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Heteronotus mourei, sp.n. is described from Conde, Paraíba, Brazil.

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Amblycerus kingsolveri, sp. n. from Amazonas, Brazil and A. marinonii, sp. n. from Goiás, Brazil, are described and illustrated.

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A comparative study of some characters as: the lenght of the mesepisternal carina (almost complete or short), the shape of the scutellum (flattened or bilobed), and only in the male: the shape of the distal terga and of the sterna (normal or with some sterna hidden) and the lenght of the basal articles of the flagellum (short or longer than their diameter) resulted in distinguishing Anthidulum from Dicranthidium as good genera separated from Hypanthidioides Moure. Seven new species are described: Anthidulum christinae, sp.n. from Muzo, Colômbia; Anthidulum mourei, sp.n. from Ponta Grossa, PR, Brasil; Anthidulum cavichiolii, sp.n. from Cáceres, MT, Brasil: Anthidulum zanolae, sp.n. from Araxá, MG, Brasil; Dicranthidium luciae, sp.n. from Maracás, BA, Brasil; Dicranthidium soniae, sp.n. from Rep.R Grande, GB, Brasil and Dicranthidium insulare. sp.n. from San Rafael, Trinidad. Keys for the identification of the species of Anthidulum and Dicranthidium are included.

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Along ten years of study of a common dolphin from the brazilian coast, Sotalia brasiliensis Van Beneden, 1874, I could see some occasions of feeding associations of this dolphin with five species of birds, Sula leucogaster (Boddaert, 1783), Fregata magnificens Mathews, 1914, Sterna hirundinacea Lesson, 1831, Larus dominicanus Lichtenstein, 1823 and Phalacrocorax olivaceus Humboldt, 1895. The commonest association observed was between the dolphin and S. leucogaster, and in all the associations was characterized the commensalism, with advantaged to the birds.

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Descriptions of larval and pupal stages of Psylotoxus melanospidus Giacomel, 1991 are given. A short account on the biology of species growing in Bauhinia (Leguminosae), is also included.

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A concise description and a latitudinal distribution to South Brazil of Calappa sulcata are presented.

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Studies on the growth of the blue crab C. danae were carried out by the analysis of size-frequency distributions, and the growth curves were determined for both sexes through Bertalanffy equation. 613 males and 511 females were obtained from 10 collecting sites of the lagoon, at night, monthly from January/88 to July/89. The growth curves in carapace width were described according to the following equations: Wid∞ = 14.0 (1-e-0,6975.t) for males and Wid∞ = 13.3 (1-e-0,6555.t) for females. The growth curves in body weigth were also determined, based on the equations of the growth curves and the relationship between body weight and carapace width. The equations are:Wt = 156.9 (1-e-0,6975.t)2.9153 for males, Wt = 134.0(1-e-0.6555.t)2.8994 for females.

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The genus Megabahita Linnavuori & DeLong, 1978 is redefined based on the type species, M. irrorata (Osborn, 1923). A checklist is added and three new species are described: M. mineira sp.n., M. danunciae sp.n. and M. spatulata sp.n., all from Brazil.

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A list of Butterflies threatened with extinction in Paraná is presented. It includedes 17 specimens with geographic distribution, brief description, habitat and behaviour.

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Histological changes in the oocyte development of South American lungfish are described. During maturation, pre-vitellogenic and vitellogenic phases could be distinguished, and they are similar to those of teleost fishes.

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The female of Onega bracteata Young, 1977 is described by once first. The specimen was colleting in Peru.

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Data on relative importance of rare and common bee species in some holarctic and neotropical limited sites are presented. The density distribution patterns in samples from all analyzed assemblages is characterized by a relatively large number of species represented by few individuals and few species with large number of individuals, as in most animal communities.

Resumen en Inglés:

Seventeen clones of Rhopalosiphum padi (Linnaeus, 1758), 14 of R. maidis (Fitch, 1856), and two of R. insertum (Walker, 1849), representing a wide range of host plants and geographic distribution, were examined electrophoretically to determine intra and interspecific variation. Twenty-one enzyme systems were tested using starch-gel techniques. The electromorph variation within species was low, as expected for parthenogenetic organisms. Frequency of heterozygotes was also relatively low for most populations. The percentage of polymorphic loci ranged from 0% to 27.3% in R. padi, but it was lower (0% to 18.2%) in the completely an holocyclic R. maidis. No consistent correlation between band patterns and host plant or geographic origin could be established for R. padi and R. maidis. The distinction between R. padi and R. insertum was made by Est-1, Lap-2, Pgm, Got-1,and α-gpdh.The enzymes Est-2, G-3pdh, Sdh, and Got-2 were useful to separate R. maidis from R. padi, while Est-1, Lap-2, Got-1, and α-gpdh, in addition to the first three mentioned above, separated R. maidis from R. insertum. However, many other loci shared only one electromorph and had another that was useful to partially distinguish the species. The utilization of starch-gel electrophoresis as a taxonomic tool in distinguishing populations and species of aphids and its combination with other taxonomic methods are briefly discussed.

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Oxaea mourei, sp.n is described, from Paraná State, Brazil. This new species is most closely related to O. schwarzi. They may be easily distinguished from each other since the hairs in O. mourei are yellow-golden while those of O. schwarzi are mostly black. The eyes of the male in O. schwarzi are strongly convergent above and those of O. mourei are weakly diverging above.

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Adult, larva and pupa of Calyplocephala paralutea, a new species of Cassidinae, Spilophorini (Coleoptera, Chrysomelidae), from Porto Platon, Amapá, Brazil, is described.