The Pupa.(Figs. 5, 6.)
Larva pupates amongst vegetation near ground. Pupa differs but little in main features from those already described. Colour pale amber-brown; segments moderately rounded, smooth and shining; on lateral intersegmental regions are a number of microscopic spines; dorsally segments are slightly produced caudad in mid-line.
Average dimensions: Length, 1·93 mm.; greatest ventro-dorsal diameter, 0·86 mm.; greatest transverse diameter, 1 mm.
Duration of pupal existence usually averages twenty to thirty days. Dehiscence occurs as in previous species.
Fig. 1.—Portion of a veronica-leaf heavily mined by A. flavocentralis. Note “herring-boning” within the gallery, the line of grass, and old egg-pockets scattered over the leaf. × about 4. (Camera-lucida sketch.)
Fig. 2.—Mine of A. clianthi in a leaf of Clianthus puniceus. Note characteristic double line of frass. × about 4. (Camera-lucida sketch.)
Fig. 3.—Mine of A. umbrina in veronica-leaf; seen by transmitted light. Note the heavy “herring-boning.” The pale area at the start of the mine is caused by the preliminary mining on the opposite side of the leaf. × about 4. (Camera-lucida sketch.)
Fig. 4.—A blotch mine of A. umbrina cut across transversely, showing in the interior the pupa attached by its caudal thread to the floor of the mine. Greatly enlarged. (Photo.)
Fig. 1— Mines of P. albiceps in leaf of sow-thistle Photo by direct contact. Natural size. The small white scattered spots are “egg-pockets”
Fig. 2.—Mine of A. flavopleura var. casta in leaf of Asplenium lucidum. Natural size Photo by direct contact
Fig. 3.—Mines of A. flavopleura in Asplenium flaccidum. Photo by direct contact Natural size
Fig. 4.—Mines of A citreifemoiata in ngaio-leaves About natural size
Figs. 1, 2.—Mine of A. flavocentralis in veronica-leaf.
Fig 3.—Sketch showing track taken by larva, fig. 2.
Fig. 4.—Mines of A. umbrosa in veronica-leaf.
Fig. 5.—Mine of A. flavocentralis in veronica-leaf.
Fig. 6—Mines of A. umbrina in veronica-leaf.
Fig. 7.—Mine of A. umbrinella in leaf of Veronica Colensoi, showing upper and under surfaces.
(Camera-lucida drawings. All natural size.)
(20.) Agromyza flavopleura n. sp. (The Fern-fly).