1804. 105 



common about here, but notwithstanding diligent search, I have hitherto failed to 

 find the insect, except in one spot having an area of about five square yards, and 

 unless it migrates to some of the numerous plants of the same species close bj, it is 

 doomed to speedy extinction there ; for the Pteris has so rapidly crowded out the 

 favoured patch of Epilobiwm, that if the process goes on at the same rate in the 

 coming year as it has done in the past, the original food-plants will have entirely 

 disappeared. In June, 1893, I found that the Epilobium plants frequented by C. 

 Dahlbomi were, owing to the encroachment of the Pteris, reduced in quantity to 

 less than one-half, and what remained were only about half as robust as in the 

 previous year ; but although I took considerable pains in the matter, I could not 

 discover that the insect had spread to any of the numerous adjacent plants ; the 

 latter, however, were, so far as I could see, equally well suited for the support of the 

 species. It is a comparatively large species, approaching C. punctifrons in point of 

 size, and may readily be distinguished from its British congeners by the pale green 

 elytra with stout black veins in the male, and the plain pale sea-green elytra in the 

 female. Dr. Puton gives its range as Scandinavia and France. 



Deltocephalus paleaceus, J. Sahl, 



The insect which I identify with this species is most nearly allied to D. Flori, 



which it resembles in size and the milk-white veins of the elytra, but from which it 



may be distinguished by the reddish rust-yellow ground-colour of its upper-side, the 



almost entire absence of fuscous markings on the elytra (the most prominent fuscous 



markings on the elytra, except the dark hind margin to the apical areas, being a 



fuscous border to the hind margin of the third subapical area), and the shape of the 



hind margin of the last ventral segment in the female, which has the apical angles 



rounded off, and no small tooth between the sides of the projection and the sides of 



the segment as in Flori. The genital style of the male resembles that of Flori. I 



took a small series of this species at Brooke Wood, Norfolk, in August, 1888 ; it 



occurred sparingly in company with a profusion of D. Flori, and in the net its 



general rust-yellow colour contrasted strongly with the greyish-testaceous appearance 



of Flori. The late Mr. Scott put D. paleaceus as a synonym of Falleni, Fieb., and 



Dr. Puton in his Catalogue does the same ; but if I am correct in referring the 



insect now under consideration to paleaceus (and it agrees well with Sahlberg's 



description), then paleaceus does not = Falleni. I am scarcely so well acquainted 



with the latter species as I could wish, but I have a male specimen the genital style 



of which agrees fairly well with Fieber's figure (Syn. Eur. Delt., pi. v), and which 



in point of facies agrees well with specimens named Falleni by Dr. J. Sahlberg for 



Mr. Douglas ; and so far as one can judge from this material the most obvious point 



of distinction on the upper-side between Falleni and distinguendus lies in the more 



distinctly arcuate free sides of the crown in the former ; this difference, however, 



is so small that it is difficult to appreciate, and a much more satisfactory distinction 



is found in the shape of the genital styles, since the simple clavate black style of 



distinguendus cannot well be confounded with the pale style of Falleni, with its 



crenulation on the outer side from the apes downward. Having regard to Fieber's 



figures of the male genitalia of distinguendus, I have no reason to doubt that my 



determination of that species is correct ; and if this is so, then his figure of the 



