157 



DESCRIPTIONS OF FOUR NEW SPECIES OF TYPHLOCYBA. 

 BY JAMES EDWARDS, P.E.S. 



Our yellow or whitish species of Typhlocyia with the abdomen 



entirely pale and the mem- 

 brane at most faintly fusco- 

 hyaline, constitute a some- 

 what difficult group in 

 which the' structure of the 

 male genitalia affords the 

 best, and in some cases the 

 only certain, characters for 

 the discrimination of the 

 species. In these small 

 insects a mere external ex- 

 amination of the plates, 

 py gofer, and anal tube, is of 

 little use ; but on dissection 

 we find that the penis pre- 

 sents great structural differences, which, from their undoubted 

 constancy, are of the utmost value as specific characters. It is re- 

 markable that Fieber overlooked this organ in his drawings of Delplia- 

 cidcd and descriptions of Typldocybidce, as it reaches its maximum of 

 utility as a differential character in those groups. 



Ttphloctba hippocastani, n. sp, 

 $ . Upper-side sinning. Crown, pronoturn and scutellum sordid yellow. Elytra 

 whitish-hyaline, the corium strongly tinged with yellow from the inner margin to 

 the sub-costal area, nerves of the membrane whitish, the stalk of the second apical 

 area of normal length. Abdomen entirely yellow. Face, under-side and legs pale 

 sordid yellow, claws black. Genitalia as figured (a, penis, b, style, c, plate) ; the 

 four appendages of the penis, forming the lower group, are somewhat similar to 

 those of T. Lethierryi (Ent. Mon. Mag., xvii, 224, a), but those of the upper group 

 are totally different. 



Pound by Mr. Douglas commonly on the under-side of the leaves 

 of horse-chestuut (JEsculus hippocastanum) in Beaufort Gardens, 

 Lewisham, in October. I have dissected six males, not one of which 

 shows any tendency to vary in the structure of the appendages of 

 the penis. 



Typhlocyba ayellaile, n. sp. 

 Crown, scutellum and pronoturn dull whitish, the latter frequently tinged with 

 yellow behind. Corium entirely yellow, the costa and inner margin, and generally 



