4 G. II. CARPENTER. 



The labrum (tig. 8) is narrow and rounded in front, and bears a proximal row of four 

 and a distal row of three long bristles. 



The jaws are in many respects highly remarkable. The mandibles (figs. 3,4) have 

 four strong teeth at the apex, and a very well-developed molar area, the teeth at its 

 distal region being especially strong. At the proximal end of the molar area are two 

 prominent recurved hooks directed dorsalwards. On the outer edge of the mandible is 

 a strong " shoulder," and just proximal to this a rounded " boss." The large basal 

 extension of the mandible so characteristic of the Collembola generally is entirely 

 wanting in the present genus. At first I could not believe this to be so, supposing 

 that the basal region had somehow got destroyed in the specimens that I was 

 examining. But on finding the mandibles in all the specimens in exactly the same 

 condition, I can only conclude that this insect shows a modification of the jaws unique 

 in the Collembola, As the muscles are usually attached to this missing basal part of 

 the mandible, fresh specimens of the present genus would be especially welcome 

 subjects for anatomical research. 



The maxillulae (fig. 5) are also very remarkable on account of their likeness to the 

 mandibles. I have not succeeded in isolating these appendages, but one of the heads is 

 so transparent that their shape can be easily seen. At its apex the maxillula has three 

 delicate pointed teeth, while the inner edge of the base carries, not, as is usual, one row 

 of spines, but four rows of short denticles, forming a molar area analogous to that of 

 the mandible. I have not succeeded in seeing the tongue (hypopharynx) so that I 

 cannot state whether the relation of the maxillulae to that structure is of the usual 

 nature or not. In this genus they are more unmistakably a pair of jaws than in any 

 Collembolau that I have examined. 



Each maxilla (fig. 6) has a " head " of the usual Collembolau form with a two- 

 toothed galea (//) and three internal lamellae (/) ; on account of their delicate texture 

 these latter structures are somewhat shrivelled, and the shape given to them in the 

 figure may be inaccurate. The base of the maxilla (fig. 6, st) can only be traced a 

 short distance into the head capsule, but I cannot satisfy myself that the cardo, 

 with its usual associated sclerites, is absent. There is a blunt palp (fig. 6, ]>} carrying 

 three or four bristles at its tip. 



The second maxillae combine, as is usual in the Collembola, to form a transverse 

 liiliiiiin (fig. 7) with alternating narrower and broader lobes, carrying long bristles. 



Legs. The legs (fig. 9) are of the usual Collembolan form. The tibio-tarsus 

 cariies a simple pointed claw without trace of tunica, and a small rounded empodiuni 

 without appendix. There are three elongate teneut hairs, without terminal club, 

 springing from large circular depressions of the cuticle. 



Ventral Tube. The ventral tube (fig. 10) on the first abdominal segment is 

 abrupt on its front and rounded on its hinder face, beset with numerous bristles like 

 those of the cuticle generally. It appears to be in the undeveloped state characteristic 

 of the section l<> which this genus belongs. 



