220 Trans. Acad. Sci. of St. Louis. 



flfth wider than the latter in the female, the male larger as a rule and 

 gtouter throughout; mesosternal process somewhat narrower than usual 

 but not acute. Length 2.3-3.0 mm.; width 0.68-0.7 mm. Arizona 



(Tucson and Riverside pimalls n. sp. 



8 — Form only moderately stout, blackish-piceous in color, the prothorax 

 slightly paler, the antennae lufuscate distally; punctures very minute 

 and sparse throughout; head orbicular, convex, as long as wide, the 

 sides strongly arcuate and converging behind the eyes, with a very 

 small rounded impression at the middle of the vertex in the male which 

 becomes much larger and deeper in the female; antennae extending to 

 the middle of the elytra, distinctly incrassate distally, the twosubapical 

 joints slightly shorter than wide; prothorax not quite as wide as the 

 head in either sex, scarcely visibly wider than long, the skies rounded 

 anteriorly, thence rather distinctly converging and feebly sinuate to the 

 base, the surface convex, wholly unimpressed except the distinct 

 blfoveate transverse impression before the scuteiiura in the male, 

 somewhat deeply impressed along the median line from apical two- 

 fifths to the transverse impression in the female; elytra two- thirds 

 wider and a third longer than the prothorax; abdomen similar in the 

 sexes, parallel, distinctly narrower than the elytra; basal joint of the 

 hind tarsi rather longer than the next two combined. Length 2.6 mm. ; 

 width 0.65 mm. California (Los Angeles Co.) citrlnan. sp. 



A single specimen of lucens Bernh., was very kindly given 

 me by Dr. Fenyes. The species is very readily distinguishable 

 by the unusually large and more close-set punctures of the 

 head, this also being a distinctive character in majuscula ; 

 the mesosternal process of the latter is more acute at tip than 

 in any other species that I have observed but is approached in 

 this respect to some extent by pimalis, which is a common 

 form, widely distributed over the more arid parts of Arizona. 

 The abdomen in pimalis appears to be notably narrower in 

 the female than in the male, and the same peculiarity may 

 affect mollis^ which is now represented in my cabinet by a 

 single female having a notably narrow abdomen, but I have 

 not observed this rather remarkable character elsewhere in the 

 genus and it is certainly not true of laticollis^ although there, 

 as generally in the genus, the male is a trifle stouter than the 

 female. This seems to occur frequently in the Staphlinidae 

 and may be a general rule. 



MeroDcra Shp. 

 This genus resembles the preceding somewhat in outline 



