Packard. | 182 [June 16 
Cambala Gervais, Aptéres, iv, 134, 1847. Exped. & l’Amer. du Sud 
(Castelnean), Myriop., 17. 
Reasia Sager, Proc. Acad. Nat. Sc., Phil., 109, 1856. 
Spirostrephon Wood, Myriop. N. Amer., Trans. Amer. Phil. Soc., 192, 1865. 
Cope, Proc. Amer. Phil. Soc., 179, 1769. 
Ryder, Proc. U. 8. Nat. Mus., iii, 526, 1881. 
Not Cambatla Gray, Griffiths, Cuvier, An. King. Ins., pl. 135, fig. 2, 1882. 
“ Reasia Gray. 
“© Reasia Jones, Todd’s Cyc. Anat. Art. Myriop, 546. 
Body-segments numbering as many as upwards of 60, with as many as 
115 pairs of legs ; the body unusually long and slender, tapering gradually 
towards the subacute tip. Head with the front flat, high and narrow, 
more so than usual; the eyes in a rectangular triangle, composed of as many 
as 40-41 facets, and not depressed. Antenne rather long, the joints subcla- 
vate, joint 6 not much longer than 4; joints 3 and 5 of the same length ; 
joint 6 rather thick at the end; joint 7 short, thick and conical, much 
more so than usual. 
Body-segments swollen and full, becoming suddenly depressed on the 
front edge ; the swollen portion with numerous raised lines or ridges, with 
deep concave valleys between ; the ridges projecting behind in an acute 
point. The segment next to the head rather narrower than the head, with 
the posterior two-thirds ridged ; the sides of the segments are somewhat 
swollen high up on the sides, but not so conspicuously as in Pseudo- 
tremia. Legs rather stout, and larger than in Pseudotremia; the first 
pair rather short and broad, with regular comb of stiff setse on the inner 
edge of the terminal joint. The seventh and ninth pairs of legs, 7. ¢, the 
pair immediately preceding and following the genital armor, are like the 
others, not being in any way modified as in Pseudotremia, etc. The gen- 
ital armature is large and better developed than in any other genus of the 
family ; the outer lamina large, stout, spatulate-mucronate at the tip; 
inner lamina much shorter than the outer, and with two long acute forks ; 
repugnatorial pores difficult to find. 
The genus may be recognized by the long, slender body, tapering to a 
point, and by the very short conical seventh antennal joint; by the ribbed 
swollen segments, which are very numerous ; by the seventh and ninth 
pairs of legs being normal, like the others, and by the short, broad first 
pair, with the regular comb of setee on the terminal joint. 
The genus as here defined will apply to the two Southern European 
species Lysiopetalum carinatum Brandt and L. iélyricwm Latzel, except that 
they are setose, while our species is not. Iam indebted to Dr. Latzel for 
specimens for comparison. 
In proposing the genus Spirostrephon, Brandt (Bull. Se. Acad. St. 
Pet., 1840), regarded Say’s Julus lactarius as the type species, and adding 
that the eyes are in a triangular area, he indicates its generic difference 
from Oambala annulatus, with which it has been so often confounded. 
Although I had originally retained Brandt’s name Spirostrephon for our 
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