DR A. WILLEY IN THE LOYALTY ISLANDS, NEW BRITAIN, ETC. 65 



Anal pleurae inflated, finely porous, encroaching upon the antepenultimate segment ; 

 anal tergite narrow, sternite wider than long; no anal pores. Anal appendages of male 

 two segmented ; legs of male not inflated. (Figs. 1 a — 1 b.) 



This interesting genus was previously only known from a couple of specimens, each 

 the representative of a particular species. Consequently up to the present time no 

 detailed information respecting the mouth-parts was forthcoming. 



Dr Willey, however, was fortunate enough to obtain several specimens of a third 

 species in New Britain. I have therefore taken the opportunity to make the necessary 

 dissection of the jaws and to supplement the diagnosis of the genus and family by 

 describing them. 



When establishing the family, Mr Cook, judging from the other structural features 

 of Gonibregmaius, ventured to prophesy that the mouth-parts of this genus would prove 

 to be peculiar. Examination has amply justified the prediction ; for in the formation 

 of its mandibles, which seem to retain a primitive bi-ramous character, Gonibregmatus 

 stands alone in the class Chilopoda. 



(11) Gonibregmatus anguinus, sp. n. 

 PI. VI, Fig. 1. 



Colour a uniform yellowish brown, with a bright red transverse band on the head. 

 Number of pairs of legs 129 $, 115 </. 



Length of % up to 130 mm., of J from 70-115 mm. 



Loc. New Britain. 



It is needless to describe this species in greater detail, since it appears to differ 

 from the two previously established species of the genus in the characters set forth 

 in the subjoined table : — 



(a) Prescutum of anal somite distinct, separated from the tergite behind it by 



a deep transverse groove; 161 pairs of legs in % cumingii, Newport, 



Philippine Islands. 



(6) Prescutum of anal somite either completely fused with the tergite or separated 

 from it by a shallow suture; 129-131 pairs of legs in °.. 



(a') Suture between prescutum and tergite persists as a shallow curved 



groove anguin us, sp. n. 



New Britain. 



(&') Suture between prescutum and tergite practically obliterated 



insidaris, Poc. 



Island of Saleyer. 



When comparing G. cumingii and G. insidaris on a previous occasion, I pointed out 

 what at the time appeared to be two differential characters for cumingii, namely, the 

 overlapping of the head-plate in front by the maxillipedes and the forward extension 

 of the anal pleurae nearly to the posterior extremity of the fourth somite from the 

 end. Both of these characters I now believe to be due to shrinking of the sclerites 

 owing to drying. 



W. 10 



