Le ee ye a eee eee 
; FS AR Bagh) a Nw S 
; a 
- 
928 Mr. F. W. Edwards on British LIimnoliidae. 
Wing-veins not conspicuously hairy; Ax ending a little before 
the anal angle of the wing; eyes pubescent; last joint of 
palpi only moderately elongate; ovipositor rather long and 
horny (genus T'richocera)  . : : eae, 
2. Abdomen conspicuously banded ath Sony annulata Mg. 
Abdomen uniformly dark (except sometimes the genital seg- 
ments) : 3 
3. Cross-vein 7-m with a distinct dark Fit poe it. wer: 
Cross-vein r-m not clouded. ; : : oe 
4, A distinct cloud on and below base of Re maculipennis Mg. 
No dark cloud on or near base of Rs : regelationis L. 
5. R, 4. noticeably shorter than basal section of R,; knob of 
halteres scarcely darkened . ; ‘ major sp. 1. 
R, +; a8 long as or longer than basal Pron of R,; knob of 
halteres blackish 7 ; : 5 anes 
6. Thorax almost entirely reddish; scape aa aaeasee yellow — 
rufescens sp. Nn. 
Thorax more or less darkened; scape of antennae dark . 7. 
7. Wings slightly and uniformly infuscated; clasper of male 
hypopygium without basal tubercle. ‘ fuscata Mg. 
Wings almost perfectly clear; clasper of male hypopygium with 
small basal tubercle 
8. Smallish species; wings fadiatinoily pate at bake basal pro- 
jections of side-pieces of male hypopygium forming a complete 
bridge : ; , . hiemalis Deg. 
Very small species; wings abit ish ‘ the base; basal projections 
of side-pieces of male hypopygium not meeting in the middle 
parva Meq. 
As is evident from the above table, some of these 
species are distinguished by apparently trifling characters, 
but as I have never found a mixed swarm (adjacent 
swarms may be of distinct species), and the numerous 
pairs taken in cop. have always been similar, I think 
it probable that we are really dealing with distinct 
species. 
D. hirtipenne (Siebke). I took a female of this species 
at Letchworth, vi. 1918. It flew in at an open window and 
settled on my arm while I was engaged in pinning some 
captures. The genus Diazosma appears to me to be amply 
distinct from T'richocera. 
T. maculipennis Mg., has not, so far as I am aware, 
occurred in Britain outside the lowlands of Scotland. 
