182 Trans. Acad. Sci. of St. Louis. 
2— Body as in remotus but somewhat more slender, similar in coloration 
and sculpture, the head not distinctly wider than the prothorax, with 
the parallel sides slightly arcuate and the basal angles more broadly 
rounded; prothorax fully as long as wide, strongly obtrapezoidal with 
the angles distinct; elytra and abdomen as in remotus but still narrower. 
Length 2.7 mm.; width 0.4mm, California (San Francisco to Sta. Cruz.). 
cuneicollis Csy. 
Body as in cuneicollis in coloration and sculpture but still more slender, the 
head slightly wider than the prothorax with the sides parallel and 
broadly, feebly arcuate, the basal angles scarcely rounded; prothorax as 
long as wide, strongly obtrapezoidal, the sides broadly arcuate; elytra 
equal to the prothorax in width and length, fully as long as wide, the 
sides diverging as usual, the basal angles rounded; abdomen as wide as 
the elytra, and, as usual, half as long as the body. Length 2.5 mm.; 
width 0.38mm. California (Mokelumne Hill, Calaveras Co.),—Dr. 
Blaisdell... s <csich sis ccccednntan cveececcdesh over eredeoussssseMiGi Dy 80. 
Body as in the preceding species but a little stouter than jfilum, pale rufo- 
testaceous with the legs and antennae concolorous, the abdomen 
piceous; surface more polished, with the punctures a little sparser and 
more feeble; head slightly wider than the prothorax, parallel and feebly 
arcuate at the sides, the basal angles distinctly rounded; prothorax 
very nearly as long as wide, only moderately obtrapezoidal, the angles 
slightly rounded; elytra rather flattened, not quite as long as wide oras 
long as the prothorax but as wide as the latter, the sides almost paral- 
lel but broadly arcuate. Length 2.6 mm.; width0.4mm. Montana 
(western), — Mr. Wickham.......ceeceee cece ceevece sees fl@Xilis 2. SD. 
The male sexual characters are constant throughout the 
genus, as in Caloderma, and consist solely of a triangular 
notch, with its angle somewhat blunt or narrowly rounded and 
situated at the apex of the sixth ventral segment. The notch 
is smaller than in Caloderma, relatively deeper and more 
triangular. 
Caloderma Csy. 
Although widely separated in some characters, such as the 
dilated anterior tarsi of the male and absence of labral denti- 
tion, there can be no question that Pseudomedon is the near- 
est relative of Caloderma. The general form of the body, 
and, more particularly, the small head, are the same in both 
genera, but the gular sutures are much more widely separated 
in the former. Thespecies of Caloderma are numerous, con- 
fined entirely to the regions west of the crest of the Rocky 
Mountains and are difficult to separate in some cases, which 
is also the condition in Pseudomedon,—a smaller but very 
