I. TRÄGÅRDH, LEPIDOPTEROUS LEAF-MINERS. 



21 



metimes slightly convex. In Ornix sp. (fig. 30) the labrum 

 is of the same type, but the incisions are much deeper, and 

 divide the labrum into three lobes, the two lateral ones of 

 which are rounded anteriorly, and project forward beyond 

 the median lobe which is constricted at the base, and tapers 

 towards the rounded top. 



Fig. 31. Ornix guttea. Anterior part of the head, dorsal aspect. X 400. 



Fig. 32. Gracilaria syringella. » » » » * * X 386. 



Fig. 33. Lithocolletis sp. » » » » » » f X 62 °- 



Fig. 34. Phyllocnistis suffusella. Labrum, dorsal aspect. X 250. 



This trilobate type of the labrum depends probably on 

 the development of the large tufts of hairs at the antero- 

 lateral angles of it, and which continue on the ventral side, 

 forming two longitudinal ridges converging backwards. 



In the sap-feeders we find the most highly specialized shape 

 of the labrum. The most primitive of these is Ornix guttea (?) x 



1 The species has not been bred, and its identity is therefore not 

 quite certain. 



