No. 1810. DESCRIPTIONS OF NEW MILLTPEDS— COOK. 159 



not indicated by a groove behind the pore as in 0. obustus. The 

 suture crosses the midbelt in an oblique direction, being turned or 

 bent downward to meet the pore, which appears to be set exactly 

 at the junction of the sutures. The ventral striations are much more 

 pronounced than in 0. obustus, with the ridges running out into 

 distinct teeth along the posterior margin. 



Last segment more produced and more angular at apex than in 

 0. obustus, and the surface rugulose-punctate, more distinctly than 

 the preceding segments. 



Anal valves somewhat more prominent than in 0. obustus, dis- 

 tinctly exceeding the apex of the last segment. Surface distinctly 

 rugulose-punctate, especially on the sides; margin fringed with a 

 row of short hairs. 



Preanal scale broadly rounded, but not thickened as in 0. obustus. 



The more angular first segment and the indistinct transverse con- 

 strictions are similar to those of the related Texan genus Eurelus. 



ONYCHELUS SUTURATUS, new species. 



Type. — Cat. No. 805, U. S. National Museum, collected at Fort 

 Huachuca, Arizona, by T. E. Wilcox. Accession No. 27626. 



Diagnosis. — Similar in size and general appearance to 0. dentatus, 

 but with the sculpture of the ventral surfaces coarser and more pro- 

 nounced and all the sutures marked by superficial grooves. 



Description. — Body about 43 mm. long, 4.6 mm. in transverse 

 diameter, and 4.2 mm. in vertical diameter, the segments being 

 appreciably depressed. 



Color, very dark green, nearly black. 



Clypeal foveolse four on each side, the inner pair very small and 

 crowded into the median suture, the next two pairs large and also 

 crowded toward the middle. Outer pair very small, near the margin, 

 remote from the others. 



Eyes composed of over 40 ocelli arranged in seven rows, 6, 7, 8, 7, 

 7, 5, 3, to form nearly circular clusters. 



First segment much as in 0. dentatus, but the lateral angles some- 

 what more produced and the anterior raised margin distinctly 

 narrower. Posterior margin distinctly striate on the sides and also 

 distinctly notched just above the corner. 



Segments nearly as smooth as in 0. obustus, very finely and irregu- 

 larly punctate-coriaceous, but somewhat less than in 0. dentatus. 

 Transverse constriction very slight, appearing to follow the suture 

 on the sides, passing a little in front of the suture above. All the 

 sutures, anterior and posterior, median, lateral, pleural and ventral, 

 are marked by distinct superficial grooves. The reticulate sculpture 

 of the ventral surfaces is coarser and more pronounced than in 

 0. dentatus, although the longitudinal striations are rather less 



