THE MYKIAPODA OF NORTH AMERICA. 195 



Male: Coxae of third and fourth pairs of legs produced into short, 

 blunt, rounded lobes, that of the third more slender; femur of third and 

 fourth with an oval swelling, that of third largest; ventral part of the 

 posterior half of seventh segment produced into a short triangular 

 plate. Segments 50. Length, 55 inm ; width, 5" 1 " 1 . 



This species is described from a broken male specimen. The copu- 

 lation foot was not taken out, but what I could see resembles that of 

 caudatus and heilprini. I have named this species after its collector, 

 Mr. A. Duges. 



8. Spirostreptus otomitus (Saussure). 



1859. — Jul us otomitus Saussure. Linn. Ent., 330 (Cordova, Vera Cruz, San Andres, 



Tuxtla, Mexico). 

 1884. — Spirostreptus otomitus Preudlionnne de Bone. Aim. Soc. Ent. Belg., 69. 



Ace. 19811.. Truxillo, Honduras; C. H. Townsend. $ . 



Number of segments, 63; ocelli 42-5; antennae reaching third seg- 

 ment; length, 55 mm ; width, 3.2 umi . 



9. Spirostreptus surinamensis Brandt. 



1841. — Spirostreptus surinamensis Brandt. Recueil, 108 (Surinam). 

 1847. — lulus surinamensis Gervais. Apteres, iv, 185. 



Ace. 14420, New Granada, West Indies; U. S. Fish Comm. Male and female. 



Dark brown, anterior part of segments yellowish; antenna? and legs 

 reddish brown. Robust, anterior segments somewhat attenuated. 

 Vertex, especially along margin of first dorsal plate, rough, longi- 

 tudinal and transverse sulci distinct; clypeus very rough, emargina- 

 tion shallow. Antenna? reaching third segment in both sexes. Ocelli 

 65-70, in 7 series, arranged in an elongate-oval patch. Segments 

 scarcely segmented, appearing smooth and shining, but densely and 

 very lightly punctate; anterior part with a few concentric striae; pos- 

 terior striate beneath, striae disappearing before pore and forming a 

 row of dot-like marks. Lateral part of first segment tetragonal, slightly 

 produced anteriorly in the male, about 7 distinct sulci. Anal segment 

 obtusely angled, a transverse sulcus ; anal valves strongly margined, 

 convex; anal scale almost transverse. Repugnatorial pore small, 

 placed about on anterior third of posterior part. Legs long, extending 

 beyond sides of body. Segments, male, 62; female, 65. 



Male : Legs stouter than those of female ; first and second tarsal joints 

 with pads; these disappear about the thirtieth segment; ventral plate 

 of copulation foot very small, convex, sulcate, its base concave; ante- 

 rior copulation foot curled around basal part of posterior, which runs 

 along its anterior surface, end expanded and rounded, with a black, 

 short, pointed, upward and backward projecting lobe at its upper 

 exterior angle, its anterior surface corrugated, that part which curls 

 around posterior foot corrugated and with a few short bristles; posterior 

 foot appearing at upper third of anterior, decurved along its outer edge, 



