A NEW AND ANNEOTANT TiPE OF CHILOPOD. 425 



With the fourth group, Scutigeromorpha, no comparison of 

 Craterostig-mus will be necessary, since the only morpho- 

 logical points the two have in common, apart from those 

 shared by all Chilopods, are those mentioned in the statement 

 of the resemblances between Craterostigmus and the 

 Lithobiomorpha. 



One or two of the features of Craterostigmus, namely, the 

 armature of tlie posterior legs, the structure of the mandibles, 

 etc., have been omitted from the list detailing the peculiarities 

 of tbis genus, as of doubtful taxonomic value, although the 

 structure of the mandible is likely enough to prove of high 

 importance in this particular. 



1. Characters in which Craterostigmus resembles the 

 Lithobiomorpha and differs from the Scolopendro- 

 morpha and Geophilomorpha. — The completeness of the 

 penultimate and antepenultimate segmeuts of the toxico- 

 gnaths, so that the femoral segment and fang are separated 

 from each other on the outer (post-axial) side of the appendage; 

 the presence of fifteen sternal plates and of fifteen pairs of loco- 

 motor appendages, with relatively large basal segments ; the 

 distinctness of thecoxaof the fifteenth pair of legs; the presence 

 of six pairs of stigmata on the somites represented by the 

 third, fifth, eighth, tenth, twelfth, and fourteenth pairs of legs ; 

 the presence of a single monomeniscous eye on each side of 

 the head, as in the genera Henicops and Cermatobius. 



2. Characters in which Craterostigmus resembles the 

 IS c o 1 o p e n d r m o r p h a and differs from the Lithobio- 

 morpha and Geophilomorpha. — The co-existence of large 

 dentate prascoxal and femoral processes on the toxicognaths^ 

 as in tScolopendra, Otostigmus, etc. The presence of 

 twenty-one tergal plates. The presence of a large and dis- 

 tinct metastigmatic pleural sclerite, and the increase in size of 

 the prajcoxal sclerltes towards the posterior end of the body. 

 The fusion of the trochanter (second segment) of the legs of 

 the fifteenth pair with the femur. 



3. Characters in Avhich Craterostigmus resembles all 

 or some Geophilomorpha, e. g. Mecistocephalus, and 



