The genus Listroptera Audinet-Serville (type species Callidium tenebrosum Fabricius) is revised and the following species redescribed: L. tenebricosa (Olivier) and L. carbonaria Chevrolat. Aguassay, new genus, is described based on Cerambyx collaris Klug, up to now belonging to Listroptera. Aguassay collaris (Klug), new combination, is redescribed and its geographical distribution widened. A key to recognize the neotropical genera Dihammaphora Chevrolat, Haenkea Tippmann, Listroptera Audinet-Serville and Aguassay, all of which form a homogeneous group within the tribe Cleomenini, is also included.

New species of Phyllophaga (s.str.) are described from 12 Costa Rican localities as follows: P. tilarana new species, P. tapantina new species, P. talamancana new species, P. guapiloides new species, and P. puntarenosa new species from Cartago y Puntarenas provinces; P. naranjina new species, and P. lorencita new species from Alajuela and Cartago provinces. Most of these species are from submontane rain forests located between 800 and 1,750 m of altitude; P. talamancana and P.naranjina were collected in grasslands or coffee plantations, and P. puntarenosa was collected between 50 and 1,200 m of altitude in areas including tropical deciduous forests. Drawings of male genital capsules, female genital plates and tarsal claws are provided.

The mature larvae of Phaedon (Orthosthica) semimarginatus affinis Guérin is described and illustrated. This larva shares several morphological features with other members of the genus. It is similar to P. concinus Stephens and P. conchleariae (F.) in that tubercles Es and Ss are fused on meso and metathorax and the absence of Dae in segments 1–6. Frontal setae (f 2) are absent on larvae of P. (O.) s. affinis, tubercles Dai and Dae are separated on meso and metathorax, and only tubercle Dai is present on abdominal segments 1–3. Natural history is also discussed.

In Venezuela Amblycerus crassipunctatus Ribeiro-Costa feeds in seeds of Vantanea minor Bentham, Humiriaceae, a new host family for the Bruchidae. Species of Amblycerus Thunberg now are known to feed in from 11 to 14 families of plants, more than any other bruchid genus. Ecological relationships of A. crassipunctatus with its host were compared to A. nigromarginatus (Motschulsky), A. luteonotatus (Pic), A. dispar (Sharp), A. guazumicola Kingsolver and Johnson, A. vitis (Schaeffer), A. acapulcensis Kingsolver, A. robiniae (Fabricius), A. hoffmanseggi (Gyllenhal), A. testaceus (Pic), A. submaculatus (Pic), A. cistelinus (Gyllenhal), A. longesuturalis (Pic), and A. schwarzi Kingsolver and their hosts. A. crassipunctatus damaged 28.5% to 39% of V. minor fruits examined. In other species of Amblycerus where these figures are available, from 01.0% to 61% of the fruits were damaged. We found that eggs of almost all of the species discussed have a similar flange with glue on the periphery. This kind of attachment may prevent the egg from becoming detached from the fruit as it matures and during eclosion of the first instar larva or protect eggs against mechanical injuries. Larvae of most species of Amblycerus feed in several seeds during their development, but A. dispar and A. vitis feed in only one seed. Apparently almost all species of Amblycerus spin a cocoon for pupation. This was evolved probably because the large size of the adults led to the habit of feeding in several seeds. Most bruchids are much smaller in body size than species of Amblycerus and thus pupate inside a single seed that negates the need for a cocoon.

Four species are added to the genus Dilophochila Bates (Melolonthidae: Rutelinae: Anomalini). The new species are: D. brevisetosa new species from pine and oak forests near San Cristóbal de las Casas, Chiapas, México; D. gilli new species from pine forest at Cerro Uyuca, F. Morazán, Honduras; D. miahuatleca new species from oak and pine forests in the southern mountains of Oaxaca, México; and D. zacapana new species from pine forest near San Lorenzo, Zacapa, Guatemala. These species are described, illustrated, and a key is presented for all six known species in the genus.

Cononotus lanchesteri Van Dyke is recorded from the Hanford Nuclear Site (Benton County), Washington State. Eight specimens were collected in pitfall traps during a 16 month survey of an extensive sand dune area, primarily in the spring. Notes on habitat are presented.

Egidyella arcana Beal and Zhantiev, new species is described from an area adjacent to sand dunes in Kern County, California. It is compared with the only other known species in the genus, E. prophetea Reitter, which occurs in Central Asia. New definitions are provided for the genus and for the tribe Attagenini.

The cassidine genus Acromis Chevrolat is revised. A key for identification of adults, illustrated descriptions and extensive distribution data for the three species are provided. Eggs and mature larvae of A. spinifex (Linnaeus) are redescribed. A cladistic analysis of species based on 19 morphological characters is done using the stolaine genera Omaspides Chevrolat and Echoma Chevrolat, as well as Delocrania cossyphoides Guerin (Delocraniini) and Himatidium capense Herbst (Imatidiini) as outgroups. The resulting single most parsimonious tree (steps = 20; CI = 87; RI = 90) provides strong support for resolution within Acromis. Biological implications are discussed in light of the cladogram.

Platycoelia bicolor (Gutiérrez) (Scarabaeidae: Rutelinae) is transferred from the tribe Anoplognathini, subtribe Platycoeliina, to the tribe Rutelini. Platycoelia bicolor is placed in the genus Eremophygus Ohaus and the taxonomic history of the species is discussed. The transfer creates a new combination, Eremophygus bicolor (Gutiérrez) and places the generic name Heterocallichloris Gutiérrez as a junior synonym of Eremophygus (new synonymy). Morphological characters that warrant the transfer are discussed.

Four species are recognized within the Agabus (Gaurodytes) brunneus group, A. brunneus (Fabricius), A. didymus (Olivier), A rufulus Fairmaire and A. ramblae new species, from the eastern Iberian peninsula and the Balearic Islands. Agabus brunneus, A. rufulus and A. ramblae form a complex of closely related species distinguished mainly by aedeagal characters. A key of the species of the A. brunneus groups is provided, as well as some information about the known distribution, habitat and ecology of A. ramblae.

Notiobia cephalus (Casey) is recognized as a valid species, supported by external morphological differences and allopatric distribution. This Floridian precinctive species was previously considered to be conspecific with N. nitidipennis (LeConte), which ranges from Texas to southern Ontario and Quebec. The name N. tenuitarsus (Casey) is removed from synonymy with N. nitidipennis and is considered to be a junior synonym of N. cephalus.