Micropotamia Carvalho, 1993

Type-species: Phaonia minuscula Albuquerque, 1955, by original designation.

Diagnosis. Male holoptic, eyes pubescent; female dichoptic. Fronto-orbital plate slender in both sexes; female with proclinate orbital seta. Gena narrow, at most 1/10 of head height, and with strongly inclined genal seta. Arista pubescent, setae shorter at base. Dorsocentral setae 2+3, pre-sutural acrostichal setae in 3 series; pre-alar seta 1. Notopleuron bare. Anepimeron bare. Posterior spiracle small in both sexes, smaller than base of halter, margin bare. Veins bare, except costa. Subcostal gently curved on apical portion. Mid femur on ventral surface with 1 preapical seta. Hind tibia on posterior portion with 2 preapical setae; posterodorsal seta well developed on apical third (calcar). Hind coxa bare on apical posterior margin. Pulvilli yellow and claws black. Abdomen with translucent yellow tergites 1+2 and 3. First abdominal sternite bare. Male terminalia: distiphallus with small denticles. Female terminalia: sternite 8 developed; cerci longer than the hypoproct; spermathecae 3.

Distribution. Brazil, Costa Rica, Mexico.

Considerations. The identification key includes the males of all species, and the females of only four, because the males of Micropotamia amazonica, M. fuscisquama, M. minuscula, and Micropotamia fortuna sp. nov. could be associated with their female counterparts.

Key to species of Micropotamia Carvalho

1. Male: frontal setae 3 (Fig. 1)............................................................................ 2

–. Male: frontal setae 4 (Fig. 2)............................................................................ 5

2. Male: hind femur without swelling on apical half; AV surface with 4 setae on apical half (Fig. 4). Female: unknown.................................................................................. M. cilitibia (Albuquerque, 1955)

–. Male: hind femur swollen on apical half, AV surface with 4 or more setae on apical half (Fig. 3)....................... 3

3. Male: hind femur on AV surface with 12 misaligned and curved setae on apical half (Fig. 5); V surface with 5 misaligned setae on apical half (Fig. 6). Female: unknown.......................................... Micropotamia ditissima sp. nov.

–. Male: Hind femur with AV surface bearing fewer than 12 setae on apical half; V surface with 3 aligned setae on apical half.. ................................................................................................... 4

4. Male: hind femur on AV surface bearing 4 setae on apical half (Fig. 7). Female: terminalia with segment 7 rectangular; sternite 8 long and narrow (Fig. 43).................................................. M. minuscula (Albuquerque, 1955)

–. Male: hind femur with AV surface bearing 6 setae on apical half (Fig. 8). Female: terminalia with segment 7 triangular; sternite 8 trapezoidal (Fig. 44)......................................................... Micropotamia fortuna sp. nov.

5. Male: hind femur with PV surface bearing 2 preapical setae (Fig. 9); AV surface with 6 setae on apical half, 4 apical setae stronger (Fig. 10). Female: unknown.............................................. Micropotamia ananas sp. nov.

–. Male: hind femur on PV surface without strong setae; AV surface with fewer than 6 setae on apical half................. 6

6. Male: hind femur on AV surface bearing 5 setae, the 4th seta more developed (Fig. 11). Fifth sternite with long and curved setae on posterior margin (Fig. 17). Female: yellowish postpronotal lobe. Base of tergite 6 oval (Fig. 41a).................................................................................... M. amazonica (Albuquerque & Lopes, 1982)

–. Male: hind femur with AV surface bearing 3 setae on apical third. Fifth sternite with short setae on posterior margin (Figs. 19 and 21). Female: postpronotal callus with same coloration as the rest of scutum. Tergite 6 rectangular.................. 7

7. Male: hind femur with PV surface bearing 1 preapical seta (Fig. 12). Fifth abdominal sternite of male with prominent and rectangular anterior margin (Fig. 21). Female: unknown............................... Micropotamia stellaria sp. nov.

–. Male: hind femur with PV surface bearing a series of setae. Fifth abdominal sternite of male rounded on anterior margin (Fig. 19). Female: oval epiproct (Fig. 42)................................................ M. fuscisquama (Wulp, 1896)