DUEHAM DIPTEEA. 59 



VI. 82. 



51 (56). V.4. dividing at or before X.4. 



52 (53). Dorsum brown. Antennae black. 



(563. neglectus, Winn.) 



53 (52). Dorsum black. Antennae brown. 



54 (55). Dorsum shining black, with shining white hairs. 



(544. titillans, Winn.) 



55 (54). Dorsum matt black with black hairs. 



(545. velox, Winn.) 



56 (51). V.4. dividing some distance beyond X.4. 



57 (58). Entirely orange species. (565- ockraceus, Winn.) 



58 (57). Spe*cies with at least the thorax black or dark. 



59 (60) (61) Palpi and antennae black. Dorsum matt dark- 



grey with five black stripes. (560. cestivus, Winn.) 



60 (59) (61). Palpi brown. Antennas pale brown with snow- 



white shimmer. Dorsum dark brown, not striped. 



(553* amcenus, Winn.) 



61 (59) (60). Palpi yellow. 



62 (63). Abdomen brown with white hairs. 



(559. albicans, W.) 



63 (62). Abdomen flesh-coloured, brown above when dried. 



(562. pumillus, Winn.) 



64 (24). Wings quite bare. 



65 (68). V.4. dividing some distance beyond X.4. 



66 (67). Wings with dark markings. (569. illustris, Winn.) 



67 (66). Wings quite clear. (568. candidates, Winn.) 



68 (65). V.4. dividing at or before X.4. 



69 (72). Femora without thorns on the underside. 



70 (71). Small species not more than 1 mm. long. 



(566. lacteipennis, Ztt.) 



71 (70). Large species at least 2 mm. long. 



567. Ceratopogon nitidus, Mcq. 

 Shull, 1 ?, June, 1904; Bedburn, 1 $, June, 1905. 



72 (69). Femora with thorns on the underside. 



73 (83). Claws without teeth. 



74 (75). Hind femora much thickened, and with strong thorns 



beneath. (583. femorates, Mg.) 



75 (74). Hind femora not thickened, and at most with 



ordinary thorns. 



