1902.] 215 



aquatic Acridians, of the family Tettigidce, e. g., Scelimena harpago, 

 Serv., and allied species. This species in particular has the hind 

 tibia and tarsus laterally expanded for swimming. The insect fre- 

 quents the mountain streams of Ceylon, resting on the wet rocks in 

 mid-stream. When disturbed they leap without hesitation into the 

 water, and either swim to another rock, or dive to the bottom, often re- 

 maining there for a considerable period. I remember on one occasion 

 observing the larva of some Tettix walking about amongst the dead 

 leaves at the bottom of a shallow pool. Gavalidium crocodilus, Serv., 

 is another species that frequents wet rocks ; but I have uever seen 

 this insect actually take to the water. 



Peradeniya, Ceylon : 



July 28th, 1902. 



ON A CICADINE NEW TO BRITAIN. 



BY JAMES EDWARDS, F. E. S. 



LlMOTETTIX STACTOGALA. 



Stactogala, Amyot, Ann. Soc. Eut. Fr., xv, p. 21.7 ; id., Meth. Mon., 



p. 413 (1847). 

 Opsins stactogalus, Fieber, Neue Gatt. und Art. iu Horn., p. 9, t. vii, 



f. 19 (1866). 

 Thamnotettix tamaricis, Kirschbaum, Cicad., p. 90 (1868). 

 Athysanus stactogala, Ferrari, Cicad. agri Ligust., pp. 54 — 57 (1882) ; 



Melichar, Cicad. Mitt. Eur., pp. 258—261 (1896). 

 Upper fore-parts shining yellowish-green, elytra dull leek-green with rnilk- 

 whito spots. Crown evenly rounded in front, not longer in the middle than at the 

 sides, in the male three times, in the female three and half times, as broad as long. 

 Frontal suture from the antenna to the elypeus but little more than half as long 

 as the distance between the antennae. Clavus and corium dull leek-green, with 

 more or less of the costal area, and a varying number of small irregular spots, 

 milk-white, veins dark green ; membrane milk-white, the second apical area and 

 parts adjacent, with the veins, reddish-fuscous. Face, legs, and under-side pale 

 green ; spines of the hind tibiae white. Abdomen above black, with the sides 

 narrowly pale. Length (including elytra), 5 mm. 



I am indebted to Mr. E. A. Butler for the opportunity of re- 

 cording this interesting addition to the British fauna ; the specimens 

 were taken by Mr. H. L. F. Guennonprez in August, 1901, at Pagham 

 Harbour in S.W. Sussex, where old-established plants of Tamarix, 

 the food-plant of the species, grow abundantly : it is a species of 

 South European distribution, and doubtless introduced into this 

 country with its food-plant. This insect has at various times been 



S 2 



