124 THE SCOTTISH NATURALIST 
in the shorter and differently marked abdomen, in the considerably 
longer and narrower fork of vein Cu, its base being well before 
the base of the 7m cross-vein, and in the male claspers, which 
are as in Fig. 9. 
Allodia nigricollis, Zett.—For convenience, this name may be 
used for a species which resembles 4. a/ternans, except in having 
male claspers as in Fig. 10. The females seem indistinguishable. 
A male sent to Lundstrém in 1912 was thus determined. 
Dasyhelea polita, sp. n.—Wing-length 1.5 mm. Black; tarsi and 
halteres rather lighter; mesonotum shining, with a slight greenish 
tinge and ill-defined greyish reflections; joints 7 to 13 of ¢ 
antenne striate at the base, 12 and 13 with two distinct verticils, 
the striation extending to the second verticil, 11 with the second 
verticil indistinct; joints 2 to 5 of @ antennz globular, 6 to 9 
gradually longer, 9 not much shorter than ro, to to 14 oval, slightly 
enlarged near the base, about three times as long as broad, without 
distinct sense bristles; hind tibiz and tarsi with very long hair, 
especially in male; wings much as in DJ. estiva, Winn; hypo- 
pygium, Fig. 10. Type, male, and other specimens in British 
Museum, from Corriegills, Arran. This is similar to, if not identical 
with, the species which Kieffer has identified (obviously erroneously) 
as D. obscura, Winn. (Ann. Mus. Nat. Hung., xvii. 1919, p. 61.). 
Culicoides heliophilus, sp. n.—Allied to C. albicans, Winn., 
C. cunctans, Winn., and C. perpungens, Kieff. Body wholly 
dull black; wings milk-white, with rather sparse but uniformly 
distributed pale hair; hair over radial cells black; halteres pale 
yellowish; fourth tarsal joint short but cylindrical; hypopygium, 
Fig. 11. Type, male, in British Museum, from Machrie, Arran ; 
also found on Dartmoor (#: WZ.) and Goathorn, Dorset ( Yerdury). 
Psilohelea edentata, sp. n. 9 .—Resembles LP. candidata, Winn., 
but smaller (wing-length 1.3 mm.); mesonotum shining black, the 
sensory pits smaller (though quite distinct) ; eyes quite bare; claws 
simple; stem of median fork a little longer. Type, female, in the 
British Museum, from Sannox. 
This species would be excluded from Psz/ohelea by Kieffer’s 
diagnosis, but I consider it should nevertheless be placed there ; 
an exaggerated importance seems to have been given to the presence 
of fine pubescence on the eyes, and of small teeth on the female 
claws. I would include Zsohelea lactetpennis and Dasyhelea grandt- 
forceps in Psilohelea, defining two sub-genera thus :—VPsz/ohelea : 
sensory pits of mesonotum conspicuous, base of lower branch of 
media distinct ; Zsohe/ea: sensory pits minute, base of lower branch 
of media obsolete. 
