18 CHILOPODA. 
7. Scolopendra tenuitarsis, sp. n. (Tab. II. figg. 5, 5 a-d.) 
Colour olivaceous or ochraceo-olivaceous ; under surface deep ochraceous ; antenne and legs distally olivaceous. 
Body robust and approximately parallel-sided. 
Head about as wide as long, obscurely punctured, and with an indistinct median longitudinal sulcus, posterior 
border straight. 
Antenne short, attenuate, composed of about 22 segments, whereof the basal four are naked and the rest 
pubescent. 
Mazillipedes obscurely punctured; prosternal plates elongate, contiguous, with straight anterior border, 
furnished with four blunt teeth, whereof the three internal are close together and the external separate. 
Tergites: the first marked in front by a transverse sulcus, which is situated at some distance behind the 
posterior margin of the head; from the third to the twentieth bisulcate, the nineteenth, twentieth, and 
twenty-first with raised margins. 
Sternites smooth, second to the twentieth bisulcate. 
Anal somite: tergite with a median sulcus, much wider than long; plewre porous throughout, except the 
posterior border and the process, which are smooth, posterior border bearing one or two spines, the process 
long and slender, bearing one lateral and about six apical and subapical spines ; sternite somewhat wide, 
its sides very gently converging, with straight or slightly concave hinder margin ; legs of moderate length, 
the basal segments stout and the tarsal segments slender ; femur flattish, but with rounded margins, armed 
with about 23 or 26 small spines, arranged in longitudinal series approximately as follows—2, and 1 
beneath them on the upper-inner edge, 4 on the inner surface, 6 or 7 in two irregular series on the under- 
inner edge, 2 or 3 on the under surface, and 4 or 5 and 4 on the under-outer edge; the process well 
developed and tipped with two spines; the lower surface slightly excavated anteriorly ; the patella parallel- 
sided, a little wider than the femur, with rounded margins, but lightly and widely excavated above; the 
tibia elongately piriform, its proximal end being much wider than the distal end, flat or lightly excavated 
above, sparsely pubescent ; tarsal segments somewhat stout, but much slenderer than the tibia, cylindrical, 
pubescent, unarmed ; claw spurred. 
Legs with spurred claws, and, except the twentieth pair, with spined proximal tarsal segment. 
Length 39 millim. 
Hab. Mexico, Omilteme in Guerrero 7000 to 9000 feet (HZ. H. Smith). 
Three examples, found under rotting logs. Unfortunately only one of them is 
furnished with its anal legs; it is consequently impossible to judge of the constancy 
of the peculiarities presented by these appendages. This character may be sexual, but 
at all events it serves to distinguish the specimen presenting it from all the others that 
have been hitherto described. 
8. Scolopendra heros. (Tab. I. figg. 12, 12 a-c.) 
Scolopendra heros, Girard, in Marcy’s Rep. Expl. Red River, p. 272, t. 18 (1853) 1; also of Wood, 
Porath, Meinert, &c. 
Scolopendra castaneiceps, Wood, Proc. Ac. Phil. 1861, p. 117; Trans. Am. Phil. Soe. xiii. p. 156, 
t. 1. fig. 1°. 
? Scolopendra polymorpha, Wood, op. cit.* (testibus auctoribus). 
? Scolopendra mysteca, Humb. & Sauss. Rev. et Mag. Zool. 1869, p. 157°; Miss. Sci. Mex., 
Myriop. p. 130 (1872) °. 
Hab. Norta America ! 4, Texas *.—Mexico ° °, Presidio (Forrer), San Miguel (coll. 
Kisen). 
This handsome species is so well known that no detailed description of it is here 
