BRITISH WATERBUGS. 63 



12a. Pronotum much longer than vertex, with seven to 



ten pale lines ....... 14. 



13. Pronotum with five pale lines . . . . scotti. 



1 3 rt. Pronotum with six palo lines .... fossarum. 



14. Transverse markings of corium divided hy two 



black longitudinal lines ..... limitata. 

 14 rt. Transverse markings divided by three black longi- 

 tudinal lines ....... 15. 



14 Z*. Transverse markings undulated and interrupted, 



not continuously divided by black longitudinal 



lines ........ saiindersi. 



14 c. Transverse markings entire ..... nigrolineata. 



15. Male facial impression deeply excavated and ex- 



tended high up between the eyes ; female palse 



short, wider near the base .... semistriata. 



15 a. Male facial impression less deep, more parallel- 



sided ; female paloB longer and narrower . . venusta. 



1. A. LUGUBRis (Fieber). Generally distributed, but mixed 

 in collections with the next. 



2. A. SELECTA (Fieber) (= luguhris, Saunders, in part). 

 Described by J. Edwards in 1893 'in the Ent. Mo. Mag. False 

 figured by me. 



I have taken it in brackish water at Gravesend, Kent. 

 Edwards notes it from the coast marshes of Norfolk. 



3. A. LATERALIS (Lcach) {= hieroglyphica, Saunders). Gener- 

 ally distributed. The ova are figured by Dufour; they are 

 elongate, oval, and pointed anteriorly. 



4. A. FOSSARUM (Leach). Generally distributed. 



5. A. SCOTTI (D. & S.). All over Scotland. 



[A. prominida (Thomson), a doubtful Scandinavian form has 

 been reported from Scotland, but the specimens I have seen are 

 merely scotti.] 



6. A. SAUNDERSi (Kirkaldy). Described by me in the Ent. 

 Mo. Mag. for 1899 ; and palae figured in ' Quekett Journal.' 



Taken only in one pond in Surrey. 



7. A. LIMITATA (Fieber). England from Lincolnshire south- 

 wards, and Wales. 



8. A. SEMISTRIATA (Fieber). Distributed probably over the 

 United Kingdom, but not common. 



9. A. vENUSTA (D. & S.). Same as last. 



10. A. NIGROLINEATA (Fieber) {=fahncii in Saunders). A 

 variable species in colour and markings. Common and well 

 distributed. 



11. A. MCESTA (Fieber). Generally distributed. 



12. A. UNDULATA (Costa) (= striata, Fieber). This accords 



