Notes from the Galty Marine Laboratory , 125 Halictus erythrurus, Cockerell. ? . — York, W. Australia (0. //. Sargent). The specimen has two large black marks on the fifth abdominal segment, sublateral and lateral spots on the fourth, and lateral spots on the third. I have a specimen from the type-locality with lateral spots on the abdomen, so the pecu-liarity can hardly indicate a subspecies. Halictus melanurus } sp. n. ? . — Length about <i mm. Black, with the abdomen about as far as middle of third segment shining yellowish-ferruginous, beyond that very dark fuscous, almost black, basal half of first segment also dusky; labrum and mandibles except apex dark red; fla-gellum clear ferruginous beneath except at base ; tegulse clear ferruginous. Legs dusky red, with the anterior tibise in front and all the knees clear red ; pubescence scanty, dull white. Abdomen without hair-bands. Wings clear, stigma and nervures ferruginous; outer r. n. and t.-c. much weak-ened ; first r. n. meeting second t.-c. Head ordinary, face broad ; clj-peus shining ; front dull ; mesothorax moderately shining, very finely punctured; area of metathorax rough, with delicate plicae, the margin shining. Microscopical characters : — Front densely punctured, the surface between the punctures finely sculptured ; mesothorax microscopically tessellate, anteriorly transversely lineolate ; area of meta-thorax with wiinkled plicaa ; hind spur of the simple type (microscopically serrulate or spinulose). York, W. Australia (0. H. Sargent). U.S. Nat. Museum. Related to the Tasmanian H. disclusus, Ckll., but easily separated by the red tegula 1 . It is also a smaller species. The scopa on hind tibiae is rather short and thin, but beauti fully plumose. XII. — Notes from the Gatty Marine Laboratory, St. An-drews.— No. XL1I. By Prof. M'Intosh, M.D., LL.D., D.Sc, F.R.S., &c. 1. Preliminary Studies on Filograna: a, Historical; b, Faunistic ; c, Structural; d, General. 2. On Harmotho'e watsoni, M'l., an var. H. marphysce, M'l. 1. Preliminary Studies on Filograna. (a) Historical. Filograna, the subject of the following remarks, has pro-bably been known to marine zoologists from very early
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