A GUIDE TO THE STUDY OF BRITISH WATERBUGS. 151 



mesosternum elevated ; femora all inerassate ; tarsi 2-8eg- 

 mentate, not pilose, second segment longer than the first, termi- 

 nated by two long stout curved claws (fig. 34). The connexivum, 

 which is not very clearly marked off, is spinosely produced 

 posteriorly. 



Until recently only a single species of the genus — known as 

 A. cBstivalis (Fabr.) — was included in the British lists. Dr. 

 Horvath, in his recent monograph of the genus,* has added 

 another, which he names A. montandoni. These two species 

 seem to be sufficiently distinct, but I think the learned Doctor 

 has fallen into error in maintaining A. cestivalis as British. It 

 is true that the figures given by Westwood and by Douglas and 

 Scott refer to the latter species, but they were both drawn from 

 one of the original specimens of Fabriciust captured in France ; 

 and I am not aware of macropterous examples having been obtained 

 in the British Isles. All the apterous individuals I have seen — 

 including those in my own collection — belong to A. montandoni, 

 and we must therefore apparently erase cestivalis from our lists. 



The synonymy of the two species should be amended to : — 



1. Aphelocheirus cestivalis (Fabr.). 



Westwood (pp.), 1833, Ann. Nat. Hist. vi. p. 228 ; 1839, 

 Modern Class. Ins. i. frontispiece, fig. 7, and 1840, ii. p. 466, 

 fig. 120 ; Douglas and Scott, 1865, Brit. Hem. pi. 19, f. 5. 



Habitat. France, Germany, and Hungary (not England). 



2. A. montandoni, Horv. 



^=A. cestivalis, Dougl. and Scott, I.e. p. 578. Saunders, 

 1876, Trans. Ent. Soc. Lond. p. 643, and 1892, Hem.-Heter. 

 Brit. Isl. p. 326, pi. 30, fig. 9 {nee Fabr.). 



Habitat. England, France, Germany, Switzerland, Eussia, 

 and Kumania. 



A. montandoni is rather smaller, wider, and flatter than 

 aestivalis, narrower anteriorly in proportion, and the head paler 

 and longer. The terminal segments in both sexes are somewhat 

 different in shape. Only the apterous form is known so far. It 

 has been recorded in England from Bagley Wood, Oxford (years 

 ago —Mr. Burr has not been able to find it recently) ; the Even- 

 lode, near Eynsham, Oxford ; Sutton Park, Warwickshire ; Avon, 

 near Bath ; Costessey, near Norwich ; and Worcester. 



* 1899, Termesz. flizet., xxii. pp. 256-67. 



f " My British specimens have but short rudimentary oval hemelytra, 

 like those of the bed-bug ; but I possess one of Bosc's original specimens, 

 described by Fabricius, not quite so large as the others, in which the wings 

 are fully developed." — Westwood, 1840, Mod. Classif. Ins. ii. p. 466. Douglas 

 and Scott borrowed Westwood's French specimen to figure the macropterous 

 form (which they did not possess) in the ' British Hemiptera.' 



