A novel approach to generating an ultraflat and stable optical frequency comb with tunable frequency spacing is proposed and experimentally demonstrated. The proposed generator consists of a polarization modulator (PolM) and a polarizer. The joint operation of a PolM and a polarizer is equivalent to intensity modulation, but with a third controllable parameter in addition to the two controllabl...

We present an optically stabilized Yb:KYW fslaser frequency comb. We use an f–2f nonlinear interferometer to measure the carrier envelope offset frequency (f0) and the heterodyne beatnote between the comb and a stable CW laser at 1068 nm to detect fluctuations in the comb repetition rate (frep). Both of these degrees of freedom of the comb are then controlled using phase-locked loops. As a demo...

Aporinellus Banks, Austrochares Banks and Dicranoplius Haupt are new generic records for Colombia, as well as the species Dipogon ariel Banks, Evagetes peruana Banks, and Euplaniceps notabilis (Smith). Five new combinations are formally endorsed: Aimatocare argentinica (Banks), comb. n.; Aimatocare longula (Banks), comb. n.; Aimatocare imitator (Evans), comb. n.; Aimatocare impensa (Evans), com...

A revisionary checklist of the Sesiini of southern Africa is presented. All known genera of the region and their type species are redescribed. The following genera are placed in Sesiini for the first time: Alonina Walker, 1856; Anaudia Wallengren, 1863; Austrosetia Felder & Felder, 1874; Megalosphecia Le Cerf, 1916 and Vespanthedon Le Cerf, 1917. The genera Cicinnoscelis Holland, 1893 rev. stat...

The genus Paraheligmonelloides Fukumoto, Kamiya and Suzuki, 1980 (Nippostrongylinae) is revised and split into four genera, mainly based on characters of the synlophe not previously considered at the supraspecific level. These characters mainly include the homology of the left ridge with ridge 1', the relative size of the right ridge to the left ridge and to ridge 1' and the distribution of the...

The genus level diagnostic characters of Acanthosoma Curtis, 1824, Anaxandra Stål, 1876, and Sastragala Amyot & Serville, 1843 (Hemiptera: Heteroptera: Acanthosomatidae) are discussed. The synonymy of Acanthosoma and Anaxandra proposed by Kumar (1974) is supported. Acanthosoma and Sastragala are redefined and recognized as valid genera. The identities of various species of Acanthosoma are clari...

DNA-DNA hybridization experiments and an evaluation of phenotypic characteristics, DNA base ratios and 16S rRNA gene sequences demonstrated that Wautersia eutropha (Davies 1969) Vaneechoutte et al. 2004, the type species of the genus Wautersia, is a later synonym of Cupriavidus necator Makkar and Casida 1987, the type species of the genus Cupriavidus. In conformity with Rules 15, 17, 23a and 37...

The genus Katatopygiagen. n. is proposed for the Boletina erythropyga/punctus-group that was first introduced by Garrett (1924, 1925) and currently comprises eight described species. Molecular studies have strongly indicated that this group forms a monophyletic sister-group to a clade consisting of all other Boletina, Coelosia and Gnoriste, and its monophyly is supported by morphological data a...

The first comprehensive revision of the Western Palaearctic species of the genus Dinotrema Foerster, 1862 is provided. 174 species of this genus are redescribed and illustrated. Ten species are described as new, viz, D. acompressum sp. nov., D. cahitum sp. nov., D. collybiae sp. nov., D. digitatum sp. nov., D. glabrideum sp. nov., D. helote sp. nov., D. lepiotae sp. nov., D. norwegicum sp. nov....

A new genus, Cradoscrupocellaria n. gen., is erected for Scrupocellaria bertholletii (Audouin, 1826), reported as widespread in tropical and subtropical waters. Here we select a neotype of this species in order to establish its identity and distinguish it from morphologically similar species. We include redescriptions and figures of additional species now assigned to this new genus: Cradoscrupo...