Juneigoo.] CASEY : On NORTH AMERICAN COLEOPTERA. 69 



Very small, the elytra more rapidly narrowed from the base, piceous-brown in color, 

 the pubescence rather less coarse ; metasternum distinctly punctured, especially 

 toward the sides. Length 0.7 mm.; width 0.55 mm. California (Sonoma Co. ). 



debilis, sp. nov. 



When discovered, individuals are rather abundant. Sericoderus is 

 said in the " Biologia " to have the antennae n -jointed, but these 

 organs are quite evidently io-jointed in our species, and the details 

 given by Mr. Matthews for the antennas of 6*. latus show that it should 

 properly form a genus distinct from Sericoderus. 



Parmulini. 



The numerous species of this tribe can be recognized at once by the 

 oblong or oval and less convex pubescent body, more or less widely 

 subexplanate at the lateral and apical limb of the pronotum, and the 

 rectangular thoracic angles. The genus Sacium of LeConte, is said 

 by Heyden, Reitter and Weise to be the same as Parmulus of Gund- 

 lach, but, as the LeContean Sacium is composite, I am in doubt as to 

 which if any is the true Parmulus and have therefore not adopted the 

 name for any one of our genera ; it is, however, retained for the tribal 

 designation. The three genera before me may be identified by the 

 following characters : — 



Antennae 1 1 -jointed ; presternum well developed in front of the coxae, the posterior 

 margin of the buccal opening deflexed at the middle, forming a broad inferiorly 

 vertical liguliform process 2 



Antennae io-jointed ; presternum extremely short in front of the coxae, the buccal 

 margin not at all deflexed 3 



2 — Body elongate and subparallel ; antennae more elongate, the club relatively longer, 

 looser and more serriform, the fifth and seventh joints both enlarged ; basal joint 

 of the hind tarsi shorter, scarcely as long as the next two combined, the basal 

 joints thicker Sacium 



Body oval, with more arcuate sides ; antennae shorter, with a more slender shaft and 

 stouter and more compact club, the seventh joint enlarged, the fifth normal ; hind 

 tarsi with the basal joint elongate and more slender, always much longer than the 

 next two combined Molamba 



3 — Body oval or oblong-oval, rather more convex but nearly as in Mola?nba ; an- 

 tennae moderately elongate, the club loose and well developed, the elongate third 

 joint followed by four small subequal joints ; posterior tarsi slender, with the 

 basal joint elongate, the anterior more or less dilated at base ; species generally 

 minute Arthrolips 



The epipleurae are horizontal, moderately wide, narrowing gradually 

 and disappearing behind the middle, the first ventral segment very 

 long, equaling the next three or four combined. 



