DYNASTIN^E 209 



externally; pygidium shining but not very smooth, extremely mi- 

 nutely, remotely punctulate, with some stronger close punctures 

 toward the ends and, at the middle near the a-pex, having a circular 

 arrangement of the very feeble rugulosity; hind tibiae not very 

 stout, as long as the femora, the tarsi rather stout, much shorter 

 than the tibiae. Length (9) 16.8-18.2 mm.; width 9.5-10.8 mm. 

 Texas (Del Rio), Wickham and El Paso Dunn. Ringgold 

 Barracks LeConte. [Ligyrus ruginasus Lee.] ruginasus Lee. 



Body much more slender, not quite so large, more obscure rufous to cas- 

 taneous in color and not quite so shining; head nearly similar but 

 with the dense rugulose punctuation rather less coarse; prothorax 

 similar in form and in the fine, very sparse punctuation, the sides 

 arcuately , incurving more toward base, becoming feebly subprominent 

 ante-medially and strongly oblique and converging apically; basal 

 angles rounded; scutellum as in ruginasus; elytra more cylindrical, 

 with the punctures of the double series more close-set throughout; 

 pygidium of the female similarly with a feeble apical convexity, 

 finely, feebly and sparsely punctate; tibiae similar; tarsi nearly black. 

 Male stouter than the female, the elytra more evidently wider than 

 the prothorax, the sides of which are rather more evenly arcuate; 

 pygidium more evenly convex, almost similarly and very feebly 

 sculptured. Length (3 9,2 cf ) 16.0-16.8 mm.; width 9.0-9.7 mm. 

 Arizona (southern) pimalis n. p. 



3 Body smaller, rather less convex, more cuneiform, stout, strongly- 

 shining and bright castaneo-rufous; head smaller, blackish, the dense 

 rugulosity coarser but more shallow, the sculpture of the clypeus 

 finer, feebler and much sparser than in any other; clypeus with the 

 apex gradually more strongly reflexed; prothorax as in ruginasus, 

 relatively smaller and with the anterior pit less developed, more 

 shallow, more transverse and less rugose, the tubercle similarly 

 prominent and acute; scutellum similarly finely, sparsely punctate 

 throughout, except at the edges; elytra barely longer than wide, much 

 inflated posteriorly and there fully two-fifths wider than the pro- 

 thorax, circularly rounded in about apical two-fifths; punctures as 

 in ruginasus, the series not so definitely impressed and having the 

 punctures well separated; general punctures very sparse, almost 

 wanting on the central intermediate interval and apical half of the 

 subsutural; pygidium of the male very smooth, evenly convex and 

 very minutely, remotely punctulate, more impressed near the lower 

 oblique margins than in the other species; hind tibiae notably slender 

 and rapidly expanded medially and apically as usual, fully as long 

 as the femora and a little longer than the tarsi. Length (cf 1 ) 14.8 

 mm.; width 8.8 mm. Lower California (San Jose del Cabo). 



peninsularis n. sp. 



In all the species the sterna are densely punctured and conspicu- 

 ously pubescent, the post-coxal prosternal process herissate with 

 long setae throughout as in Ligyrus, and the large post-coxal plate 



is very shining, smooth, finely, sparsely punctate along the base 

 T. L. Casey, Mem. Col. VI, Oct. 1915. 



