676 CHILOGNATHA. 



appendages." The two species, P. Huxleyi and P. peduncula- 

 tus of Lubbock are white, and about one-twentieth of an inch 

 in length. Lubbock regards this remarkable form as a "con- 

 necting link between the Chilopods and Chilog- 

 naths, and also as bridging over to a certain 

 extent the great chasm which separates them 

 from other articulata." No tracheae could be 

 detected. The six-footed young (Fig. 648) had 

 the first pair of legs attached to the first seg- 

 ment behind the head, the two other pairs to 

 the following one. The resemblance of Pauro- 

 pus to those Podurae, such as Achorutes, in 

 which the "spring" is very short, is certainly 

 Fig. 648. remarkable. We may, therefore, consider the 

 Pauropus as a connecting link between the Myriopods and 

 the Neuroptera. P. Lubbockii Pack., was found at Salem, Mass. 



CHILOGNATHA. 



IN this division of the Myriopods the body is divided into 

 numerous segments, each furnished with two pairs of short 

 legs, and the antennae are short, with but few joints. 



They are the lowest insects, and in Julus, with its large 

 number of rings of the same form, we have a good illustration 

 of the vegetative repetition of the zoological elements, or 

 segments, composing the bod} r , which is the reverse of what 

 obtains in the cephalized hone} 7 bee, for instance, and reminds 

 us strikingly of the Worms. In the genus Brachycybe, a remote 

 ally of Polydesmus, we are strongly reminded of some crus- 

 taceans, such as the Isopods, and the posterior end of the 

 body of this Myriopod, in the broad lateral expansions of 

 the segments, even recalls the tail of a trilobite. 



Wood states that the eyes are frequently absent, and when 

 present they are generally numerous and collected in patches 

 near the base of the antennae. The long, cylindrical-bodied 

 Julus is the typical form of the suborder, while the flattened 

 dilated Polydesmus is a more aberrant form. 



The mouth-parts are either, as in Julus, formed for feeding 



