 ciidae) belongs the Short-headed Lamprey, Mordacia mordax, to the second 

 [Peiromyzonidae] the Narrow-mouthed Lamprey, Velasia steiiosiomus , and 

 the Wide-mouthed Lamprey, Geotria ausiralis, these three being the only 

 species which the author admits as valid. An exhaustive generic and specific 

 diagnosis is given of the three forms, and all that is known or has been 

 hitherto published concerning them has been carefully digested. Undoubt- 

 edly the gi'eatest interest centres on the second of these species, since it is 

 not only considered advisable to separate the Australasian form from the 



