CAMPYLAEA CÔERULANS. li 45 
the reproductive system shows all the peculiarities which characterise 
the Campylaeae, but this fact does not give sufficient reason for regar¬ 
ding H. coerulcins as a Campylaea, since the construction of its gnaw¬ 
ing apparatus proves that the directions of development of Campylaea 
and Hazaya have separated. That in spite of this the reproductive 
systems of that two genuses do not show more marked differences can 
be explained from the well known fact that those organs are always 
the first to change, which are more exposed to the transforming power 
of the conditions of life. 
According to Hesse « Hazaya » is a superfluous name, because 
Brusina employed the name « Vidovieia » for H. coerulans five years 
ago. But « Vidovieia » is a simple name without any description, a 
«nomen nudum», which according to the international rule of zoolo¬ 
gical nomenclature 1 can not be used, therefore the new genus must be 
named « Hazaya ». 
1 Règles internationales de la Nomenclature zoologique. Paris, 1905, p. 21 
(French text), p. 35 (English text), p. 49 — 50 (German text), Art. 25. 
