154 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



Last segment punctate like the others except along the margins, 

 where it tends to become rugulose like the anal valves. The very 

 much shortened and narrowed segments at the end of the body are 

 also more minutely and indistinctly punctate. 



The anal valves are both punctate and rugose, the prominent 

 wrinkles being marked very often with distinct punctations. 



The same number of the segments, 48, was counted in four normal 

 individuals. A fifth specimen had only 47 segments and one of these, 

 the ninth, was distinctly shorter than its neighbors and was fused 

 with the tenth for a short distance; near the middle of the back. 



The repugnatorial secretion appeared unusually abundant and was 

 exuded very promptly, as soon as the animals were caught. Numer- 

 ous specimens were found crawling about on damp ground in a field 

 of sorghum a short distance to the northeast of the village of Fal- 

 furrias, Starr County, Texas. The species is evidently rare, or at 

 least not generally distributed, even in the immediate vicinity, for 

 no more specimens have been found in many subsequent visits that 

 have been made to the same neighborhood. 



Single individuals of Eurelus have been found in two other locali- 

 ties in south Texas, one collected near San Antonio by Mr. W. P. 

 Carr and another at Moore, Frio County, about 40 miles southwest 

 of San Antonio, by Mr. F. L. Lewton. 



A NEW GENUS FROM MEXICO, RELATED TO EURELUS. 



The U. S. National Museum contains four specimens of a small 

 milliped labeled as Spirobolus nietanus, Guanajuato, Mexico, prob- 

 ably identified by Bollman. 



These specimens are of interest as very near relatives of Eurelus. 

 Though hardly to be reckoned as members of the same genus, the 

 agreement is more complete than with any other type thus far 

 known. The form of the copulatory apparatus is much the same 

 and the third legs of the male are provided with coxal processes. 

 The following diagnosis and description refer mostly to the features 

 in which this Mexican type appears to diverge from Eurelus. 



CENTRELUS, new genus. 



Type. — Centrelus falcatus, a new species from Guanajuato, Mexico. 



Diagnosis. — Closely related to Eurelus. Differs in having the 

 body smaller, more slender and more cylindrical, the sterna nar- 

 rower, and the ventral striations very few and subtended by large 

 curved spines, especially on the posterior half of the body. 



Description. — Body rather small and slender, ten or twelve times 

 as long as broad, cylindrical, slightly wider in front, narrowed rather 

 gradually behind. 



