This revision of the subgenus Marmaraeschna includes the description of three new species: Aeshna (M.) fissifrons, A. (M.) obscura and A. (M.) brevicercia, as well as redescriptions of the previously known species, including the first description of the male of A. (M.) pallipes, a key for males and females and an updated distribution for each…
Aeshna (Hesperaeschna) condor sp. nov. is described and illustrated from four males and six exuviae. The adult color pattern does not resemble that of any other Venezuelan species, but structurally the new species comes closest to A. (H.) punctata and A. (H.) joannisi. This latter is here recorded for the first time from Venezuela, and…
Trithemis bifida is reported for the first time from East Africa. Previously there were only two Afrotropical records of this species: one male from Zambia and one male from the Ivory Coast. The male of T. bifida is described and compared with the closely related T. donaldsoni which is also found in East Africa. Taxonomically…
It is often assumed that males do not choose among females because competition for partners is high and male mating costs are low. Nevertheless, this assumption does not always hold. In some species duration of copulation is long, possibly causing a limitation on the lifetime number of matings for males. In this case we expect…
A brief Odonata survey in southern Florida, USA, in January 2000 resulted in the discovery of two new species, Chrysobasis lucifer and Nehalennia minuta, for the USA and established populations of two other species, Tholymis citrina and Tramea calverti, that had been considered vagrants. Flight seasons of six additional species were extended. These records are…
Pseudagrion lalakense, a new species of coenagrionid from Borneo, is described and figured. The species is phylogenetically close to the very widespread and eurytopic P. microcephalum and the two fly together. P. lalakense may be distinguished from microcephalum and several other similar blue species by the pattern on the thorax and abdomen in both sexes…
A small inconspicuous spine, first detected at the base of the distal-most seta on each labial palpus of early stadia of two species of Enallagma, is reported to occur in final-stadium (F-0) larvae of Palaearctic and Nearctic E. cyathigerum, in F-0 of 31 other Nearctic species of Enallagma and in F-0 of three other coenagrionid…
Although there are many records of Orthetrum coerulescens in Bulgaria, the presence of the nominotypical subspecies is doubtful. A critical analysis of all specimens available revealed that they belong either to O. c. anceps or to intermediate forms, but not to O. c. coerulescens. The latter taxon is therefore omitted from the Bulgarian species list,…
The microdistribution patterns of larval Gomphus graslinii and Oxygastra curtisii in three rivers in southern France were studied. While G. graslinii was caught mainly in sandy reaches covered with leaf litter, O. curtisii was found almost exclusively clinging to alder roots at the river margins. Preferences of habitat structure were determined from habitat selection experiments…
Predation of aggregated, ovipositing tandems of Sympetrum sanguineum and S. vulgatum by the hornet Vespa crabro was observed in Belarus. The same species of hornet was seen killing territorial males and copulating females of Calopteryx haemorrhoidalis in Italy. Numerous remains of these odonates at the oviposition sites suggest that attacks occur frequently. A short review…