Rhectomia Moure, 1947

ENGEL, MICHAEL S., 2000, Classification Of The Bee Tribe Augochlorini (Hymenoptera: Halictidae), Bulletin of the American Museum of Natural History 2000 (250), pp. 1-89 : 54-55

Genus Rhectomia Moure

Rhectomia Moure, 1947: 9 . Type species: Rhectomia pumilla Moure, 1947 , monobasic and original designation.

Corynurella Eickwort, 1969a: 398 . Type species: Corynurella mourei Eickwort, 1969a , monobasic and original designation.

DIAGNOSIS: Rhectomia is most closely related to Rhinocorynura . The genus differs from Rhinocorynura by a broadly rounded mesoscutal anterior margin, a rounded mesoscutal lip, and the absence of clypeal armature and the anterior basitarsal brush.

DESCRIPTION: Female. Mandible with weak subapical tooth. Labral distal process narrowly triangular; basal elevation bilobed or orbicular; teeth absent. Prementum not greatly elongate. Galeal apex rounded; galeal comb present; galeal base extending only halfway to stipital base. Hypostomal ridge carinate; anterior angle rounded. Length of malar space less than basal mandibular width. Epistomal sulcus obtuse. Ocelli not greatly enlarged; ocellar furrow absent. Vertex expanded behind ocelli. Preoccipital ridge rounded. Pronotal lateral angle produced, orthogonal to obtuse; dorsal ridge carinate, usually with medial interruption separating dorsal ridge into anterior and posterior halves on different planes; lateral ridge angled or carinate. Mesoscutal anterior border rounded; mesoscutal lip rounded. Tegula oval. Anterior basitarsal brush absent. Basitibial plate bordered on all sides. Inner hind tibial spur pectinate. Apex of marginal cell acute. Distal hamuli with irregular spacing pattern. Basal area of propodeum smooth or very finely striate; propodeal pit narrow. Male. Mandible simple. Labrum without distal process; basal area not notched. Antenna extending back to scutellum; F2 roughly equal to F1. Inner hind tibial spur serrate. Metasoma elongate. S4 unmodified. Apical margins of S5 and S6 emarginate. Apical margin of S7 unmodified. Apical margin of S8 unmodified; spiculum narrow. Proctiger with microtrichial fringe. Gonobasal bridge broad; dorsal lobes strong. Basal process of gonostylus present; parapenial lobe absent. Ventral surface of penis valve unmodified.

REVISIONS: The genus was recently treated by Engel (1995b) who recognized four spe- cies and presented a key for their identification.

BIOLOGY: Nothing is known of Rhectomia biology, although the head size polymorphism present in at least one species ( R. harrisoni Engel ) suggests the possibility of social behavior.

DISTRIBUTION: Species of Rhectomia occur in northern Argentina, southern Brazil, Bolivia, Paraguay, and southern Peru.

Genus Rhinocorynura Schrottky Figures 2 , 18 , 31, 33 , 35 , 74–75

Corynura (Corynuropsis) Cockerell, 1901: 220 . Type species: Corynura (Corynuropsis) darwini Cockerell, 1901 [= Augochlora briseis Smith, 1879 ], original designation. Nomen praeoccupatum (nec Corynuropsis Scott, 1894 [Crustacea: Entomostraca]).

Rhinocorynura Schrottky, 1909a: 147 . Type species: Halictus ( Corynura vel Corynuropsis) inflaticeps Ducke, 1907 , monobasic and original designation.

Ctenocorynura Schrottky, 1914: 628 . Type species: Ctenocorynura vernoniae Schrottky, 1914 [= Halictus ( Corynura vel Corynuropsis) inflaticeps Ducke, 1907 ], monobasic and original designation.

Corynuroides Sandhouse, 1943: 540 . Nomen novum pro Corynuropsis Cockerell, 1901. Type species: autobasic with Corynuropsis Cockerell, 1901.

Rhynocorynura Sakagami and Moure, 1965: 303. Nomen emendatum (unjustified).

DIAGNOSIS: Refer to Diagnosis for Rhectomia .

DESCRIPTION: Female. Mandible with strong subapical tooth. Labral distal process broadly triangular; basal elevation bilobed; teeth absent. Prementum not greatly elongate. Galeal apex rounded; galeal comb present; galeal base extending only halfway to stipital base. Hypostomal ridge carinate or weakly lamellate; anterior angle rounded. Length of malar space less than basal mandibular width. Clypeus frequently with armature of some design. Epistomal sulcus obtuse. Ocelli not greatly enlarged; ocellar furrow absent. Vertex expanded behind ocelli. Preoccipital ridge rounded (except one species is carinate). Pronotal lateral angle produced, orthogonal to obtuse; dorsal ridge lamellate; lateral ridge angled. Mesoscutal anterior border narrowed; mesoscutal lip la- mellate. Tegula oval. Anterior basitarsal brush present. Basitibial plate bordered on all sides. Inner hind tibial spur pectinate. Apex of marginal cell acute. Distal hamuli with irregular spacing pattern. Basal area of propodeum smooth. Male. Mandible simple. Labrum with distal process; basal area not notched. Antenna extending back to scutellum; F2 approximately equal in length to F1. Inner hind tibial spur serrate. Metasoma elongate. Apical margins of S4 and S5 unmodified. Apical margin of S6 emarginate. Apical margin of S7 with median projection. Apical margin of S8 unmodified; spiculum narrow. Proctiger with microtrichial fringe. Gonobasal bridge broad; dorsal lobes weak. Basal process of gonostylus present; parapenial lobe present or absent. Ventral surface of penis

valve with keel.

REVISIONS: There has been no revision of the genus, which currently includes five described species.

BIOLOGY: The nesting biology of one species, R. inflaticeps (Ducke) , was investigated by Eickwort and Sakagami (1979).

DISTRIBUTION: Species of Rhinocorynura occur in northern Argentina, southern Brazil, Bolivia, southern Ecuador, Paraguay, and Peru.

Figures

Figs. 1–6. Heads of Augochlorini, frontal aspect. 1. Thectochlora alaris (Vachal), female. 2. Rhinocorynura briseis (Smith), female. 3. Megommation (Cleptommation) minutum (Friese), female. 4 Chlerogella sp., female. 5. M. (Megaloptina) ogilviei (Cockerell), female. 6. Megalopta (Megalopta genalis Meade-Waldo, male.

Figs. 17–20. Labra of female Augochlorini. 17. Augochlora (Augochlora) pura (Say). 18. Rhinocorynura briseis (Smith). 19. Megalopta (Megalopta) genalis Meade-Waldo. 20. Temnosoma metallicum Smith.

Figs. 30–33. Mesosomae of female Augochlorini. 30. Temnosoma metallicum Smith, profile. 31 Rhinocorynura briseis (Smith), profile. 32. Mesoscutum of Megommation (Cleptommation) minutum (Friese), dorsal aspect. 33. Mesoscutum of R. briseis, dorsal aspect, pronotal dorsal lamellae evident on upper corners of mesosoma.

Figs. 34–37. Characteristics of female Augochlorini. 34. Tegula of Augochloropsis (Paraugochloropsis) sumptuosa (Smith), depicting notch on inner posterior margin. 35. Tegula of Rhinocorynura briseis (Smith). 36. Distal hamuli of hind wing of Megalopta (Megalopta) genalis Meade-Waldo. 37. Distal hamuli of Chlerogella sp.

Figs. 72–77. Male genitalic structures. 72. Genital capsule of Thectochlora alaris (Vachal), ventral aspect. 73. Genital capsule of Megalopta (Megalopta) genalis Meade-Waldo, ventral aspect. 74. Genital capsule of Rhinocorynura briseis (Smith), ventral aspect. 75. Gonocoxite-gonostylus junction in R. briseis depicting basal gonostylar process on ventral surface, process with strong setae at apex. 76. Penis valve of Temnosoma metallicum Smith, profile, with large dorsal processes. 77. Basal gonostylar process of Corynura (Callistochlora) prothysteres (Vachal) lacking setae, partially hidden by setose ventral