1873.] 543 [Horn. 
S. texanum, n. sp. 
Cylindrical, moderately robust, piceous, shining, thorax and elytra at 
base rufous. Head densely punctured, vertex with two minute tubercles 
between the eyes. Thorax slightly wider than long, anteriorly acutely 
asperato-granulate, posteriorly moderately densely and finely punctured. 
Elytra coarsely punctured and with two intervals moderately distinct, 
slightly sub-carinate at base and at tip terminating in the two upper tuber- 
cles, tip rather suddenly declivous and punctured on each side, acutely 
trituberculate, the lower tubercle more prominent. Antenne and femora 
pale, tibize piceous. Length .14 inch ; 3.5 mm. 
This species greatly resembles seatuberculatum but is usually a little 
larger and the declivity has a few coarse punctures. The head of the male 
has two dentiform tubercles on the vertex, while there are four in the other 
species. 
Occurs in South-western Texas. 
S. sextuberculatum Lec. Proc. Acad. 1858, p. 73. 
In color and sculpture this species agrees for the most part with the pre- 
ceding. There are not, however, the sub-costiform intervals, and the de- 
clivity of the elytra is smooth and without punctures, on each side acutely 
trituberculate. Length .14-.16 inch ; 3.5-4 mm. 
The male has four minute tubercles on the vertex arranged in an arcu- 
ate line between the posterior margins of the eyes. The head of the female 
is plain. 
Occurs in California, near Fort Yuma, and probably depredates on the 
Mesquit. 
S. quadrispinosum Lec. New Species, 1866, p. 100. 
Resembles the preceding in formand color. The thorax in front is acutely 
tuberculate, posteriorly very sparsely and finely punctured, The elytral 
punctures are finer at base gradually coarser posteriorly, the declivity is 
smooth and on each side two equal, conical tubercles. The legs and an- 
tenne are pale, the front tibize alone piceous. Length .16 inch; 4 mm. 
Occurs in Lower California and Arizona. 
S. dinoderoides, n. sp. 
Rufo-piceous, feebly shining, cylindrical. Head densely punctured. 
Thorax as broad as long, asperato-granulate in front, posteriorly moder- 
ately densely punctured. Elytra moderately densely but not coarsely 
punctured, declivity convex, not margined nor tuberculate, suture elevated. 
Body beneath moderately densely punctulate. Length .16 inch ; 4 mm. 
This species has entirely the form of its congeners excepting the absence 
of margin to the declivity. It is however one of those cases in which it is 
rather difficult to decide the generic position. The intermediate joints of 
the antenne 3-7 are short and scarcely as long as the first two, and the 
club (joints 8-10) is rather closer than that of any of the others. With these 
differences noted, I place it in the present genus rather than in Amphicerus 
where its specific name appears in the Check List. 
Two specimens ; Camp Grant, Arizona. 
