VOL. XII 



PROCEEDINGS OF THE NATIONAL MUSEUM. '213 



Ventral plates not sulcate; porous area suboval, much smaller on 

 posterior segments ; last ventral plate very wide, pilose, sides con- 

 verging. 



Posterior pleurae large, pilose ; pores large, concealed. 



Anal pair of legs G jointed, moderately crassate, joints all large, 

 densely pilose ; unarmed. 



Pairs of legs 9 G5. 



Length 50 mm ; width 1.55 mm . 



This species is described from an adult female. 



According to Meinert's diagnosis of the genus Schendyla this species 

 would be included under that genus ; but the three known species may 

 be separated by the following generic characters : 



a. Claw of maxillary palpus not pectinate, outer part of first pair of maxillae 



without a trace of a lateral process; labrum eutirely united, teeth 20-22, 



equal ; anal legs 6-jointed Nemorensis. 



aa. Claw of maxillary palpus pectinate; outer part of first maxillae with a small 

 lateral process; labrum free in the middle. 



b. Anal pair of legs 5-joiuted ; claw of maxillary palpus only pectinate under the 



apex; labral teeth about 15, equal ; iirst joint of anal legs almost coalesco 



with second Eximia. 



bb. Anal pair of legs 6-jointed ; claw of maxillary palpus, pectinate for its entire 

 length; labial teeth 8+10+8, the outer enlarged; first joint of anal legs 

 not coalesced with second Americanus. 



On account of these generic differences between the three species, 

 especially between the first and the last two, I have thought it best to 

 place americanus and eximia under the new genus Pectiniunguis, of which 

 americanus is the type, restricting Schendyla to nemorensis. 



The generic differences between americanus and eximia are no doubt 

 worthy of subgeneric rank, and I therefore propose the name Nan- 

 nopus for the reception of eximia. 



4. Scolopendra macracanthus sp. nov. 



Diagnosis.— Allied to Scolopendra subspinipes Leach ; but the femora 

 of anal legs armed beneath with three spines, of which the two anterior 

 are very large, the superior-interior surface armed with six spines ; the 

 first nine dorsal plates immargiuate. 



Type.— No. 1G5F. 



Hab. — Pacific coast, someplace between Lower California and Straits 

 of Magellan, 



Description. — Brownish-green ; tip of antenna? and lateral parts of 

 dorsal plates green ; head and first dorsal plate darker. 



Bather slender, smooth, only lightly punctate anteriorly. 



Head suborbicnlar, punctate, not sulcate. 



Antennae, 18 jointed ; articles moderate, the first six not hirsute. 



Prosternal teeth 5 + 5, the inner tw< 

 large, apex carinate, nodule present. 



