114 BULLETIN 46, UNITED STATES NATIONAL MUSEUM. 



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 \vith six spines; the 

 first nine dorsal plates imma.rginate. 



Type. So. 1C5F. 



Habitat. Pacific coast, some place between Lower California and 

 Straits of Magellan. 



Description. Brownish-green; tip of antenna 1 and lateral parts of 

 dorsal plates green; head and first dorsal plate darker. 



Rather slender, smooth, only lightly punctate anteriorly. 



Head suborbicular, punctate, not sulcate. 



Antenna 1 , 18-joiuted: articles moderate, the first six not hirsute. 



Prosternal teeth 5 + 5, the inner two small and coalesced; coxal tooth 

 large, apex carinate, nodule present. 



Dorsal plate, except the first nine (10), margiuate; sulci beginning 

 at the third and indistinct on the posterior; posterior border trans- 

 versely wrinkled. 



Sulci of ventral plates distinct; last ventral plate long and narrow, 

 sides converging, posterior border rounded. 



Second tarsal joint of all the legs, except anal, armed beneath with 

 a spine. 



Anal legs long, slender; femora, with six spines on the superior inte- 

 rior surface, arranged in three series; three beneath, uniseriate, the 

 anterior two largest: apical process bifid. 



Posterior pleura. 1 densely porose; angular process small, bifid. 



Length 120""". 



In the collection is a specimen without a more definite locality than 

 '- Pacific coast." 



The following key will help to separate it from the related species: 



Femora of penultimate pair of legs unarmed; lirst dorsal plate without a transverse 



furrow; tarsal joints armed. 

 . Femora of anal legs unarmed beneath, two spines within; the lirst ti-11 dorsal 



plates immarginate ; last two tarsal joints unarmed DEIIAANI. 



ad. Femora of anal legs armed beneath. 



1>. Spines of femora of anal legs 4-6, always two beneath; the tirst four or rive 

 dorsal plates immargiuate; the last or the last two tarsi unarmed. 



SUBSPINIPKS. 



1>I>. Spines of femora of anal legs 9, 3 beneath; the first nine dorsal plates immar- 

 giuate; the last tarsal joint unarmed M.U'KOCAMIHS. 



5. Scolopendra microcanthus, sp. nov. 



Diagnosis. Allied to Scolopcmlra fn-nii,! 1 Ivolilrausch, but the anal 

 pair of legs slender, spines small, and more numerous. 



Type. No. 000. 



Habitat. St. Margarita Island, Lower California. 



/><'*a-ii>ti<i. Pale green, posterior border of segments dark: pie 

 hensorial legs orange. 



