114 BULLETIN 46, UNITED STATES NATIONAL MUSEUM. 



4. Scolopendra macracanthus. sp. now 



Diagnosis. — Allied to Scolopendra subspinipes Leacli ; but tlie 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 immarginate. 



Type.— No. 165F. 



Habitat. — Pacific coast, some place between Lower California and 

 Straits of Magellan. 



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

 dorsal plates green; head and first dorsal plate darker. 



Eather slender, smooth, only lightly punctate anteriorly. 



Head suborbicular, punctate, not sulcate. 



Antenna?, 18-jointed; 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), marginate; 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? 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; first dorsal plate without a transverse 

 furrow; tarsal joints armed. 

 a. Femora of anal legs unarmed beneath, two spines within; the first 6-11 dorsal 



plates immarginate ; last two tarsal joints unarmed Dehaani. 



aa. Femora of anal legs armed beneath. 

 h. Spines of femora of anal legs 4-6, always two beneath; the first four or five 

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



St'BSPJNIPKS. 



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

 ginate ; the last tarsal joint unarmed Mackocanthis. 



5. Scolopendra microcanthus, sp. nov. 



Diagnosis. — Allied to Scolopendra pernix Kohlrausch, but the anal 

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



Type.— No. 600. 



Habitat. — St. Margarita Island, Lower California. 



Description. — Pale green, posterior border of segments dark; pre 

 hensorial legs orange. 



