scholarly journals A melanic form of Homothermon praemorsus (Burmeister) (Coleoptera: Scarabaeidae: Rutelinae) from Paraguay

2019 ◽  
Vol 45 (4) ◽  
pp. 629-632
Author(s):  
Sergio D. Ríos ◽  
Bolívar R. Garcete-Barrett
Keyword(s):  
1976 ◽  
Vol 7 (4) ◽  
pp. 261-266 ◽  

AbstractRandom samples of B. betularius males show a clinal variation in the degree of melanism: from high melanic frequencies in Denmark and south-west Sweden to almost no melanism in south Finland. Old samples from Denmark dating back to the end of the 19th century have strikingly lower melanic frequencies than recent samples showing an increase in melanism during the 20th century in NW Europe. Levels of air pollution and melanic frequency coincide fairly well indicating that the spread of melanism is a response to increased air pollution as also is demonstrated elsewhere. In Britain, in central Europe, and in USA a black morph has evolved whereas in NW Europe the grey morph (insularius) is the predominating melanic form indicating that evolution of melanism in B. betularius has followed its own course in NW Europe.


Nature ◽  
1964 ◽  
Vol 202 (4928) ◽  
pp. 215-216 ◽  
Author(s):  
C. A. CLARKE ◽  
P. M. SHEPPARD
Keyword(s):  

Nature ◽  
1944 ◽  
Vol 154 (3906) ◽  
pp. 334-335 ◽  
Author(s):  
J. S. WATSON

2013 ◽  
Vol 11 (4) ◽  
pp. 79-91
Author(s):  
Piotr Ceryngier ◽  
Jerzy Romanowski ◽  
Justyna Szymańska ◽  
Maja Galanciak ◽  
Marta Bardzińska ◽  
...  

Samples of the invasive alien ladybird, Harmonia axyridis, were collected between 27 July and 8 August 2013 at four localities on the Pelješac Peninsula in southern Croatia. Altogether, 209 individuals were collected, of which 114 (54.5%) were males and 95 (45.5%) females. Three color forms were present in the samples: the non-melanic form succinea and the melanic forms spectabilis and conspicua. The form succinea clearly predominated (90.5% of collected individuals) followed by spectabilis (8.1%) and conspicua (1.4%). The ectoparasitic fungus Hesperomyces virescens, not previously reported from Croatia, was found on the elytron of one H. axyridis individual. The localities in Pelješac Peninsula mentioned in this paper are the southernmost of all Croatian localities so far reported to be colonized by H. axyridis.


1900 ◽  
Vol 39 (1) ◽  
pp. 13-14
Author(s):  
Percy Hall Grimshaw

In a collection of Indian butterflies purchased by the Edinburgh Museum in the year 1890, I found a specimen of Hestina which is of some interest. After carefully examining it, and comparing it with a figure by Oberthür of a form which he regards as a melanic aberration of the well-known Hestina nama, Doubleday, I have come to the conclusion that our example is another and more melanic form of the same species. From Oberthür's figure, which he calls ab. melanina (Études d'Entomologie, xx., 1896, p. 30, pl. 10, no. 177), the present specimen differs in the fore wing, in the absence of the inner row of whitish spots, in the size and position of the upper spots in the outer series, and in the spot at the anal angle being nearer to the base of the wing. At the base of the cell there is a rich cream-coloured sub-triangular spot, instead of the slender greenish streak. There is no ferruginous border to the hind wing, and the whitish streaks are more elongated, and in the anal half of the wing only very faintly indicated.


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