80 PROCEEDINGS OF THE ACADEMY Of [1881. 



" Mo nth parts arranged for biting, Lalirum forming the ante- 

 rior portion of the epioranium, and divided into two rounded 

 extremities anteriorly by a mesial emargination, both liah^es ter- 

 minated by three pairs of teeth directed towards each other. 

 Mandibles beneath labrum, somewhat exserted, one jointed, elon- 

 gate, curved inwards, the outer side finely pubescent, the apex 

 armed with four large and five small, hard, brown teeth. Maxillse 

 two-jointed, basal joint C3-lindrical, curving slightly inwards, sur- 

 mounted by two apical pieces, the outer, longest and most slender 

 piece may be regarded as repi-esenting a palpus, w^hile the inner 

 one, which is shorter, terminating in a series of bristles, may be 

 regarded as the second joint of the maxilla;. The labium is an 

 oblong plate divided in the middle b}- a suture. The anterior 

 margin of each half bears three conical teeth. 



" The bod}" consists of twent^'-three somites; twelve principal 

 ones, to which the legs are attached, and ten smaller intermediate 

 and a caudal somite. Each principal or leg-bearing somite has a 

 quadrate sternum which is divided in the middle into two halves 

 by a median furrow ; the narrower intermediate somites have an 

 elongate, undivided sternum, while the sides are covered by a 

 triangular chitinous piece Attached to everj^ leg- 

 bearing somite except the first, behind and alongside of the inser- 

 tion of the legs are a pair of simple, hairj^ appendages. The anal 

 opening is on the ventral side of the bod}- covered hy a rhomboidal 

 almost semicircular plate, the lateral extremities of which extend 

 somewhat beyond the edges of the last dorsal scute. The dorsal 

 surface is covered b}'^ fifteen scutes which are slightly imbricated. 

 The hind margins of the scutes are but slightly emarginated. . . 



" Legs in twelve pairs, or three less than the number of dorsal 

 scutes : no pairs of legs corresponding to the fifth and eighth 

 dorsal and the caudal scutes. The first pair of legs are the 

 smallest, and including the tarsal joint, are four-jointed. The 

 fourth joint is the longest, the tarsal the shortest. The latter is 

 simply a little conical prominence on the outer face of which there 

 are attached two hooked claws 



" The conical caudal appendages are simply an eflerent appa- 

 ratus connected with two long caecal pouches which are filled 

 with a viscous spinning material. The eflerent duct ends between 

 two terminal bristles. 



" Besides the dorsal and sternal scutes there are pairs of liga- 



