Cheiridium tetrophthalmum Daday, a new synonym of Larca lata (Hansen) (Pseudoscorpiones, Larcidae)

Cheiridium tetrophthalmum Daday, 1889 is removed from the synonymy of Geogarypus minor (L. Koch, 1873), and treated as a junior synonym of Larca lata (Hansen, 1884). The distribution of Larca lata and Geogarypus minor is documented, and L. lata is recorded from Hungary for the first time

Weltweite Kataloge und Artenzahlen der Spinnentierordnungen (Arachnida)

Volume: 41Start Page: 41End Page: 4

Perturbations of near-horizon geometries and instabilities of Myers-Perry black holes

It is shown that the equations governing linearized gravitational (or electromagnetic) perturbations of the near-horizon geometry of any known extreme vacuum black hole (allowing for a cosmological constant) can be Kaluza-Klein reduced to give the equation of motion of a charged scalar field in AdS_2 with an electric field. One can define an effective Breitenlohner-Freedman bound for such a field. We conjecture that if a perturbation preserves certain symmetries then a violation of this bound should imply an instability of the full black hole solution. Evidence in favour of this conjecture is provided by the extreme Kerr solution and extreme cohomogeneity-1 Myers-Perry solution. In the latter case, we predict an instability in seven or more dimensions and, in 5d, we present results for operator conformal weights assuming the existence of a CFT dual. We sketch a proof of our conjecture for scalar field perturbations.Comment: 24 pages (+ 16 pages appendices), 2 figures. v2: Corrected error in CFT operator dimensions (they are all integers). v3: Various improvements and corrections, in particular for electromagnetic perturbations. Accepted by Physical Review

A new species of Sphaerowithius (Pseudoscorpiones, Withiidae) from Namibia

A new species of Sphaerowithius Mahnert, 1988, S. ansieae sp. n., is described from specimens collected in caves in northern Namibia. The specimens show some slight modifications to an obligate cavernicolous existence including small eyes and long, slender pedipalps

Associations Between Australian Pseudoscorpions and Ants

The distribution of three species of pseudoscorpions, found under the bark of blue gum Eucalyptus globulus, is closely correlated with the presence of three species of ants. Marachernes bellus is never found on trees without Anonychomyrma sp. near foetens, and Protochelifer victorianus and Paraustrochernes victorianus are more commonly found on trees with Technomyrmex jocosus and/or Tapinoma minutum. The distribution of another pseudoscorpion, Conicochernes sp., is not influenced by the presence of these ants. Observations of the behavior of these pseudoscorpions indicate that at least some species may be specialist predators of ants

The millipedes of Barrow Island, Western Australia (Diplopoda)

Six species of millipedes are recorded from Barrow Island, including three species of pin-cushion millipedes of the order Polyxenida, Lophoturus madecassus (Marquet and Condé, 1950) (Lophoproctidae), Unixenus mjoebergi (Verhoeff, 1924) (Polyxenidae) and Phryssonotus novaehollandiae (Silvestri, 1923) (Synxenidae), a single species of the order Spirobolida, Speleostrophus nesiotes Hoffman, 1994 (Trigoniulidae), and two species of the order Polydesmida, Boreohesperus dubitalis Car and Harvey, 2013 (Paradoxosomatidae) and one species of the family Haplodesmidae (genus and species indet.). Lophoturus madecassus is circum-tropical in distribution, Unixenus mjoebergi and Phryssonotus novaehollandiae are found also on mainland Australia, but the other three species are endemic to the island. Speleostrophus nesiotes is a highly modified troglobiotic species, currently listed as threatened by the Western Australian government. It is unclear at present whether the haplodesmid specimen is a troglobite

Personal Income Taxes and the Growth of Small Firms

This paper investigates the effect of entrepreneurs’ personal income tax situations on the growth rates of their enterprises. We analyze the personal income tax returns of a large number of sole proprietors before and after the Tax Reform Act of 1986 and determine how the substantial reductions in marginal tax rates associated with that law affected the growth of their firms as measured by gross receipts. We find that individual income taxes exert a statistically and quantitatively significant influence on firm growth rates. Raising the sole proprietor’s tax price (one minus the marginal tax rate) by 10 percent increases receipts by about 8.4 percent. This finding is consistent with the view that raising income tax rates discourages the growth of small businesses

Microdata Panel Data and Public Policy: National and Cross-National Perspectives

This paper investigates the effect of entrepreneurs\u27 personal income tax situations on the growth rate of their enterprises. We analyze the personal income tax returns of a large number of sole proprietors before and after the Tax Reform Act of 1986 and determine how the substantial reductions in marginal tax rates associated with that law affected the growth of their firms as measured by gross receipts. We find that individual income taxes exert a statistically and quantitatively significant influence on firm growth rates. Raising the sole proprietor\u27s tax price (one minus the marginal tax rate) by 10 percent increases receipts by about 8.4 percent. This findings is consistent with the view that raising income tax rates discourages the growth of small businesses