A description of a new tapeworm species, Catenotaenia henttoneni, parasitizing the voles Clethrionomys glareolus and C. rutilus (Arvicolidac) in Finnish Lapland, is given. Wc show that all Catenotaenia from arvicolid rodents in Europe, usually described as C. cricetorum Kirschenblat, 1949, evidently represent the species C. henttoneni.
Let $A_n$ $(n \geq 1)$ be the set of all integers $x$ such that there exists a connected graph on $n$ vertices with precisely $x$ spanning trees. It was shown by Sedláček that $|A_n|$ grows faster than the linear function. In this paper, we show that $|A_{n}|$ grows faster than $\sqrt {n} {\rm e}^{({2\pi }/{\sqrt 3})\sqrt {n/\log {n}}}$ by making use of some asymptotic results for prime partitions. The result settles a question posed in J. Sedláček, On the number of spanning trees of finite graphs, Čas. Pěst. Mat., 94 (1969), 217–221.
In contemporary Czech society the changes of reproduction patterns take place. They are characterized by postponing the marriage and parenthood. So called informal partnerships or unmarried couples are becoming more frequent which also results in a growing number of births of extra-marital children. The number of women with children without partner is growing, too. Authors differentiate three types of them - widows, divorced women and women who voluntary want to have child without long-term partner. The third type of women is usually middle age, around 35 years old, they are successful in their jobs and they have enough financial resources to bring up child by themselves. The paper is based on pilot survey where 118 women took part. Respondents insist that woman can rear the child as good as both parents can do. However the specialists dispute this statement. According to psychologists children need both parents and the role of father cannot be easily substituted. Thus, the phenomenon of single parent family has to be considered within the complex set of conditions.