548 BRITISH LEPIDOPTEEA. 



a. On August 1st, 1882, I bred from larvae a hermaphrodite example of B. 

 nenstria, <? on the left side, ? on the right, the last especially well developed ; the 

 left antenna is pectinated, the right filiform ; the abdominal extremity terminated 

 by two orifices. The specimen is also remarkable for its coloration, the male side 

 being yellow, the other brown. The two colours are distinctly separated by a 

 longitudinal line that divides the body into two parts so exactly that the head par- 

 takes of both colours (Buchillot, Fe miles desJeunes Naturalistes, xii., p. 146). 



j3. The left side 2 , the right side s ■ In Staudinger's collection. Communi- 

 cated in lift. (Schultz, Illus. IVohenschrift fiir Ent., ii., p. 399). 



Variation. — The British imagines of this species vary, in both sexes, 

 from pale yellow- ochreous to deep rust-red, the forewings with two oblique 

 lines, or with a dark median band, or unicolorous. Of course, many 

 intermediate stages of colour and markings will be discovered if a large 

 number of specimens be examined, but the greater number will be 

 found to be included within the limits of the following table : 



Ground colour pale ochreous. 



(1) Pale ochreous, the forewings with two distinct transverse strigse = ab. 

 quercus, Esp. (= ab. quercina, Selys). 



(2) Pale ochreous, the forewings with the two transverse strigae united = ab. 

 ochracea-eonfiuens, n. ab. 



(3) Pale ochreous, the forewings with the space between the two transverse 

 strigae darker, and forming a median band = ab. annularis, Geoff. 



(4) Pale ochreous, the forewings with a median band broken centrally = ab. 

 ochraeea-fracta, n. ab. 



(5) Pale ochreous, the forewings with the lines and markings obsolete = ab. 

 ochraeea-unicolor, n. ab. 



Ground colour yellow or buff. 



(1) Yellow or buff, the forewings with two distinct transverse strigas = neustria, 

 Linn. (= bilineatus, Haw.). 



(2) Yellow or buff, the forewings with the two transverse strigas united = ab. 

 confluens, Selys. 



(3) Yellow or buff, the forewings with the space between the two transverse 

 strigae darker, and forming a median band = ab. virgata, n. ab. 



(4) Yellow or buff, the forewings w T ith the median band broken centrally = ab. 

 fracta, n. ab. 



(5) Yellow or buff, the forewings with the lines and markings obsolete = ab. 

 unicolor, n. ab. 



Ground colour pale fawn. 



(1) Pale fawn, the forewings with two distinct transverse strigae = ab. 

 cervina, n. ab. 



(2) Pale fawn, the forewings with the two transverse strigas united = ab. 

 cervina-confluens, n. ab. 



(3) Pale fawn, the forewings with the space between the two strigae darker, 

 and forming a median band = ab. cervina-virgata, n. ab. (= neustrius, Haw.) 



(4) Pale fawn, the forewings with the median band broken centrally = ab. 

 cervina-fracta, n. ab. 



(5) Pale fawn, the forewings with the lines and markings obsolete = ab. 

 cervina-unicolor, n. ab. 



Ground colour reddish-ochreous. 



(1) Eeddish-ochreous, the forewings with two distinct transverse strigae (often 

 paler than ground colour) = ab. vulgaris, Bork. 



(2) Reddish-ochreous, the forewings with the two transverse strigae united 

 = ab. rufescens-conflueiis, n. ab. 



(3) Eeddish-ochreous, the forewings with the space between the two transverse 

 strigas forming a median band = ab. rufescens-virgata, n. ab. 



(4) Reddish-ochreous, the forewings with the median band broken centrally 

 = ab. rufescens-fracta, n. ab. 



(-5) Reddish-ochreous, the forewings with the lines and markings obsolete = ab. 

 rufescens-unicolor, n. ab. ( = ? unicolor, Cyrilli). 



Ground colour rust-red or red-brown. 

 (1) Deep rust-red or red-brown, the forewings with two distinct transverse 

 strigae (usually paler than the ground colour) = ab. pyri, Scop. 



