8. Abstammungslehre. 483 



l(M)G) Baer, W. (Mitt. aus dem zoolog. [nstit. Tharandt), Über Paururua 



juvencus L. 



(Tharandter forstliches Jahrbuch 61,1. p. 95 96. IülO.) 

 Die Angaben Konows (Chalastogastra 1901 — 1905) über die Trennung 

 der stahlblauen Holzwespen in zwei Arten Paururus noctilio Fabr. und P. ju- 

 veneus L. werden nach einer Aufzucht von 73 Exemplaren bestätigt. Konows 

 Notizen über die Fraßpflanzen werden richtig gestellt. 



Eckstein (Eberswalde). 



1007) Sargent, C. S., Crataegus in Pennsylvania. II. 



(Proc. Aead, of Nat. Sc. of Phil. 63,1. p. 150—253. 1910.) 

 The paper Covers a five-year study of Crataegus in Pennsylvania and 

 Supplements the work of the author published in 1905. Large areas are as 

 yet unstudied and a third paper is to appear in the near future. 



N. M. Stevens (Bryn Mawr). 



1008) Southern, R., A new species of Enchytraeid worm. 



(Proc. Acad. of Nat. Sc. of Phil. 62,1. p. 18—20. 1910.) 

 The author found a Single speeimen of this Enchytraeid worm in some 

 damp moss brought from the White Monntains in 1907 by Dr. Scharff. 

 He proposes the name Hanlea Scharffi, and states that it is characterized by 

 the strueture of the nephridia and spermathecae, the number of setae, the 

 place of origin of the dorsal vessel, and the absence of salivary glands and 

 intestinal pouches. N. M. Stevens (Bryn Mawr). 



1009) Pilsbry, H. A. and J. H. Ferris, Mollusca of the Southern 

 States: IV. The Chiricahua Mountains, Arizona. 



(Proc. Acad. of Nat. Sc. of Phil. 62,1. p. 44—147. PI. 1—14. 1910.) 

 The level mesa between mountain ranges of Southern Arizona has since 

 the Pliocena formed a barrier as impassable to land snails as an equal expanse 

 of the sea. Isolation is also favoured by the harren northwestern slopes of 

 the canyons, and further by the habits of the snails which live deep in the 

 rocky talus or slides. The progressive growth of canyons constantly accen- 

 tuates the isolation of colonies by forming new slopes, one of which im each 

 case is arid. The Chiricahuan snails show none of the characteristics usually 

 ascribed to the influence of a desert environment. Oreohelix chirieahuana. 

 and in some cases Heliospira are the only Chiricahuan snails that live on or 

 near the surface, and they are the only ones that have a shell notably chalky 

 or opaque. Size of individual snails is almost wholly a funetion of exposure, 

 those living on northern or northwestern exposures being invariably larger 

 than those on southern or eastern slopes, regardless of elevation. The fact 

 that allied but distinet species are found living under apparently identical 

 conditions leads the authors to doubt the potency of environment as a direct 

 agent in effecting specific differentiation. "The facts," they say, "seem ex- 

 plicable only on the hypothesis of variations existing or arising in the Con- 

 stitution of the egg, leading to modifications of the adult organism, which 

 for the greater part are indifferent as affecting the well-being of the race." 

 A systematic description of the species collected Covers nearly a hundred 

 species. N. M. Stevens (Bryn Mawr). 



1010) Costantin et ISois, Sur Lee gralnea et tubercules des tom- 

 beaux p6ruviens de la periode incasique. 



(Revue ge"ne"rale de Botanique 22,258. p. 242— 2G6. 1910.) 



