1g01-1902.] The Entomostraca of Mid-Lothian. 317 
be found Cyclops bisetosus, a species which is far from common 
in Mid-Lothian. 
From Cobbinshaw Reservoir we obtained quantities of 
Scapholeberis mucronata and Bosmina longirostris; and, in 
addition, our only specimen of Alonella rostrata. 
Species. 
Diaptomus gracilis is the only species of the family Centro- 
pagide that we have met with in Mid-Lothian; it is a slender, 
beautiful creature, with extremely long antennas exceeding the 
entire length of the body. It is in the habit of resting upright 
and motionless in the water, with its antennas outspread; but 
the instant it is approached with the dipper, it darts off with 
unexpected rapidity. It seems to be the most agile of all our 
sixty species. It varies greatly both in size and colour: 
many of our largest specimens were a dark yellow brown; the 
smaller ones are often bluish and very transparent, with a 
distinct tinge of red in the antennas; while the male is some- 
times bright red throughout. 
We succeeded in finding in Mid-Lothian fourteen out of 
the eighteen Scottish species of Cyclops. Two of them, Cyclops 
languidus and C. nanus, have not as yet been reported from 
many localities in Scotland; and the latter was recorded from 
Scotland for the first time as recently as 1899, by Mr Scott. 
But from what we have seen in Mid-Lothian and elsewhere, 
we are under the impression that it may often be found in 
pools in mossy ground. 
Cyclops serrulatus is the commonest species of the genus; 
and as might be expected, is very variable, especially in size 
and colour. It is easily recognized by the divergent, pointed 
egg-clusters, and by the long and slender stylets with their 
serrate margins. 
Cyclops phaleratus is a showy species, often coloured bright 
red and blue. It may be recognized at a glance by the dark 
egg-clusters, which are parallel and lie unusually close to each 
other; and by its already mentioned habit of crawling along 
at the edge of the water, or even out of it. 
With regard to Canthocamptus staphylinus it is interesting to 
notice that the fifth foot, which in the Copepods may generally 
