Notes from the Gatty Marine Laboratory. 125 
FHalictus erythrurus, Cockerell, 
? .—York, W. Australia (O. //. 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. 
HHalictus melanurus, sp. 0. 
? .—Length about 4 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 keneath except at base; tegulee 
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 
aud nervures ferruginous; outer r.n. aud t.-c. much weak- 
ened ; first r.n. meeting second t.-c. Head ordinary, face 
broad ; clypeus shining ; front dull; mesothorax moderately 
shining, very finely punctured; area of metathorax rough, 
with delicate plice, 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 wrinkled plicee ; hind spur of the simple type 
(microscopically serrulate or spinulose). 
York, W. Australia (O. H. Sargent). U.S. Nat. Museum. 
Related to the Tasmanian fH. disclusus, Ckll., but easily 
separated by the red tegule. It is also a smaller species, 
The scopa on hind tibiz is rather short and thin, but beauti 
fully plumose. 
XII.—Notes from the Gatty Marine Laboratory, St. An- 
drews.— No. XLII. By Prof. M‘Inrosu, M.D., LL.D., 
Desc. L.R.S., Xe. 
1. Preliminary Studies on Filograna: a, Historical; 6, Faunistic ; 
ec, Structural; d, General. 
2, On Harmothoé watson, M‘I., an var. H. marphyse, M‘I. 
1. Preliminary Studies on Filograna. 
(a) Hisroricat. 
Filograna, the subject of the following remarks, has pro- 
bably been known to marine zoologists from very early 
