The dorsal edges of all three joints bear a fringe of hair on each leg. A number of rows of spines occur on the dorsal and ventral edges of the femora and along a median tract on both the anteior and posterior surfaces. Spines also occur sparsely on the tibiae, but mainly along the ventral edge and a few on the tarsi—ventrally in the case of the two hinder pairs, anteriorly and posteriorly on the anterior pair. Claws—Sharply curved and pointed at tip, which is darker than the rest of the claw. Ventrally there are a number of small teeth. Note: In the legs of the specimen figured, the claws were turned round: in life, they should face in the opposite direction. Gills (Text-Fig. 28)—Pairs of gills are borne laterally on the first seven abdominal segments. Those of the first pair are reniform with pointed apices: the gills of the other pairs are ovate-acuminate; they become smaller posteriorly. Each gill consists of a flat, almost colourless, lamella: the black tracheal venation is pinnate. Considerable ramification of tracheoles is visible between the tracheal branches. The lamella surface is covered with pits. At intervals, all round the edges of the gills, are a number of very minute sensillae (not shown in figure). The gills are vibrated at a moderate speed for short periods, alternated by periods of rest. The apical points are longer and more acute than those of the gills of D. lillii and the lobe of the kidney-shaped anterior gills has a less pronounced salient. Distribution—Tributary of the Kaiwarra Stream at Ngaio and Khandallah, near Wellington. Deleatidium lillii (Walker). The winged stages of this species were first described by Walker (24) under the name of Baetis scita, then by Eaton (17) as Leptophlebia scita and again (4) as Atalophlebia scita and finally (5), when further specimens were sent, together with some of the nymphal stage, as Deleatidium lillii. Lillie (3) also described all stages as Atalophlebia scita, subsequently (18) quoting Eaton's (5) description of the winged stages and his renaming of the species. As the male genitalia are well figured by Eaton (5) and also by Lillie (3) and the latter has also illustrated the venation, head and legs of the adult as well as the legs, mouthparts and general appearance of the nymph, only photographs of the imaginal and sub-imaginal wings are included here. (Pl. 67, Fig. 17 and Pl. 63, Fig. 7). Nymph—Apparently practically identical with that of D. vernale, described above. The gills are illustrated (Pl. 64, Fig. 11), for comparison with those of D. vernale. The photograph of the nymphal exuvia (Pl. 63, Fig. 10) is of D. lillii, but it would represent equally well the nymphal exuvia of either D. vernale or D. autumnale. Imago—Length, 8.5 mm. (excluding setae). Head—Umber brown.