MR. LUBBOCK ON THE THYSANURA. 593 



The labrum is somewhat broadei* at the base than at the free extremity, which ends 

 in three not very well-marked lobes on each side ; there is also a curved row of teeth, 

 wliich, however, do not meet in the middle, nor project beyond the edge. 



The mandibles (PI. LIX. fig. 6) are powerful, and have respectively four and five teeth, 

 which are strong, though not very sharp. In general form, and in the position and 

 arrangement of the molar surface, they are formed on the type common to the Fo- 

 duridcB. 



The maxillse also resemble in general outline those of the allied species. At their 

 extremity is a row of five processes. The three outer ones have the form of strong teeth ; 

 the two inner ones are pointed, tongue-shaped processes, serrated on their inner margin. 

 At the side of these are two other lobes : one of these is long, narrow, pointed, and 

 generally lies, as it were, across the top of the organ ; it is serrated at its free extre- 

 mity on the inner edge. The other lobe is large, and ends in a tooth pointing inwards ; 

 the outer border is arched, the inner straight. It is, however, by no means easy to 

 make out these different processes in a satisfactory manner. 



The appendage, which for the present I will caU the palpus, is quadrate, but roimded 

 off at the angles, and tapers slightly towards the apex. The apical margin is somewhat 

 concave. The palpus has on one side a small process, which terminates in a stout bristle. 

 At the base of the process is another stout seta, in addition to which the organ bears 

 three smaller hairs. 



The second pair of maxiUa? are membranous, have the ajoical margin excavated, with 

 a tooth at the inner angle. 



The eyes are arranged as usual in the genus, and are pretty even in size. The an- 

 tenna, which is inserted just in front of the " quadrilateral," must somewhat obstruct 

 the field of view. 



The foot (PI. LIX. fig. 5) of the anterior leg possesses, as usual, a tenent hair and 

 two strong claws. The larger claw has a strong spine on the outer margin near the 

 base, and two smaller ones on the inner margin, which are situated at almost equal 

 distances from one another and from the two extremities. Near the tip is sometimes 

 an indication of the third spine which we find in O. cincta. 



The small claw is lanceolate and simple. Near the base, however, and on the inner 

 margin, is the rudiment of a tooth ; but in many cases it is very difficult to perceive. 



All the three legs are alike, so far as the constitution of the foot is concerned. 



The caudal appendages end in a claw (PL LIX. fig. 7), which is curved downwards 

 and has on the under surface a strong tooth. To see this properly, however, the organ 

 must be seen from the side. 



In this species I have found Oregarinas. They were of two forms, either round or 

 elliptic. The latter appeared to be generally, if not always, united in pairs. 



Degeeria. 

 Degeeria nigromaculata {Fodura nigromamilata, Temp.). Body fusiform, pale greenish 

 yellow or stone-colour. Head rounded, with a black fascia anteriorly, including 

 the eyes. The posterior ends of the second, fourth, and fifth segments with a 



4 k2 



