114 PROCEEDINGS OF THE NATIONAL MUSEUM vol.84 



ward and forward. Base of the gonopods covered behind by two 

 thin, strongly chitinized, convex, kidney-shaped pieces joined on the 

 inner side at the middle by a yokelike structure, above which the 

 margins are connected by membranous tissue. In front of the base 

 of each gonopod is a very large globular structure with the inner 

 half chitinized, and the outer part more delicate and resembling an 

 inflated bladder. 



Apical joint of the female organs shown in figure 17, e. 



IMales with the outer joint of the first two pairs of legs bearing a 

 ventral comb of fine hairs. Under side of the last joint of all the 

 legs from the third pair to within 10 or 12 pairs of the posterior 

 end of the body occupied by a velutinous pad of uniform short hairs. 

 Seventh legs with the coxa prominently produced into an erect sub- 

 conic lobe. The anterior pair of legs of each midbody segment has 

 the coxal joints produced forward at the apex into a rather 

 long, slender, shoelike lobe, below which a sniall dense cluster of 

 long hairs projects obliquely upward nearly to the end of the lobe 

 (fig. 17,^). 



Females with comb of hairs on legs 1 and 2, similar to the males, 

 but the other legs are without special modifications. 



Ty^e.—Male, U.S.N.M. no. 1238. 



Reiimrlis. — Two mature males and mature females collected be- 

 side the Temescal Canyon Koad, near Corona, Calif., November 29, 

 1927, by Dr. O. F. Cook. 



DIACTIS TRIANGULA, new species 



Figure 17, a 



Diagnosis. — The outstanding differences between this species and 

 soleata are the less divergent primary crests of segments 2, 3, and 4 ; 

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

 ment 9 instead of on segment 8 ; and the shorter setae on the primary 

 crests near the middle of the body. 



Description. — Body 18 mm long and 1 mm wide; very little 

 depressed in the male; female not known; number of segments 49. 



Eyes composed of 39 ocelli in 9 rows; sense organ much larger 

 than an ocellus, occupying most of the space between the end of the 

 seventh row of ocelli and the base of the antenna but not encroach- 

 ing on the triangular outline of the eye. 



First segment with 18 crests, those on the sides a little longer than 

 the ones at middle, which extend across the basal fourth of the 

 segment; imier pair of crests parallel. 



Segments 2, 3, and 4 with the inner pair of primary crests 

 rapidly diverging from in front, the posterior ends about four times 

 more widely separated than the anterior ends; other outer crests 



