BEMBIDIESLE 43 



middle coast regions of California are specifically different, as can 

 be seen at once by the ample series of adjutor at hand. The pla- 

 niusculum series presents a very different habitus from the plana- 

 tum section, because of the very much smaller size, impunctate 

 stride and polished elytra. More material than the unique type of 

 effetum would be highly desirable, in order to judge of the perman- 

 ence of the very remarkable elytral striation, in which it differs 

 radically from any other species of the second section. Otherwise 

 it very closely resembles flebile, excepting that the antennae are 

 perceptibly longer and the prothorax more evenly rounded on the 

 sides anteriorly. 



The two species forming the third section are among the more 

 isolated of the entire genus, because of their relatively slender and 

 subequally wide anterior parts, long neck and long and very slender 

 antennae and legs. The species described by Dr. Blaisdell, from 

 Mendocino Co., under the namefalstim (Pr. Acad. Nat. Sci., Phila., 

 1902, p. 76), undoubtedly belongs to this section, but differs from 

 electum in its broader prothorax when compared with the elytra, 

 this proportion being nearly as in extensum, but it differs from ex- 

 tensum in its shorter elytra, these being two-thirds longer than wide 

 as in electum. The author, however, makes no allusion to a notably 

 long neck in falsum. 



Group VII bifasciatum 

 Subgenus Liocosmius nov. 



In this very limited group the species are small, elongate, moder- 

 ately convex and highly polished throughout, having a subcordi- 

 form to obtrapezoidal prothorax and very smooth elytra, with 

 striation only visible toward the suture and sometimes wholly ob- 

 solete, except the sutural stria toward the apex. The striae are 

 generally wholly impunctate, but in one rather aberrant species are 

 very finely punctured as in the erasum section. The elytra always 

 have each two clearly defined pale spots, which assume various 

 forms in the different species. 



The five species in my collection may be known as follows: 



Prothorax obtrapezoidal; elytra each with three subsutural striae, which 

 are finely but distinctly punctured. Body black, polished, each 

 elytron broadly testaceous laterally in basal third, the pale area 



