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MILLIPEDS OF FAMILY LYSIOPETALIDAE — LOOMIS 123 



below it on the outer side. Below the lateral carinae there are two 

 very prominent primary crests, which are higher and more conspicu- 

 ous than any on the dorsum. 



Anterior subsegments with the channels on the posterior part 

 rather shallow, noticeably longer than broad, and separated by low 

 but distinct beaded lines ; reticulations in front of the channels coarse 

 and prominent, the longitudinal lines through the netting strongly 

 raised. 



Last segment with 10 setae in addition to the two apical papillate 

 hairs. 



Anal valves with the raised margins rather thin and strongly 

 elevated ; disk of each valve only a little inflated. 



Gonopods (fig. 16, a) with the large expanded apical portion of 

 each erect piece directed somewhat forward, the entire apical half 

 with large, very uneven serrations along the margin ; from the outer 

 side of the gonopods, opposite the base of the expansion, an ante- 

 riorly directed 3-pronged arm arises; of the two apical prongs the 

 longer points upward and the shorter points downward; below the 

 lower prong is a still smaller prong also pointing downward. 



Males with a comb of fine hairs on the under side of the last joint 

 of the first three pairs of legs; ensuing four pairs of legs with a 

 velutinous pad of hairs occupying the distal half of the under side of 

 the last joint, and on five or six pairs of legs following the genitalia 

 decreasingly smaller pads are present. 



Type.— Male, U.S.N.M. no. 1243. 



Remarks. — A number of specimens were collected from beneath 

 rocks on the north slope of Picacho Mountain, between Tucson and 

 Casa Grande, Ariz., February 7, 1926, by H. F. Loomis. Several 

 other female specimens appearing to belong to this species have been 

 collected at different times on a small mountain in the San Tan 

 Range, near Sacaton, Ariz. 



COLACTIS BABOQUIVARI, new species 



FiGiTEE 16, c, d; Plate 3, Figueb 4 



Diagnosis. — The short, stout, and cylindric body distinguishes this 

 species. The gonopods indicate relationship with saxetana, but this 

 is not so strongly borne out by the other characters. 



Descri.ption. — Body short and stout, 18 to 22 mm long iind 1.5 to 

 1.8 mm broad; cylindric, neither sex flattened; males slenderer and 

 very slightly more attenuated behind the head than the females; 

 segments 50 to 55 (pi. 3, fig. 4). 



Eyes triangular, the 32 to 45 ocelli in 6 or 7 rows ; sense organ small, 

 not larger than an ocellus, located in front of the fourth and fifth 

 rows of ocelli. 



