We describe the second and third instars of Hydroporus zimmermanni J. Müller, 1926 on the basis of material collected from the type locality in Petelinsko Jezero, San Pietro del Carso (now Pivka) in present-day Slovenia. We also provide notes on its ecology and a key to the known third instars of Hydroporus Clairville, 1806, which have been described in much detail elsewhere. The larva of H. zimmermanni resembles those of other known species of the genus, but has a more elongate urogomphus.

A new discolomatid species, Fallia iviei Cline and Shockley, new species, is described from the Dominican Republic. A distribution map, habitus and character images, and discussion of its biology are provided. The new species represents the first known member of the genus from the West Indies. A species checklist for all nine described species of Fallia Sharp is presented.

Psychopomporus felipi Jean, Telles, and Miller, new genus and new species (Coleoptera: Dytiscidae), is described from San Felipe Springs, Val Verde County, Texas, USA, which emerges from the Edwards-Trinity aquifer system. Psychopomporus felipi shows several features typical of subterranean diving beetles, such as depigmentation, compound eyes reduced, elytra fused, and flight wings absent. Psychopomporus differs from other hydroporine genera in having a broad elytral epipleuron, the prosternal process small and with a medial, strongly produced prominence, and the meso- and (to a lesser extent) protibia apically broadly expanded and medially distinctly curved. This is the fourth stygobiontic diving beetle described from the Edwards-Trinity aquifer system in south-central Texas, USA.

Hoplopyga antilliana Ratcliffe, new species, is described from Grenada and Union Island in the Lesser Antilles. It resembles Hoplopyga liturata (Olivier) from Central and South America and is distinguished from that species. Species of Hoplopyga Thomson are known from Mexico to Argentina, but this species represents the first known occurrence for the genus in the West Indies.

Calomicrus jungchangi Lee and Beenen, new species, is described, and a similar species, Monolepta rufofulva Chûjô, 1938, is redescribed and a lectotype designated. Male and female reproductive systems are illustrated in detail. Calomicrus jungchangi is easily distinguished from other Taiwanese members of Calomicrus Dillwyn by its characteristic color. It inhabits marine shorelines, probably because of its close association with its host plant, Ipomoea pes-caprae subspecies brasiliensis (L.) van Ooststr.

The third instars of Pristerophora picipennis (Solier) and Schizochelus modestus Philippi (Scarabaeidae: Melolonthinae: Macrodactylini) are described and illustrated. The descriptions are based on larvae reared from eggs laid by adults in the laboratory and on larvae collected in the field. These are the first descriptions of larvae of Macrodactylini that live and feed in the root zone of pastures in southern Chile. The larvae of the two species can be distinguished easily by the presence (S. modestus) or absence (P. picipennis) of palidia. Also, setae on the dorsum and the dorsal anal lobe are sickle-shaped in S. modestus and short, slender, straight, and acute in P. picipennis.

Se describen e ilustran las características del tercer estadio de Pristerophora picipennis (Solier) and Schizochelus modestus Philippi (Scarabaeidae: Melolonthinae: Macrodactylini). Las descripciones se basan en larvas criadas desde huevos puestos por adultos en el laboratorio y en larvas colectadas del suelo bajo praderas. Estas son las primeras descripciones de larvas de Macrodactylini que viven y se alimentan de la zona radicular en las praderas del sur de Chile. Las larvas de ambas especies pueden ser fácilmente separadas por la presencia (S. modestus) o ausencia (P. picipennis) de palidia. También, en S. modestus las setas del dorso y lóbulo anal dorsal presentan forma de hoz y en P. picipennis son cortas, delgadas, rectas y agudas.

Cyclocephala mesophylla Mora-Aguilar and Delgado, new species, from the cloud forests in Oaxaca and Veracruz, Mexico is described and illustrated. The new species is compared with Cyclocephala batesi Delgado and Castañeda, and modifications of Endrödi's key to species in the genus are provided in order to include this new species. The previously unknown female of Cyclocephala berti Delgado is described.

The American burying beetle, Nicrophorus americanus Olivier, was listed as an endangered species in 1989 by the U.S. Fish and Wildlife Service. The recovery plan outlines the need for self-sustaining populations with at least 500 individuals, which requires mark and recapture sampling methods for measurement. To estimate populations, a marking technique must be used that will stay intact during the study and not adversely affect the beetle's behavior. Four marking techniques (bee tags, enamel paint, elytron-clipping, and elytron-cauterizing) have been used in studies involving the marking of N. americanus studies. In our study, we used two surrogate species, Nicrophorus marginatus F. and Nicrophorus orbicollis Say, to test these different marking techniques. There were no significant differences in mortality rates among the four techniques for mature or teneral beetles. Bee tags had a significantly higher retention rate than paint in day-to-day activities and during reproductive cycles. In a field study of N. americanus where bee tags and elytral cauterizing were used, bee tags had a loss rate of 19.7%. A combination of permanent marks and bee tags will allow researchers to perform more accurate population estimates as well as track individual beetles to gain knowledge of their ecology and biology.

This paper presents natural history observations on two species of the weevil genus Mononychus Germar (Coleoptera: Curculionidae) that feed on seeds of Iris L. in northeastern Turkey. The host plant of Mononychus schoenherrii Kolenati, 1859 is Iris iberica Hoffmann. Eggs are laid in seed capsules in which the larvae consume nearly all seeds in the capsule and pupate. Adults of the new generation emerge from the capsules and fly away for aestivation and hibernation. Mononychus punctumalbum (Herbst, 1784) develops on Iris spuria L. Similarly, eggs are laid in seed capsules in which a single larva consumes only two or three seeds, and later pupates in the capsule. New generation adults emerge from the seed capsules and hide in the soil litter for hibernation. Both species produce one generation per year.

This paper shows that for Onthophagus rhinolophus Harold inhabiting shade coffee plantations in central Veracruz, Mexico, frugivory is an alternative feeding strategy that is as important as coprophagy to adult feeding, nesting, and larval development. In this habitat, as is common in the humid tropical forests of the Neotropics where the droppings of medium-sized and large mammals are relatively scarce, the existence of frugivorous or copro-frugivorous species is one of the most important factors allowing for high Scarabaeinae species richness.