80 (81). Costa with spines in addition to the ciliation (_plate_ VII, 14). HELOMYZIDÆ, XXXVI 81 (80). Costa without a row of spines, only ciliated. 82 (83). A, III (5) present, or, if absent, then body never shining black. CORDYLURIDÆ, XXXIV 83 (82). Fronto-orbital bristles absent; body always shining black. _Part of_ SEPSIDÆ, XLVI 84 (77). Vibrissæ absent; mouth with short hairs or bare (_plate_ VII, 1, 3, 4); or, if the hairs are strong, all of same length and strength. 85 (88). A, IV very long and horizontal; A, IV (4) as long or longer than A, IV (5) of which the upper edge is concave (_plates_ III, 54; VII, 1). 86 (87). Profile not triangular; face perpendicular or slightly retreating. _Part of_ SCIOMYZIDÆ, XXXVIII 87 (86). Profile triangular; A, V retreating (_plate_ VII, 1) almost horizontally. _Part of_ ORTALIDÆ, XLI 88 (85). Antennæ not long, or, if long, drooping; A, IV (4) shorter than A, IV (5) of which the upper edge is straight or convex. 89 (90). Brown or black shore flies with flat horny thorax and with strong mouth hairs. _Part of_ PHYCODROMIDÆ, XXXV 90 (89). Otherwise than 89. 91 (94). O, 5^1 and O, 6^1 very small and indistinct. 92 (93). Only one fronto-orbital bristle on each side; tibiæ all without the præ-apical bristle. LONCHÆIDÆ, XLIII 93 (92). A, III (5) on each side; the præ-apical E on some of the C, I (4). SAPROMYZIDÆ, XLIV 94 (91). O, 5^1 and O, 6^1 fairly large and quite distinct. 95 (96). Hind tibiæ with a præ-apical bristle. _Part of_ SCIOMYZIDÆ, XXXVIII 96 (95). Hind tibiæ without the præ-apical bristle. 97 (98). A, III (6) present and close to A, II; V, 1_a_ sharply bent up at its end (_plate_ V, 34). Wings usually spotted; ovipositor protruding. TRYPETIDÆ, XLII 98 (97). Lower fronto-orbital bristles absent; V, 1_a_ gently bent up. 99 (104). Legs long; abdomen narrow and long, contracted at base. 100 (103). V, 4 straight or nearly so. Shining black species. 101 (102). V, 6 reaching to the wing margin; abdomen narrow, more than twice as long as the thorax. _Part of_ PSILIDÆ, XXXIX 102 (101). V, 6 not nearly reaching margin; D rather broad. _Part of_ SEPSIDÆ, XLVI 103 (100). V, 4 much bent towards V, 3. Brown species. _Part of_ MICROPEZIDÆ, XL (genus Calobata) 104 (99). Legs normal; D comparatively short and broad, never contracted at base. _Part of_ ORTALIDÆ, XLI 105 (76). V, 1_a_ absent or rudimentary, much thinner than V, 1_b_, which latter ends at or before the middle of the fore margin. 106 (107). Hind C, I (5) thickened and shorter than the next joint. BORBORIDÆ, LVI