2 34 Natural History Bulletin. 



Head, includincr eyes, slifrhtly longer than wide, eyes large, 

 distant about their own length from the base and from the 

 constriction behind the frontal tubercles which are small, 

 longer than broad, and divided by a fine sharply defined line. 

 Vertex convex; between the eyes are situated two large 

 pubescent foveae mutually a little more distant than they are 

 from the eves. Antennce one-half the length of the body, 

 joints at base and tip oblique, parallel, the first cylindrical, 

 equal in length to the width of the frontal tubercles taken 

 together, second smallest, rounded, transverse. Joints three 

 to ten nearly equal, very little broader than long, eleventh 

 cylindrical tapering for the last third to a point, and about as 

 long as the two preceding. Prothorax about equal in width 

 at the middle to the length of the head and two-thirds as long. 

 Sides evenly rounded in the middle and straight toward the 

 neck and base. The latter is one-third wider than the neck 

 and sHghtly narrower than the disk in the middle. Lateral 

 foveas small, circular, one-third the length from the base, mid- 

 dle one oblong, shallow. Elytra, across the rounded, not very 

 prominent humeri, one-fifth wider than the prothorax, suture 

 twice as long as the prothorax and one-eighth shorter than 

 the greatest width of the elytra. Basal fovese deep sutural 

 fines converging on the posterior half, discal fines divergent, 

 obsolete near the tip. Abdomen broadly margined, sides uni- 

 formly arcuate, edges of each segment slighth- so, each seg- 

 ment uniformly vaulted from side to side, the first shorter 

 than the second. Legs long slender, tarsi one-third the 

 length of the tibiae, claws equal, small. Sexual differences 

 unknown. 



Habitat. Middle California. 



Ctenistes Reichenb. ( Kr? i-iffr//,— a hair dresser.) 



Ct. pulvereus, Lee. Piceous brown, pubescence scaly, 

 gray. Length 2.3 mm. Plate VI., Fig. 16. 



Head (including eyes) longer than wide, frontal tubercles 



