Clistoabdominalis Skevington, 2001 (Diptera: Pipunculidae) of Colombia, with description of a new species and an updated key to males of the Neotropical species.

Clistoabdominalis Skevington, 2001 has a cosmopolitan distribution and is a poorly studied genus of big-headed flies (Pipunculidae) in the Neotropical Region, completely unknown in Colombia. A new species is described from protected areas and conflict territories of limited access in Colombia, namely Clistoabdominalis lucyae sp. nov. (type-locality: Parque Nacional Natural Tayrona). Clistoabdominalis spinitibialis (Hardy, 1954) is recorded for the first time in Colombia, and an amended diagnosis provided. Illustrations and a dichotomic key to the Neotropical species of Clistoabdominalis are also presented.

Pipunculus Latreille, 1802 (Diptera: Pipunculidae) of Colombia, with description of three new species and an updated key to males of the Neotropical species.

Pipunculus Latreille, 1802 is a cosmopolitan genus of big-headed flies (Pipunculidae), with nine known species in the Neotropical region, but completely unknown in Colombia. Three new species of Pipunculus are described from Colombia, namely Pipunculus caeruleus sp. nov. (type-locality: Pramo de Santa Ins, Belmira), P. chiminiguagua sp. nov. (type-locality: Cabaa Chaina, Santuario de Fauna y Flora Iguaque) and P. planus sp. nov. (type-locality: Los Mudos, Santuario de Fauna y Flora Iguaque). Illustrations and a new dichotomic key to the Neotropical species are presented. This paper increases the number of Neotropical Pipunculus to 11, five in South America and three in Colombia, which is now the South American country with the highest diversity of this genus.

Cephalops Falln and Semicephalops De Meyer (Diptera: Pipunculidae) of Colombia, with description of five new species and an updated key to males of the Neotropical species.

The pipunculid genera Cephalops Falln, 1810 and Semicephalops De Meyer, 1994 are cosmopolitan in distribution. These two genera have just a few species known from the Neotropical Region and they were completely unknown to Colombia. Four new species of Cephalops and one species of Semicephalops are described from protected areas and conflict-territories of limited access in Colombia, namely Cephalops acutus sp. nov. (type locality: Caaveral, Magdalena), C. gracilis sp. nov. (type locality: El Nspero, Boyac), C. klinsmanni sp. nov. (type locality: Las Brisas, Caquet), C. lobatus sp. nov. (type locality: El Nspero, Boyac) and Semicephalops folium sp. nov. (type locality: Quebrada Carrizal, Boyac). With this paper, the number of Cephalops species from the Neotropical Region increase from 13 to 17 and that of Semicephalops from five to six. Cephalops amapaensis Rafael, 1990 and Semicephalops inpaganus Rafael, 1990 are recorded for the first time from Colombia, and amended diagnosis are provided for both. A dichotomic key to the Neotropical species of both genera is presented.

Basileunculus Rafael, 1987 (Diptera: Pipunculidae) of Colombia, with Description of Three New Species and an Updated Key to Males of the Neotropical Species.

Basileunculus Rafael, 1987 is exclusive of the Neotropical region and is a poorly studied group, completely unknown in Colombia. Three new species of Basileunculus are described from Colombia, namely Basileunculus elieceri sp. nov. (type-locality: Cabaña Chaina, Santuario de Fauna y Flora Iguaque), B. elongatus sp. nov. (type-locality: Santuario de Fauna y Flora Iguaque), and B. tayronensis sp. nov. (type-locality: Parque Nacional Natural Tayrona). Basileunculus rex Curran, 1934 is recorded for the first time in Colombia, with an amended diagnosis. Descriptions, illustrations, diagnosis, distribution maps of new species, and a dichotomic key for all of the Neotropical species are presented.

Four new species of Macrostomus Wiedemann and a checklist of Empididae s. str. (Diptera) from Peru.

Twelve Peruvian species of Macrostomus Wiedemann were studied. Macrostomus apicalis (Bezzi, 1909) is redescribed based on female holotype. Four new species are described: M. chelicercus sp. nov. (type-locality: Cuzco, Quincemil), M. contortus sp. nov. (type-locality: Cuzco, Quincemil), M. hyalopteryx sp. nov. (type-locality: Cuzco, Ttio) and M. unilineatus sp. nov. (type-locality: Junin, Oxapampa). A key to the 12 species of Macrostomus found in Peru is presented. A checklist of 50 known species of Peruvian Empididae s. str. is included. Atrichopleura schnusei Bezzi, 1909 is excluded from the Peruvian fauna.

A new genus and species of odiniids (Diptera: Odiniidae) from the canopy of the Brazilian Amazon rainforest.

Umbodinia bella gen. nov. et sp. nov. is described and illustrated from specimens collected in the canopy of an ombrophilous Amazonian forest, Manaus, Brazil. The genus is characterized by a unique combination of diagnostic features: body predominantly yellow; frons with two shiny dark brown to black lobules in lower corners, between the lunule and eye margins; lunule high-arched with two subtriangular spots covered with black pubescence; parafacial with tufts of long and strong setae, almost as long and stout as the fronto-orbital setae; and anepisternum with setulae dorsally and posteriorly, in addition to posterior setae.

Pauximyia, a new genus of Odiniidae (Diptera: Acalyptratae) with description of two new species from Brazil.

A new genus of odiniids (Odiniidae: Traginopinae) is described from Brazil, Pauximyia gen. nov., with two species, P. oliveirai sp. nov. (type species) and P. vidali sp. nov. A modified key to the Neotropical genera of the family and for the two Pauximyia gen. nov. species is provided.