CALIFORNIA ACADEMY OF SCIENCES. 299 



P. nigriceps n - sp. — Form slender; sides parallel; pale yellowish-testa- 

 ceous, head and sometimes the apex of the pronotum dark piceous, elytra 

 paler and whiter; clouded portions of the abdomen seneous in lustre; ante- 

 rior portions strongly alutaceous; abdomen shining, coarsely and evenly 

 asperate, the asperities having a tendency to form transverse rows, especially 

 toward the apices. Head slightly wider than long; eyes elongate, oval; front 

 feebly convex, feebly and sparsely punctate. Prothorax slightly wider and 

 much longer than the head, widest very slightly in advance of the middle, 

 where it is about one-fifth wider than long; sides evenly and rather strongly 

 arcuate; apical angles slightly obtuse, not at all rounded, basal rather broadly 

 rounded; base about four-fifths as wide as the apex, very broadly arcuate' 

 the latter very broadly emarginate; disk feebly convex. Elytra at base 

 slightly wider than the base of the pronotum; sides rather strongly diver- 

 gent posteriorly, moderately arcuate; disk depressed, about one-half wider 

 than long, as wide at the apices as the pronotum, nearly three-fourths as 

 long as the latter; exterior apical angles prolonged and acute, inner angles 

 slightly rounded; each elytron very narrowly margined along the suture. Scu- 

 tellum very small, triangular. Abdomen nearly twice as long as the head, 

 prothorax and elytr.i together, as wide as the latter; sides parallel; fifth 

 dorsal very broadly sinuate at tip, sixth truncate. Legs and antennae pale 

 tastaceous, slender. Anterior coxa3 large, elongate. Length, 3. 3-3. S mm. 



California (Santa Cruz, 11). 



The three species here described agree very closely in 

 general form, but the characters given in the table will 

 serve to distinguish them without trouble. The inflexed 

 sides of the pronotum terminate at about one-fourth the 

 length from the anterior angles. 



TACHYUSA Erichs. 



The following species are placed in this genus, although 

 the anterior tarsi are apparently five-jointed, the fourth joint 

 being small but not anchylosed. They differ from Phlceo- 

 pora, Colodera, etc., in facies, and especially in the tarsal 

 and antennal structure; the first four joints of the hind 

 tarsi decreasing almost uniformly and very rapidly in length, 

 the first being generally shorter than the next two united; 

 the antennas are very slender. The middle coxaa are very 

 narrowly separated. 

 9 



