14 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.60. 



bj a little more than their greatest diameter (once and a sixth) ; 

 ocelli in six transverse, curving series, as 12, 11, 9, 7, 6, 3. CoUum an- 

 gled below on each side, corner behind angle obliquely excised and 

 the anterior corner widely excised. Above lower angle a series of 

 five longitudinal ridges uniting with the elevated margin anteriorly. 

 The lower angle not inflexed (pi. 6, fig. 10). Segmental furrow 

 deeply impressed across dorsum, its anterior face or wall subvertical, 

 its posterior one widely slanting. Surface caudad of furrow rough- 

 ened with densely arranged anastamosing rugae or ridges, which 

 are chiefly longitudinal and part of which cross the furrow^ to its 

 anterior edge. Surface in front of furrow similarly roughened, but 

 the ridges much finer. Metazonite deeply striate below, the striae 

 defined by ridges. Covered portion of prozonites marked with 

 transverse encircling striae, as usual. Pores beginning on sixth seg- 

 ment. Last tergite caudally obtuse, much exceeded by the valves. 

 Surface roughened with a dense network of fine rugae and crossed 

 between caudal end and middle by a transverse furrow, a smaller 

 furrow occurring also near the end. Mesal borders of anal valves 

 strongly compressed and elevated, in profile weakly convex. Anal 

 scale short and broad, caudally very obtusely angular, the surface 

 densely punctate. 



The gonopods as shown in plate G, figure 1. 



Number of segments, 59. 



Length, 80 mm. ; width, 5 mm. 



Locality. — Guatemala : Candalaria Eocks, Scamay Estuary, one 

 male, June, 1904 ; Trece Aguas, one lighter colored male, taken July, 

 1907. 



Type.— Cat. No. 824, U.S.N.M. 



28. GYMNOSTREPTUS PACIFICUS, new species. 



Plate 7, figs. 2-4. 



Olive, the caudal borders of segments ringed with fulvous or fulvo- 

 ferruginous. Legs reddish brown. Head smooth and shining. The 

 usual sulcus across vertex distinct. Eyes angled at mesal end. a little 

 more than their diameter (about once and a sixth) apart. Ocelli 

 in six or seven series, as 12, 11, 9, 7, 6, 4, 1. Collum a little inflexed 

 below, with lower inferior corner moderately produced, in the male 

 apically rounded. Above lower end with seven or eight striae, of 

 which the uppermost is deepest, the others decreasing in depth or 

 height of limiting ridge in going ventrad. The number of striae 

 in the female fewer — five or six (pi. 7, figs. 2 and 3). Metazonites 

 covered dorsally with a dense, close network of nigae. with meshes 

 punctiform or but little elongate. Prozonites without distinct rugae, 

 but punctate, the punctae fine. Pores smalL remote from the sulcus, 



