226 Mr. F. W. Edwards on British Limnobiidae. 
D. guerini Zett. As recently shown by Lundstrém, 
this species is quite distinct from the common D. bimaculata, 
differing in the hypopygium as well as in other characters. 
Its inclusion now in the British list is due to Mr. C. A. 
Cheetham, who has taken several at Austwick, near 
Ingleboro. 
TRICYPHONA (Amalopis). 
1. Rs more or less clouded at the base, and often angulated or 
spurred. ; - : f ; ; : yoy as 
Wings quite clear; Rs never angulated or spurred. om 
2. Thorax dark grey, with four blackish stripes; a distinct brown 
band over the cross-veins . ; ; : occulta Mg. 
Thorax uniformly yellow or orange i vA pte 
3. Larger, browner species; femora and tibiae sitlicial distinct 
black tips ; ; .  littoralis Mg. 
Smaller, yellow species ; nelaeen nee tibiae with black tips 
straminea Mg. 
4. Medium-sized species; pleurae and coxae ochreous . 
Small species; pleurae and coxae black . 5 d Mies) 
5. Pubescence on veins in apical part of wing fairly distinct; R, + . 
fully twice as long as R,* . 7 : lucidipennis sp.n. 
Pubescence on wing-veins barely perceptible; R, ,., less than 
twice aslongasR,  . ; 5 : claripennis Verr. 
6 * R, +, much shorter than 7—-m; thorax with four distinct narrow 
shining black stripes . : ; ‘ schummeli sp. n. 
R, + ; longer than rm; thorax otherwise ; : au kets 
7. Femora not conspicuously yellow at the base; discal cell 
often present; middle thoracic stripe divided by a pale 
line . : unicolor Schum. 
Femora Rae ase) ellow at the base; discal cell never 
present; middle thoracic stripe entire, or obscurely divided 
by a dark line . : ; : : immaculata Mg. 
T. lueidipennis, sp. n. (Pl. II. fig. 24). 
Closely allied to 7’. claripennis Verr., and almost identical with 
it in size and coloration, but differing as follows: Wings somewhat 
broader (10 x 2-8 mm. instead of 9 x 2-1 mm.), the veins towards 
the apex with much more evident hair; R, +, a little more than 
twice as long as R,; cell M, as long as its petiole, instead of only 
half as long; cell M, longer, its sides more parallel. Hypopygiuwm 
* Adopting Alexander’s view that there are five branches to 
the radius present, the short vein connecting R, and R, being 
R, not 7. 
Ore iy 
