OF MAX1LLDL.E IN THE ORDERS OF INSECTS. 



433 



occurring feature is the presence of a fringe of tooth-like projections or of 

 setpe along the inner margin. 



Isotoma palustris was regarded 03- Carpenter (6) as possibly one of the 

 least specialised Collembola. He described at the apex of the maxillula an 

 indication of cleavage into two lobes. Of the Achorutidre Anurida maritima 

 is the subject of Folsom's well-known work of 1900. Reference has already 

 been made to his conclusions with regard to the nature of the superlinguse. 

 An exact account of their structure is to be found in the Monograph 

 oE limns (24). 



DERMAPTERA. 



Forficula. — In his paper on Hemimerus talpoides, Hansen (22) devotes 

 considerable attention to the hypopharynx and maxillula? which ho describes 

 and figures in detail (pp. 70, 71, fig. 10). I have also been able to examine 

 the hypopharynx of specimens of Hemimerus hanseni, Sharp, kindly deter- 

 mined by Professor Carpenter and collected by Dr. J. W. S. Macfie at 



Text-fie. 3. 



Forficula miriculariu. Dorsal aspect of tongue, x 80. b. Brush-like sclerite. /. Asym- 

 metrical fold in dorsal wall of hypopharynx. /;. Hypopharynx. 711. Maxillula. 

 11. Chitiuous plate in inferior wall of pharynx, p. Transverse skeletal bar. 

 (i.tn. Chitinous rod in outer wall of maxillula. 6-. Small sclerite. 



Accra, Gold Coast. I found it essentially similar to that of Forficula. The 

 main differences concern the degree of fusion of the maxilluhe with the 

 hypopharynx, and the details of construction of the transverse elements of 

 the skeletal support. 



We find in Forficula a roughly oblong tongue (text-fig. 3) lying above the 

 labium. It is produced distally into a median (/(.) and two lateral («i.) mem- 

 branous lobes, corresponding to the hypopharynx and maxillula; respectively 



