CALIFORXIA ACADEMY OF SCIENCES. 29 



coarsely, xevy feebly aud somewhat sparsely punctate; median line broad; 

 epistoma moderately produced, In-oadly and feebly arcuate at apex; anteunal 

 tuberculations feeble, not prominent; antennae nearly as long as the he.id 

 and prothorax together, second joint slightly shorter than the third and much 

 longer than the fourth, not very robust, third three times as long as wide. 

 Prothorax just perceptibly narrower than the head, very slightly longer than 

 wide; sides parallel, nearly straight in the middle; base and apex broadly, 

 nearly evenly and rather strongly arcuate, the latter very slightly the more 

 strongly so; nuchal emargination much more than one- third as wide as the 

 disk, broadly and very feebly incurvate; anterior and posterior angles broadly 

 and nearly equally rounded; disk broadlj^ and rather feebly convex, rather 

 coarsely, sparsely and excessively feebly punctate in the middle, the punc- 

 tures becoming tiner, more distinct and denser toward the sides; median im- 

 XDunctate area rather broad. Elytra at base distinctly wider than the protho- 

 rax, slightly wider than the head; sides parallel, feebly and nearly evenly- 

 arcuate; together broadly, roundly and moderately sinuate behind; disk one- 

 fourth longer than wide and one-third longer thstn the pronotum, rather 

 coarsely, densely, evenly and sub-asperately punctate. Abdomen at base dis- 

 tinctly narrower than the elytra; sides i)arallel and nearly straight; surface 

 very minutely, feebly, densely aud sub-asperately punctate; border ^rather 

 narrow and deep, slightly paler in color. Legs slender; first joint of the pos- 

 terior tarsi one-half longer than the second, sub-equal in length to the fifth. 

 Length 4.0 mm. 



Sonoma Co., 1 S . 



Eesembles the preceding two species in its elongate pro- 

 thorax, but possessing a still different modification of the 

 male sexual characters. The fifth segment is broadly emar- 

 ginate nearly throughout its width at apex, the sides of the 

 emargination being feebly convergent and nearly straight, 

 each having aporrected fringe of seven rather widely-spaced 

 spinules; the median process is very short and broad, being 

 twice as wide as either of the fimbriate sides adjoining; it is 

 broadly, feebly and evenly arcuate throughout its width at 

 apex, and without any appearance of lateral teeth ; sixth seg- 

 ment strongly and parabolically emarginate at apex, the 

 notch being nearly one-half wider than deep. 



METAXYOLONTA n. gen. 



In this genus, represented by two closely-allied spe- 

 cies, the form and general appearance again differ most 



