426 K. 1. POCOCK. 



differs from the Scolopeudromorplia and Litliobio- 

 morplia. — The hirge size of the toxicognaths and the extent 

 to which they overlap the cephalite anteriorly and laterally ; 

 the presence of a distinct, snbquadrate, basal plate, which is 

 much narrower than the terginn ot" the first leg-bearing somite 

 and intervenes between it and the cephalite ; the entirety of 

 the distal segment of the penultimate pair of legs. 



4. Characters in which Craterostigmus resembles the 

 Scolopendromorpha and Greophilomorpha and differs 

 from the Lithobiomorpha. — The enlargement of the 

 tergum of the first leg-bearing somite ; the size and com- 

 pleteness of the fusion of the two halves of the coxal plate of 

 the toxicognaths; the relative equality in size between the 

 coxa3 of the legs ; the presence of the prassternal sclerites 

 upon the ventral area of the somites. 



5. Characters in which Craterostigmus resembles 

 some or all of the Lithobiomorpha and Scolopendro- 

 morpha and differs from all the Geophilomorpha. 

 — The number of antennal segments exceeding fourteen; 

 the presence of eyes ; the inequality in size of the terga ; 

 the terga, sterna, and pairs of legs falling short of thirty- 

 one; the reduction in the number of stigmata, which fall 

 short of half the number of somites ; the spine armature 

 of the legs. 



6. Characters in which Craterostigmus resembles 

 the Lithobiomorpha and Geophilomorpha and 

 differs from the Scolopendromorpha. — The presence 

 of a distinct '' basal plate " separating the cephalite from 

 the tergum of the somite bearing the first pair of legs ; 

 the inability to withdraw the anal and genital somites within 

 the somite bearing the legs of the last pair. 



7. Characters in which Craterostigmus differs 

 from all other known Chilopoda. — The fact that 

 the pleural sclerite of the toxicognath covers only the posterior 

 portion of the upper surface of the coxal plate on each side, and 

 falls far short of the proximal end of the femur; the numerical 

 excess of the terga over the sterna, the pairs of legs and the 



