GEOMETRID.'E. ACIDALIA. 313 



scure pale wave beyond, near the hinder margin, the latter immaculate ; cilia 

 also with fuscous irrorations: posterior wings nearly similar. Female paler, 

 with the transverse strigse more distinct than in the male, especially the third 

 from the base. 

 In some instances the two anterior strigas are united into a single indistinct 

 fascia. 



Taken first in Scotland, afterwards in Cumberland and West- 

 moreland, in June. " Near Asliburton, Devon.'" — Messrs. Chant 

 and Benilei). 



C. Posterior tibiae of the males without spurs ; of the females with one pair at 

 the apex, and a second in the middle. 



Sp. 10. lactata. Alls albidis, strigd anticd saturatiore,duabusque aliis communibus 



validioribus. (Exp. alar. 1 unc. 1—2 lin.) 

 Ph. lactata. Haworth.—Vi. lactata. Steph. Catal. part ii. p. 152. No. 6724. 



Wings whitish ; the anterior with an oblique, nearly straight striga towards the 

 base, a second slightly waved common one in the middle and a third, also 

 common, more distinct, and very much waved, between the last and the hinder 

 margin ; and behind this, in fine specimens, another more or less distinct, 

 composed of fuscous clouds, and on the hinder margin a row of very minute 

 black dots. 



Variable as to the position of the strigs, and a little in colour: in some cases the 

 two basal strigae of the anterior wings are united towards the middle and form 

 an X, in others the second and third strigae only exist. These varieties form 

 the Ph. sublactata, Haworth.— Steph. Catal. I. c. No. 6725. In some instances 

 the hinder margin is free from strigse or clouds ; in others it is considerably 

 clouded:— the posterior wings have always a central dot, but the anterior are 

 frequently destitute thereof; and the row of black dots on the hinder margin 

 is sometimes wanting. 



Common in woods throughout the metropolitan district in June. 

 " Epping-.^' — Mr. Douhleday. 



Sp. 11. floslactata. Alisjloj-is lactis colore, fusco minutum atomosis, strigis 



undulatis quatuor saturatiorihus. (Exp. alar. 1 unc— 1 unc. 1 lin.) 

 Ph. floslactata. Haworth.— ?t. centrata. Steph. Catal. part ii. jo. 152. No. 6726- 



Wings creamy-white, with minute remote fuscous atoms, and with four darker 

 strigae, disposed in pairs, the two first before the middle, the other two behind 

 and considerably undulated : on the hinder margin is sometimes a row of 

 minute black dots, but it is generally immaculate. 



Haustellata. Vol. III. 31st July, 1831. y 



