144 Psyche [December 



A NEW GENUS IN THE CHILOPOD FAMILY MECISTO- 



CEPHALID.E. 



By Ralph V. Chamberlin, 

 Museum of Comparative Zoology, Cambridge, Mass. 



The new chilopod genus here described is interesting in being the 

 third thus far known as belonging to the subfamily Arrupinse, 

 under which at present I group those mecistocephaloid forms hav- 

 ing the coxae of the second maxillae completely separated and the 

 palpus clawless, etc. It is based upon a good series of specimens of 

 a previously undescribed species in the collection of the United 

 States National Museum from South Celebes, where they were col- 

 lected at Bua-Kraeng, elevation 5,000 feet, by H. Fruhstorfer on 

 Februarys, 1896. 



Anarrup gen. no v. 



Body narrowed caudad. 



Head broader than in the Mecistocephalinse, evenly rounded 

 caudally. Frontal suture strongly marked. No indication of 

 sublateral teeth. Areolated region of clypeus a narrowed band at 

 anterior border, the non-areolated region not divided, its anterior 

 portion bearing numerous setse, thus contrasting sharply with the 

 condition in Arrup in which the non-areolated area is very short 

 and the setse sparse. 



Labrum tripartite, the median piece very narrow, the lateral 

 pieces with margin smooth, with cilia but little exposed. 



Mandible bearing several lamellae. Teeth of first lamella few 

 (four in genotype), stout. Teeth of median lamella on distal half 

 long, very short and small on proximal part. 



Palpus of second maxilla clawless; coxae meeting at middle, 

 separated by a rather long suture. 



Prehensors exposed from above; joints armed within. 



Ventral plate of pregenital segment narrow. Coxopleural pores 

 small and numerous. 



Anal legs composed of six articles beyond coxopleurae, unarmed. 

 Genotype. — A . nesiotes sp. nov. 



