126 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lu 



margin of segments as a series of 6 to 10 sharp upcurved spines. 

 Ventral surface of mesozonites in front of the ridges with a distinct 

 reticulate pattern of fine striae, the striae merging dorsally into trans- 

 verse parallel ridges that fade out near the level of the ozopores. 

 Transverse sutures very distinct; metazonites slightly elevated. 



Three segments in front of the telson strongly telescoped. Telson 

 bluntly acuminate, equalling but not surpassing the anal valves, 

 latter smooth and evenly convex, with their ventrolateral corners 

 depressed and wrinkled. Preanal scale broad, divided by a trans- 

 verse furrow into two heavily striated portions, the basal part strongly 

 depressed at the lateral ends, the distal half noticeably inflated or 

 convex. 



Sternites trapezoidal, with 12 to 16 transverse parallel ridges; 

 stigmata entirely enclosed within the sternites. Legs rather long 

 and slender, the two distal joints visible from above body, all joints 

 smooth and polished, their decreasing order of length: 3, 6, 2, 1, 4, 5. 

 Ventral setal formula: 1, 1,2, 2, 2, 6. 



First two pairs of legs crassate, with long robust claws; legs 3-7 of 

 normal size and shape; third legs with claws of normal size, the others 

 back through the seventh with claws reduced to a tiny vestige, the 

 tarsi of these legs strongly depressed on the dorsal surface. Coxal 

 lobes of third legs erect, slender, and membranous, their tips bent 

 slightly cephalad and then caudad as seen in lateral aspect; lobes of 

 legs 4-7 flat, simple, wedge-shaped, becoming smaller posteriorly. 



Sympleurites of seventh segment broadly in contact at the median 

 line with a distinct suture evident; the anterior edge continumg the 

 curve of the segment, the posterior edge elevated and overhanging. 



Anterior gonopods very similar to those of Eurelus soleatus but 

 differing in the presence of a distinct membranous lobe on the an- 

 terior side of the coxal apex (figure 5,a). Posterior gonopods rather 

 robust and straight, the telopodite ending in two distal lobes as 

 shown in figure 5,6. No trace of a seminal groove can be detected. 



Discussion: Variation: In most structural details this species is 

 quite stable over its considerable range. The gonopods of our male 

 from Keal County, Texas, match perfectly with the illustrations of 

 the type specimen of T. garcianus. 



Combining counts from specimens at hand and published informa- 

 tion, we have nine counts of segment number, ranging from 50 to 53 

 with a mean of 51.4. The standard deviation for this series is 1.33. 

 There is a slight indication that the number increases in going north, 

 but this gradient is probably too slight and gradual to be of much 

 significance. Throughout the area occupied by the two species 

 jointly, there is very little overlap in segment count in C. kerrensis 

 and E. soleatus. 



