i89f).] 25 ;i 



brown above, mucli whiter beneath, in the S ; abdomen greyish-brown, anal tuft 

 grejish-oehreous, both much paler beneath, in the ? . Posterior tarsi whitish, 

 dark-spotted above. 



Type— ^ , 5 (selected out of about 300 specimens bred from 

 cultivated pear trees at Corfe Castle Rectory), Mus. Baukes. 



Laroa — in a short mine on under-side of leaves of Pi/rus com- 

 munis and its cultivated varieties ; also found by myself at Corfe 

 Castle plentifully on Pyrus mains, and sparingly on P. aucuparia. 

 V — vi, ix — xi. 



Pupa — vi, X — iii. I have no note about the cocoon. 



Imago — iii — v, vi — viii. 



Sroods — two. Hibernates as pupa. 



Hah. — England, Dorset (Corfe Castle, abundant, E. B. Bankes), 

 Herefordshire (Tarrington district, scarce, J. H. Wood), Sussex 

 (Bognor and M^orthing, scarce, W. H. B. Fletcher). I have failed to 

 find, in the continental collections examined, any individuals that can 

 be referred to this species. 



Nearly allied to mespilella, Hb., but considerably larger (8 — 9 

 mm., as against 6"5 — 7'5 mm.), and very much darker, mespilella 

 being, in both sexes, rich reddish-orange, whereas in pijrivorella even 

 the ?, which is far lighter than the (J, is of a much more dusky 

 orange. Agniu, in pyrivorella there is usually a considerable space 

 between the apices of the first costal and the first dorsal white teeth, 

 and they very rarely unite to form an angulated fascia, whereas in 

 mespilella there is a more frequent tendency for these teeth to approach 

 one another nearly, and consequently they unite into a fascia rather 

 more often. Both species can be separated from their nearest allies 

 by the fact that the white teeth are rather broad, clear, and conspicuous, 

 combined with the facts that the basal streak, which is rather broad, 

 is of only moderate length and does not, as a rule, show any tendency 

 to unite with the first dorsal tooth, that there is rarely any indication 

 of a white line or spot on the dorsum near the base, and that the 

 posterior tarsi are, as a rule, dark-spotted above. 



Dr. Wood, failing to find any reliable distinctions between the 

 larvae or the male genitalia of mespilella and pyrivorella, is inclined to 

 regard the latter as a phytophagic race of the former. Whilst quite 

 admitting that pyrivorella may have originated thus, the imaginal 

 differences between it and mespilella, both in size and colour, and to 

 a less extent in tendency of markings, are quite as strongly marked 

 among specimens bred from larvae found feeding at larye on the same 

 individual tree, as between those bred from difterent food-plants ; 



