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MILLIPEDS OF FAMILY LYSIOPETALIDAE LOOMIS 119 



Transition to tlie full number of dorsal crests occurs on segment 11. 



On the caudal segments the primary crests are more conspicuous 

 and the secondary crests less so than on the segments farther for- 

 ward ; near the middle of the body the setae at the posterior ends of 

 the primary crests are about a third as long as the crests but on a few 

 of the last segments the setae are as long or a little longer than the 

 crests. 



Male and female organs as described for the genus and as illus- 

 trated in figure 17, j-l, and plate 3, figure 6. 



Males with a velutinous pad on the under side of the last joint of 

 the five pairs of legs preceding the gonopods and on several pairs 

 following them. 



Type.—M&\Q, U.S.N.M. no. 1241. 



Remarks. — Many specimens of both sexes were collected by Dr. 

 O. F. Cook, W. H. Jenkins, and H. G. McKeever, between Vallejo 

 and Cordelia, Calif, (type locality), January 4, 1928, and at Cordelia 

 and Davenport, Calif., in February 1929. 



TYNOMMA CONSANGUINEUM, new species 



Figure 17, g-i 



Diagnosis. — This species is very closely related to T. sedecimum 

 but differs in having larger eyes, two more crests on segment 1, and 

 the transition to the full number of dorsal crests occurring one seg- 

 ment farther back. 



Description. — Body of the largest specimen 18 mm long and 1.3 

 mm broad; number of segments 45 to 53. 



Eye cluster distinctly larger than in sedecimum., composed of 35 to 

 39 ocelli in 8 rows; sense organ in front of the fifth row of ocelli. 



First segment with 18 crests; no secondary crests between the 

 median pair of primary crests; the two outer crests on each side 

 longer than any of the other crests. 



Transition to the full number of dorsal crests occurs on segment 12. 



Male gonopods very similar to those of sedecimum.^ but the distal 

 half of the erect anterior piece on each side is abruptly attenuated 

 above the middle and the tip much slenderer (fig. IT, h). Posterior 

 gonopod with a slender 3-pointed branch from the bifurcate arm, 

 which is in the expanded apex (fig. 17, g). 



Outer joint of the female organs shown in figure 17, i. 



Type.— Male, U.S.N.M. no. 1242. 



Remarks. — Three males and two females collected in the Santa 

 Cruz Mountains, between Santa Cruz and Holy City, Calif., January 

 2, 1928, by H. G. McKeever. 



