372 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



ings of the maxillary pockets, which acquire a secondary 

 connection and ultimate fusion with the lingua. 



The first maxillse (figs. 11 and 14) each consist of an 

 apical portion or " head," which articulates by means of a 

 hinge joint with a long stalk-like stipes (st.). Each stipes 

 in its turn articulates with a shorter piece, which is 

 termed the cardo (car.), whose opposite extremity is 

 attached to the proximal end of the lingual stalk of its 

 side. The " head " of the maxilla consists of three parts. 

 The uppermost of them is a thinly chitinised mem- 

 branous lamella, which is finely serrated along its inner 

 margin and appears to correspond to a greatly modified 

 palp (pip.). Underneath the palp is situated the galea 

 (gal.) ; it is the most massive piece of the three, and is 

 armed with strong teeth. The third piece is the lacinia 

 (lac), which very closely resembles the palp in form, but 

 is rather more deeply toothed. The existence of a palp in 

 the adult insect seems to have been overlooked by Eolsom, 

 notwithstanding the care with which he studied the 

 mouth-parts and the fact that it has been figured by 

 Fernald (8, pi. xlviii., fig. 9). The latter author, however, 

 made no suggestion as to its homologies. Its presence in 

 the embryo Anurida is described and figured by Folsom, 

 who adds that in the newly-hatched insect no trace of a 

 palp can be made out, and he concludes that it must have 

 been resorbed. The palp is frequently difficult to make 

 out as it usually lies closely apposed to the sides of the 

 galea, and in this position it is easily overlooked on 

 account of its extreme transparency. Like the mandibles, 

 each maxilla lies in a separate pharyngeal pocket, which 

 is situated somewhat ventrad of the mandibular pocket of 

 its side (Plate IV., fig. 35). 



The second maxillse or labium form practically the 

 whole of the ventral region of the head. Although they 



