The second part of the world catalogue of Gonocephalum Solier, 1834 contains the list of the type species preserved in the Hungarian Natural History Museum (Hungary, Budapest), the list of the papers on Gonocephalum species and additional data for 95 species and subspecies. At present, 417 species and subspecies belong to the genus Gonocephalum.

A new species of the genus Opatrum Fabricius, 1775, 0. (Opatrum) malgorzatae sp. nov., is described from Corsica. It is compared to its Sardinian endemic relative O. (Opatrum) dahli Küster, 1849. Photographs of habitus and aedeagus of both species are presented.

The catalogue of all known World species of the subtribe Melambiina Mulsant et Rey, 1854 is presented: 24 genera, 195 species and subspecies are listed. The data of primary types is included. Distribution for known species and subspecies is listed and presented on the maps.

Cylindrinotus tchorokhicus sp. nov. and Probaticus (Pelorinus) banaszkiewiczae sp. nov. are described from northeastern Turkey (Artvin Province). The first species is similar to C. constrictus (Seidlitz, 1896), but differs from it by flattened lateral sides of pronotum, strongly thickened outer margins and base of pronotum, more shining body and structure of aedeagus. The new species of Probaticus Vauloger, 1900 is close to P. corrugatus (Seidlitz, 1896), but differs from it by the structure and punctation of pronotum and propleura, structure of elytra and genitalia of male, and pubescence on anal sternite.

Review of the O. korbi species-group is given. 5 species and 1 subspecies, including four new taxa are known from Southern Anatolia: O. korbi (Reitter, 1902), O. perarmatus Nabozhenko et Tichý, 2006, O. svetlanae sp. nov. svetlanae subsp. nov., O. svetlanae beydagensis subsp. nov., O. nasreddini sp. nov., O. malgorzatae sp. nov. Morphological characters of species-group, bionomics and distribution are discussed.

Crypsis malgosiae sp. nov. from China (Sichuan) is described. New records of known species are presented, significantly expanding the known distribution of the genus (now 20 species). For most species photographs and drawings of the aedeagi are added for the first time to facilitate subsequent identifications.

Donaciolagria malgorzatae sp. nov. from Laos and Thailand is described. New country and new Chinese province records of formerly described species of Donaciolagria Pic, 1914 are given.

Three new species of the Australian genus Myrabolia (M. championi, M. malgosiae, M. weiri) are described, diagnosed and illustrated. The key to the known species of the genus is updated.

Calodromus kosteliae sp. nov. from Malaysia is described based on a single male specimen. The new taxon is closely related to Calodromus vethi Kleine, 1915 but can be distinguished by the different shape of the hind legs and by the absence of an apical tubercle on the first tarsal article of the male posterior legs. Calodromus malgosiae sp. nov. from Myanmar is also described based on a single male specimen; it is close to Calodromus amabilis Kleine, 1916 but can be distinguished by the different shape of the hind legs and by the absence of a tuft of hair on the apical tubercles of the first tarsal article of the male posterior legs. The following new synonymy is also established: C. horishanus Kano, 1930 = C. ito Heller, 1910. A key is provided for the identification of the males of the known species of Calodromus Guérin-Méneville, 1832. Some locality records are provided; Calodromus simplex Heller, 1910 and Calodromus amabilis Kleine, 1916 are recorded for the first time from Malaysia.

The first, second and third larval instars of Agyrtodes crassus and an unknown species of Zearagytodes, and the third instar of Dictydiella turneri are described in detail, illustrated and measured. The details of their chaetotaxy and porotaxy are provided. Larval characters of Dictydiella leleupi are compared with those of D. turneri. Morphological and chaetotaxic differences among mature larvae of the Agyrtodini genera Agyrtodes, Cholevomorpha, Dasypelates, Dictydiella, Eupelates, Paragyrtodes, Ragytodina and Zearagytodes are summarized. New morphological characters of Leiodidae larvae are documented and discussed.

Notosacantha banaszkiewiczae from Vietnam and Notosacantha mentawaiensis from Mentawai Is., new to the science, are described and figured.

A new stygobite species Acanthocyclops transylvanicus sp. nov. is described from the north-western Romanian Carpathians (Apuseni Mountains) and is accommodated in the subterranean kieferi-group. Acanthocyclops transylvanicus sp. nov. resembles closely A. biarticulatus Monchenko, 1972 in the segmentation pattern of the swimming legs (3.2/3.2/3.2/3.2), but differs by the following characters: antennary second endopodite segment with 7 setae; distal articles of endopodites of P1 and P3 with 4 and 5 setae, respectively; absence of coxopodite ornamentation pattern in leg 4; leg 4 endopodite with 3-segmented appearance, but lacking a functional articulation between the second and third segment. We assume that the 2-segmented nature of the leg 4 endopodite as observed in both species is a convergent acquisition. The adult shape of the leg 4 endopodite in A. transylvanicus sp. nov. results from the simple suppression of an arthrodial membrane formation. A. transylvanicus is the ninth representative known in Romania which is accommodated in the kieferi-growp. An identification key for the species of kieferi-growp known to occur in Romania is given.