. An account of British flies (Diptera). Diptera -- Great Britain. NEMATOCERA. 49 has undergone for fertilization by insects, and has called forth a great deal of attention. The figure below shows the modifications. The distribution of the Cecidomyidce in space seems to be very great; most regions of the globe furnishing examples of this family. They seem to extend into the Arctic Circle, but are more abundant as we approach warmer climes. Their distribution in time is limited, as far as we know, the tertiary ambers alone yielding tlieir remains. From these, two extinct genera, Lithomyza and J
. An account of British flies (Diptera). Diptera -- Great Britain. NEMATOCERA. 49 has undergone for fertilization by insects, and has called forth a great deal of attention. The figure below shows the modifications. The distribution of the Cecidomyidce in space seems to be very great; most regions of the globe furnishing examples of this family. They seem to extend into the Arctic Circle, but are more abundant as we approach warmer climes. Their distribution in time is limited, as far as we know, the tertiary ambers alone yielding tlieir remains. From these, two extinct genera, Lithomyza and JMonodiciana, Lw., have been described. The former belongs to the Anaretina, and the latter to the Cecidomyina. About twenty-three species in all have been described, amongst the sub-genera Epidosis,"^ Dirhiza, Diplosis, Cecidoinyia, and Asyiiapfa, some from America and some from Europe. Lasioptera has also been found in a fossil state in ^^'yoming. Their small size 'and fragile nature would naturally hinder their Fic. II.—Aristolochia clematis, showing method of fertilization, i. Unfertilized blossom. 2. Fertilized. A. Funnel. B. The flask with generative organs. C. The ovary. The classification of the Cecidomyida^ is as follows. They can be divided, according to Loew, into two sub-families : A. Cecidomyina = CecidomyincE^ Rd. Three or four longitudinal veins on wings, the last two often coalescing at the beginning of their course, forming a fork. Ocelli absent. B. Aiiareti/ia ~ Lestre/iiiiuv, Rd. Has a supplementary vein between the second and third of the Cecido/ziyina. This additional vein is furcate. Ocelli are present in most of this * "Bernstein-Fauna," p. 32 Loew, descriptions of C. [Epidosis] incoinpL'ta and C. ininiiiissinia. t Cccidogoua has no Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may
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