In North America, the tribe Cholevini (Coleoptera: Leiodidae) is composed of the genera Prionochaeta Horn with 1 species, Catoptrichus Murray with 1 species, Sciodrepoides Hatch with 3 species, and Catops Paykull with 17 species. The species are mostly forest inhabitants that feed on carrion and other decaying materials, but some occur in tundra habitats, in caves, and in rodent burrows. Resurrected status is proposed for Sciodrepoides terminans (LeConte). The subspecies status of Sciodrepoides watsoni hornianus (Blanchard) is not supported. Lectotypes are designated for Catops terminans LeConte (= Sciodrepoides terminans (LeConte)), Choleva gratiosa Blanchard (= Catops gratiosus (Blanchard)), and Choleva egena Horn (= Catops egenus (Horn)). Neotypes are designated for Catops simplex Say and Catops basilaris Say. Catops luteipes Thomson is reported from North America for the first time. New species are Sciodrepoides latinotum Peck and Cook sp.nov., Catops paramericanus Peck and Cook sp.nov., Catops apterus Peck and Cook sp.nov., and Catops meridionalis Peck and Cook sp.nov. Four Catops species are Holarctic in distribution, whereas the others are restricted to North America, south to Mexico.

No abstract

The Canadian Entomologist 130: 615 -629 (1998) Relatively little information concerning the cuticular hydrocarbon composition of aquatic insects is known. The cuticular hydrocarbons of the aquatic beetle Agabus anthracinus Mannerheim have been identified with the aid of a gas chromatograph coupled to a mass spectrometer. The cuticular hydrocarbon profile comprises nalkanes (46.8%), n-alkenes (27.1%), and methylalkanes (25.9%) and is basically similar to that of terrestrial Coleoptera. However, the hydrocarbons of A. anthracinus differ in that (i) the shorter chain n-alkanes are present in higher proportion, (ii) there is a relatively lower abundance of methylalkanes, and (iii) the proportion of n-alkenes is significantly higher. Alarie, Y., H. Joly et D. Dennie. 1998. Analyse des hydrocarbures cuticulaires du coleoptkre aquatique Agabus anthracinus Mannerheim (Coleoptera : Dytiscidae). The Canadian Entomologist 130: 615-629. La composition en hydrocarbures cuticulaires des insectes aquatiques demeure inconnue. Cet expos6 identifie les hydrocarbures de la cuticule d'Agabus anthracinus Mannerheim, un colCoptkre aquatique, a l'aide d'un chromatographe en phase gazeuse coup16 a un spectromktre de masse. Les donnCes dCmontrent que la cuticule d'A. anthracinus est composCe de n-alcanes (46,8%), de n-alcknes (27,1%) et de mCthylalcanes (25,9%) ce qui est fondamentalement semblable B la condition ob-servCe parmi les col6optkres terrestres. Les hydrocarbures d'A. anthracinus se distinguent cependant (i) par une plus grand abondance de n-alcanes B chaine courte, (ii) une moins grande abondance de mCthylalcanes et (iii) un pourcentage de n-alcknes significativement ClevC. Volume 130 ~I E CANAD~AN E~TOMOLOGIST 617

A vehicle-mounted net (“car-net”) is a useful tool to sample flying beetles or other insects. Previous authors have used nets on top of the vehicle. A net mounted lower and in front of the vehicle is thought to be superior for catching beetles which fly closer to ground level. Quantified results are given.

The endemic Galápagos’ genus Neoryctes Arrow has had a confused nomenclatorial and taxonomic history. Evaluation of morphological variation in the 41 specimens now available confirms the distinctiveness of the genus and establishes the existence of four species, each restricted to a single island. The original Darwin specimen, named Oryctes galapagoensis by G.R. Waterhouse in 1845, is shown to be from Isla Santiago. Two other names are valid: N. linelli Mutchler for the population on San Cristobal and N. moreti Dechambre for the one on Santa Cruz. The population on Floreana is named as a new species, N. williamsi. Neoryctes most likely originated from a Pentodontini dynastine ancestor from lowland South or Central America. The ancestor first dispersed to Isla San Cristobal, one of the oldest islands. It is hypothesized that before hindwing reduction occurred, which is now characteristic of all members of the genus, individuals from San Cristobal spread to the other islands. Subsequently, possibly during periods of Pleistocene aridity, each population became restricted to its present range in the moist highland zone of an individual island.