METJRIOPTERA ROESELII. 171 



other places to all appearance exactly similar, he could find 

 no trace of it elsewhere. It occurred amongst the long* rank 

 grasses, from the base to ten or a dozen yards up the steep 

 side of the sandhills. The bright green border of the side- 

 flap of the pronotum was most conspicuous as soon as the 

 insect was seen at all. In many specimens there was a good 

 deal of green about the femora, etc., although in others these 

 parts were brown. Indeed the living insect is far more 

 distinct from J/. brtichyptera than the descriptions seem to 

 indicate. Writing 10 September 1912 Porritt said: "I send 

 you a living specimen of P. roeselii which I took at Trusthorpe 

 on 9 Sept. During the past fortnight I took three dozen 

 there, notwithstanding- atrocious entomological weather. All 

 my specimens, without exception, had the semicircular border 

 round the side flap of the bright grass-green colour of this 

 specimen, whereas all descriptions of it I have seen give the 

 colour as yellowish or yellowish-white. No doubt that idea 

 has been got from dried or set specimens, as I find the colour 

 soon goes after the death of the insect, and in some of the 

 earliest-caught specimens on the setting-boards the green has 

 already quite faded away. The colour in other respects, as 

 you will see, is also slightly different from that of the published 

 descriptions. I managed to find only two specimens yesterday 

 morning in the strong wintry gale blowing, one of which I 

 now send to you." 



It will be seen that all the British examples have been 

 taken about the mouth of the Thames, or on the east coast 

 south of the Humber, if we omit a doubtful nymph in 

 Gruermonprez' collection from Par in Cornwall. 



Genus 3. TETTIGONIA Linn. 



Gryllus Tettigonia LINN. Syst. Nat, (10) vol. i. p. 429 . . 1758. 



Decticus SERVILLE Ann. Sc. Nat. vol. 22. p. 155 . . . 1831. 



t 



Linnasus divides his genus Gryllus into six sub- 

 genera, one of which, Tettu/onia, with seventeen species, 

 he characterises as : " Cauda ensifera feminis." 



More clearly diagnosed the genus is*as follows :- 

 Vertex broad. Pronotum unarmed, with or without 

 carinse. Organs of flight fully developed, the elytra 

 usually twice as long as the pronotum, or more. Legs 

 long, the hind femora very long and much swollen at 

 the base. Fore tibiae armed above on the outer side 



