A [Junuar)', 



Phalidurines, trib. nov. Amj'cteridarum, 



Maris segmeyito ultimo ventrali lateribus ad super/iciem corporis excurventi- 

 bus, pb(s minusve lyrolomjatis. 



The tribe besides having the apices of the last ventral bronght to 

 the surface (either as a branch of a visible pair of forceps or as a minute 

 hard tubercle) has a process attached internally to the membrane at the 

 base of this sternite, giving attachment to large muscles. 



There are known to me four forms of the tribe, two having the last 

 dorsal plate (tergite) very highl}^ modified and prominent, so that it 

 projects between the blades of the forcejis of the last ventral ; while 

 in the other two the modification of this tergite is less, so that it does 

 not actually penetrate between the forceps. 



They may be tabulated as follows : — ■ 



1 (4) Last dorsal plate swollen so as to penetrate ljetv;een the projecting pro- 



cesses of the last ventral. 



2 (o) Forceps of last ventral elongate and linear Phalidura. 



3 (j2) Forceps of last ventral thick, short, looking like a clenched nail. 



EUSTATIUS. 



4 (1) Last dorsal plate so folded as to be placed heliind the ventral processes. 



5 (()) Ventral processes (usually long) connected basally only by membrane, 



APHALIUUIIA. 



6 (5) Ventral processes connected at base by a transverse bar. 



Phophalidura. 



Phaliduua Fisch. (1823). 



This genus contains the largest and most highly-developed forms of 

 the family. The abdomen is capable of great flexion, so -that the long- 

 forceps can be directed forwaixls. In order to permit this, the penultimate 

 tergite is remarkably elongate ; the blades of the forceps sometimes have 

 a small lamina, sometimes are quite destitute of one. 



The type of the genus is P. reticulata Boisd. (= onirahilis Mac- 

 • Leay, nee Kirby). It includes groups 1 and 2 of Ferguson's revision, 

 and probably most of his other species as far as grouj? G. 



EusTATirs, gen. nov. 



Maris seymenio tdtimo ventrali prucessum crassmn Jiaiid prominulum 

 formante. 



This is a squat black insect of peculiar shape, with the last dorsal 

 plate turned to the under surface of the body and there exposed to the 

 length of 1| mm. ; at its sides the ends of the blunt forcejjs are exposed, 

 and look like clenched nails. These processes on dissection are found to 



