ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 29 



its model. Poulton lias pointed out the colour-markings common to 

 non-mimicking and mimicking species of the genus Limenitis, and has 

 indicated the changes by which the latter may have been derived from 

 the former by selection. Abbott has tested this view, and decides against 

 it. The colour markings of Limenitis arthemis, from which L. archippus 

 is supposed to have been derived, display a marked degree of variability, 

 those markings involved in the Poulton hypothesis much less so, how- 

 ever, than the blues and other colours not considered in that theory. 

 According to that theory the influence of selection should be manifest 

 in marked emphasis (or percentage of occurrence) on those markings 

 that incline towards the type of Anosia, the model. This Abbott finds 

 not to be the case. The curves for all the characters involved are 

 exceptionally symmetrical, and the skewness is so insignificant that 

 the curves may be treated as normal, indicating that in the individuals 

 studied, no selection with reference to the mimetic colours has taken 

 place. 



Life-history of Agriades thersites. — T. A. Chapman * gives an 

 account of the eggs, larvse, and pupse of this butterfly. He gives 

 fine photograghs showing the minute structure of the skin at various 

 parts and in various stages, the hairs, the honey-gland region, the 

 cremastral area of the pupa, and the "pockets" of the pupa. In an- 

 other paper f he describes a new form of seasonal dimorphism in the 

 same species. 



Genital Armature in Lepidoptera.J — G-. T. Bethune-Baker brings 

 forward evidence to show that the male genital armature affords valuable 

 guidance in taxonomy and phylogeny. Its characters are reliable in the 

 discrimination of genera as well as of species. Instances are given from 

 the Lycamidas in particular, but also from the Nyrnphalidse and other 

 families. 



Heredity of Melanism in Lepidoptera.§ — W. Bowater concludes 

 that the weight of evidence up to the present seems to show that 

 melanism in Lepidoptera frequently follows the Mendelian law of 

 heredity, and in most cases is dominant, but in some few species is 

 recessive. 



Sense-organs of Dytiscus Wings. || — Richard Lehr describes the 

 various groups of cupola-like sense-organs at the base of the anterior 

 wings and the chordotonal organ in the subcostal vein, giving a 

 detailed account of the minute structure. Besides the sensory organs 

 at the base there are sensory setse on other parts, especially near the 

 anterior margin, which are tactile in function. Passing to the elytra, 

 Lehr describes its cupola-like organs, hollow cones, and sensory seta', 

 distinguishing three kinds of the latter. All the sensory structures on 



* Trans. Entomol. Soc, 1914, pp. 285-308 (28 pis.). 



t Trans. Entomol. Soc. 1914, pp. 309-13 (1 pi.). 



X Trans. Entomol. Soc, 1914, pt. 2, pp. 314-37 (11 pis.). 



§ Journ. Genetics, iii. (1914) pp. 299-315 (1 pi.). 



|| Zeitschr. wiss. Zool., ex. (1914) pp. 87-150 (45 figs.). 



