270 NATURAL History BULLETIN. — - 
Ferruginous, abdominal carine divergent, springing from a tri- 
angular pubescent pad. ¢ last ventral with a deep, sharply 
defined, small, oval fovea. Length, 1.8mm. Missouri. 
trigona, 294 
(Unknown to us). 
Reddish-piceous or brown, head and prothorax brighter red, elytra 
piceous-black, pronotum polished, obsoletely punctured with sae 
distant, ample, shallow punctures; lateral fovew small, | 
median very conspicuous. Abdominal carine feebly diverg- ff . 
ent. Length, 1.1mm. Iowa. - - ZW he bicolor. 294 
18 Pubescent pad linear, as long as one-third or more of the segmental 
width. 
51 Pronotum punctured. 
Head and pronotum evenly but not densely punctured, punctures 
varying in strength, especially in females. Lateral pronotal 
fovee large, in full view from above; abdominal carinze 
short, not perceptibly divergent, sometimes covered by the 
elytra in the ¢. Color, dark piceous or paler, elytra red or 
darker, legs and antenne red. Length, 1.0-1.2mm. Region 
east of the Missouri and Mississippi rivers. - puncticollis. 295 
Head smooth, pronotum polished, with scattered, irregularly dis- 
tributed, faint punctures. Lateral fovez plainly visible from 
above. Color invariably a uniform dull orange, or ferru- 
ginous. Abdominal carine moderately long. Length, 1.2 
mm. Lowlands from Texas to Pennsylvania, not occurring 
in the Mississippi valley. - - - - litoralis. 296 
Head and pronotum scarcely perceptibly punctulate, pronotal 
lateral foveee impressed on the sides and not fully visible 
from above. Color black, elytra, legs, antenne and palpi 
dull red, not polished. Length, 1.3mm, Nevada. 
nevadensis. 296 
52 Pronotum decidedly impunctate. 
Form slender with narrow shoulders, elytra short, abdomen long, 
convex, highly polished, pubescence thin; abdominal carinz 
including two-fifths of the total width, divergent. No sexual 
marks on the antenne. ¢ with the last two ventrals impres- 
sed at base. Color dark grayish brown or piceous. Length, 
1.2mm. New York. : - - -  polita. 297 
E. Abdominal carine separated by more than one-third of the segmental 
width. Antenne different in the sexes, 
11 Frontal fovee larger than or equal to the interocular fovee. 
21 Dark brownish red or milky coffee colored; legs commonly paler, some- 
times darker. 
Frontal fovea very large, ¢ antenne with the fourth joint widely 
dilated, fifth to eighth small, closely united, transverse, ninth 
and tenth nearly as wide as the last. Length 1.2 mm. 
Southern California. - : - - - - sagax, — 
