236 THE entomologist's record. 



primaries assumed a pretty pinkish hue in marked contrast to the 

 tawny colour of the secondaries ; I took several quite fresh specimens. 

 All the Saas-Fee Erebias were taken, and in addition, amidst the 

 moraines near the lake, K. (/ori/e still delighted to spread their wings to 

 the sun on the hot stones ; one or two were fresh, but the majority 

 quite too worn to capture. The only Hetcrocera I took were an Kndrosa 

 {Setino) aiirita and one or two Kpsilia [Agrotia) cuprca. I took a com- 

 fortable walk from the Fee Alp to Stalden the following day, and from 

 thence went on to Eclepens, an account of which place has already 

 appeared in your journal, and thus ended my holiday for 1910. But 

 the glaciated valley of Mattmark so filled me with interest that I felt 

 I must try some time to spend a few days beside all that remains of 

 the former lake, now so shrunk, narrow and shallow, that I was told 

 I could walk through it almost anywhere. 



Lasius mixtus, Nyl., in Britain. 



By H. St. J. K. DONISTHORPE, F.Z.S., F.E.S. 



There are only two records heretofore of La^iiiA )inxtiis, Nyl. (a race 

 of L. loiibratiis, Nyl.), occurring in Britain. The first"^' record was by 

 the late C. J. Bignell, who brought it forward as new to Britain on 

 J s, ? s and ^ s which he discovered at Bickleigh, near Plymouth. 

 Subsequently Grimshawl recorded it from the Isle of May, where he 

 also took J s, 2 s and ^ s. 



On examining my series of L. umbratiiK I found that I possessed 

 a deillated ? which I had taken at Weybridge on March 7th, 1910. 

 Recently Mr. Evans, of Edinburgh, sent me specimens to determine of 

 ants which he had taken in the Isle of May. There were undoubtedly 

 $ s and ^ s of L. mi.rtuK among them. On February 17th last my 

 friend, Mr. Hereward Dollman, found a deiilated 5 of this race in 

 Richmond Park, and on April 22nd my friend, Mr. Crawley, and 

 I captured two deiilated $ s on the road near Mickleham. It is there- 

 fore probable that this race is widely distributed in Britain. 



To enable British Hymenopterists to recognise this ant, I have 

 translated the tables given by Professor Forel in his Fourmis. dc la 

 Suisse. 



Workers. 



A. Size variable, generally small ; 1. 2mm. -4mm. In 



large specimens the abdomen and the head red- 

 dish. Scale low, a little broader at the base than 

 at the apex, not or scarcely eraarginate. Thorax 

 and abdomen very hairy on the upper side. 

 Tibiae pubescent, without exserted hairs . . . . L. flavits, Fab. 



B. Size less variable, generally large ; 1. 3*5mm.-5mm. 



The whole body the same colour, clear yellow, 



sometimes a little reddish. Scale higher than in 



the preceding species, narrower at the apex than 



at the base .. .. .. .. .. .. L. uinbratus. 



(a). Tibia; with exserted hairs. Thorax and abdo- 

 men very hairy. Scale high, entire or very 

 feebly emarginate at the top. 1. 3"5mm.- 

 4"5mm. .. .. .. .. .. .. L. u)id)r(iiu$, 1, spec. 'Sjl. 



* " Lasius mixtus, Nyl., an Ant new to Britain," Eiitom., xiv., 1881, p. 262. 

 t Aim. Scot. Nat. Hist., 190S, p. 89. 



