182 Trans. Acad. Sci. of St. Louis. 



2 — Body as in i-emotus but somewhat more slender, similar iu coloration 

 auil 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 nari'ower. 

 Length 2.7 mm. ; width 0.4 mm. California (San Francisco to Sta. Cruz.) . 



cnueicollis 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 0.38 mm. California (Mokelumne Hill, Calaveras Co.), — Dr. 

 Blaisdell lilnm n. sp. 



Body as in the preceding species but a little stouter t\i&nfilum, 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 or as 

 long as the prothorax but as wide as the latter, the sides almost paral- 

 lel but broadly arcuate. Length 2.5 mm.; width 0.4 mm. Montana 

 (western), — Mr. Wickham flexilis n. sp. 



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. The species of Caloderma are numerous, con- 

 fined entirely to the regions west of the crest of the Rocky 

 Mountains and are difiicult to separate in some cases, which 

 is also the condition vn Pseudomedon, — a smaller but very 



