JEAN BELLE Velp, The Netherlands PROGOMPHUS NIGELLUS AND PHYLWCYCLA H A MATA, TWO NEW DRAGONFLIES FROM BRAZIL (ODONATA: GOMPHIDAE) Belle, J., 1990. Progomphus nigellus and Phyllocycla hamata, two new dragonflies from Brazil (Odonata: Gomphidae). -Tijdschrift voor Entomologie 133: 27-30, figs. 1-10. [ISSN 0040-7496]. Published 31 July 1990. Descriptions and illustrations are given of two new species of Gomphidae (Odonata) from Brazil, viz. Progomphus nigellus and Phyllocycla hamata. Both male holotypes were col-lected in Brazil, State of Rondonia, Fazenda Rancho Grande. Correspondence: Dr. J. Belle, Onder de Beumkes 35, 6883 HC Velp, The Netherlands. Key words. — Brazil; Progomphus, Phyllocycla; new species. Introduction To the courtesy of Dr. Rosser W. Garrison at Azusa, California, I had the pleasure of receiving for description two new gomphid species which he had collected himself during his investigations in the area southwest of Ariquemes in the State of Ron-donia, Brazil. The material in question consists of three males; the corresponding females still remain to be discovered. The new taxa are here published under the names Progomphus nigellus and Phyllocycla hamata. The holotypes are deposited in the National Museum of Natural History, Smith-sonian Institution, Washington, D.C.; the paratype is in the collection of Dr. Garrison. Progomphus nigellus spec. nov. (figs. 1-6) Material. — Brazil: State of Rondonia, Fazenda Rancho Grande, 62 km SW of Ariquemes (10° 50' S, 63° 7'W, 187 m), 2-11 November 1989, 1 S (holotype), R. W. Garrison. This species is the fourth member of the guyanensis group to which also belong Progomphus guyanensis Belle, 1966, Progomphus approximatus Belle, 1966 and Progomphus boli-viensis Belle, 1973. The males of this infrageneric group differ from those of the closely allied complicatus-group in having the superior anal ap-pendages armed with a sharply-pointed basal ex-terno-lateral dilatation. Progomphus nigellus is perhaps as nearly related to Progomphus boliviensis as to the other two members of the group. The male superior anal appendages are similar to those of boliviensis, the inferior anal appendage approaches more that of approximatus while the anal tubercles resemble those of guyanensis. The morphological differences and similarities in the terminalia of the abdomen will be seen by comparing the figures of the present species with the corresponding ones of the other three members earlier published by me (Belle 1966, 1973). In order not to tamper with the unique specimen I have studied the accessory genitalia in situ. This can easily be done because the posterior hamules are in a somewhat extruded position. The accessory genitalia then exhibit a great resemblance to those of boliviensis. Male (holotype). — Total length 38 mm; abdo-men (incl. app.) 29 mm; hind wing 22.5 mm; costal edge of pterostigma of fore wing 2.7 mm. Smaller and more delicate than the other mem-bers of the group. Coloration done in black, brown and greenish white (= pale) but the pale markings on the abdomen are yellow. Face predominantly pale, slightly tinged brown at posterior parts of labrum and postclypeus. Superior surface of frons and occipital plate pale. Vertex brown. Rear of head brown with a pair of small submedian pale spots on top and a pair of larger pale markings on temporae. Crest of occiput slightly and evenly concave, thinly fringed with pale hairs which are about as long as half the middorsal length of the occipital plate. Prothorax with pale middle lobe and black hind lobe. Thoracic colour pattern black with pale mark-ings, resembling that of boliviensis but with metep-imeral pale stripe partly developed and interrupted in middle (fig. 1). Legs dark brown but inner side of first femora pale and second and third femora becoming lighter brown toward the bases. 27
A synopsis of the species of Phyllocycla Calvert, with descriptions of four new taxa and a key to the genera of Neotropical Gomphidae (Odonata,
Gomphidae)
BioStor
