214 ALBATROSS EXPLORATIONS, INSECTS — HOWARD, 



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

 the third and indistinct on the posterior ; posterior border transversely 

 wrinkled. 



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

 sides converging, posterior border rounded. 



Second torsal 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 pleurae densely porose; angular process small, bifid. 



Length 120 ram . 



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 trans- 

 verse furrow ; tarsal joiuts armed. 



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



plates immarginate; last two tarsal joints unarmed Dehaani. 



act. Femora of anal legs armed beneath. 



b. 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. 



Sul)8jfinipe8. 

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

 ginate ; the last tarsal joint unarmed Macrocanthus. 



5. Scolopendra niicrocanthus sp now 



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

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



Type.— No. COO. 



Uab. — St. Margarita Island, Lower California. 



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

 hensorial legs orauge. 



Slender; smooth, very lightly punctate. 



Head suboval, punctate; sulci absent. 



Autenme 25-29-jointed, long, basal not very crassate, the first 3 or 4 

 smooth. 



Prosternal teeth 4-f4 inner coalesced ; coxal tooth large, inner mar- 

 gin unarmed. 



The first 15 dorsal plates immarginate; sulci well developed, aud 

 commencing at transverse suture of first plate and dividing them into 

 three planes. 



Sulci of ventral plates shallow, last plate short and wide, sides con- 

 verging, rounded, posterior margin emaiginate. 



Second tarsal joints of all legs, except anal, armed. 



Anal pair of legs slender as in heros ; spines very small; 8-12, in 3 

 or 4 series on the superior-interior surface; 4 or 5 in 2 series on the 



