208 [July. 



Deltocephalns thenii sp. u. 



D. striatus Then (pars). 



I give this name to the second species mentioned and figured by Prof. Then 

 (t.c. 1899, p. 166, note 2, t. II, fig. 6a). It appears to me that we cannot do 

 better than accept Then's definition of striatus L., though none can say with 

 certainty whether this is or is not the kind of insect which was described by 

 Linnaeus under that name ; but no useful purpose is served by treating under 

 one name what are obviously two species. D. thenii is best distinguished from 

 D. striatus Then by the form of the aedeagus (fig. 6), the free portion of which 

 consists of two chitinous branches, in shape somewliat resembling tbe frame of 

 a lyre and connected by a transparent membrane. The aedeagus of D. striatus 

 Then (fig. 13) resembles a spoon of which the handle is about equal in length 

 to the bowl. 



D. thenii is generally distributed and common in Britain, but I 

 only know D. striatus from coast- marshes at Wells and Wey bourne, 

 Norfolk. 



Deltocejihalus normani Scott. 



D. s'uhstriatus Then. 



This is not, as I formerly supposed, an uncommon form of D. striatus, but 

 a distinct species, which was described by Prof. Then (op. cit. 1901, p. 186) under 

 the name of substriatus. It is likely to be confused with D. thenii, from which 

 it differs in being less strongly marked with black, and in its slender aedeagus 

 with a small, oblique, slightly expanded mouth (fig. 4). The inner apical areas 

 have a tendency to whiteness, and it was to specimens in which this feature is 

 particularly well-marked that Scott gave the name 7iormani in 1881. In fresh 

 specimens the veins are decidedly yellow. 



I have found this species just as common as D. thenii. 



« 

 Limotettix atricapilla Boh. 



Readily distinguished from L. striola, which it otlierwise much resembles, 

 by having the front edge of the elytra broadly pale. Grenital styles acuminate 

 and curved inward at the apex, on the outer side a little below the apex a strong 

 triaiagular tooth (fig. 3). The concave hind-margin of the last ventral segment 

 in the female has a feeble semi-circular notch in the middle. 



Amongst low plants at the edge of pools, Newchurch Common, 

 Delamere Forest district, September, 1910, and August, 1914. 



Limotettix saturata sp. n. 



Resembles L. aurantipes in having the upper-side and legs yellow, inclining 

 to red, and the black spots on the crown small, or even absent, but the frontal 

 black spots are roundish or obtusely trigonate, not wider than long. The genital 

 valve is about twice as wide as high and the genital plates are transversely 

 impressed across their apical third ; the inner edge of each is sub-equal to its 



