PROC. ENT. SOC. WASH., VOL. 20, NO. .-5, MAY, 1918 111 



vated, nearly four times as long as the very short, sparsely punctate pos- 

 terior lobe; anterior angles rounded and extended to hind margins of eyes; 

 posterior margin lightly and broadly arcuated. Scutellum a little wider 

 than long, obsoletely punctate. Claval suture obsolete, clavus connate 

 with the corium. Hemielytra very finely punctate, abbreviated, mem- 

 brane wanting; posterior margin sinuate; lightly oblique, outer apical 

 angle reaching to third abdominal suture. Connexivum elevated, pale. 

 Sides of abdomen posteriorly furnished with three or four long slender 

 setae, nearly as long as one-half the diameter of abdomen. Very much 

 swollen anterior femora appear to be unarmed, the fore legs in the single 

 specimen being folded in such a way as to obscure the under side of the 

 femorae. 



Length of 9 , 2 mm. 



Described from a single brachypterous d 71 , Santa Cruz Mts., 

 Calif., A. Koebele collector. (Type U. S. N. M.). This is a 

 smaller and paler species than the two preceding, with a very short 

 corium and lacking the membrane. The long setae on the sides 

 of the abdomen posteriorly are very striking. 





 Plinthisus pallidus n. sp. (Ms. name of Uhler.) 



Shining, ochraceous, with fine, pale appressed hairs. Head impunctate, 

 a little wider than long, sunk to the eyes, in the rather strongly concave 

 anterior margin of the pronotmn. Antennae finely pilose with the last 

 three segments castaneus; basal segment a little exceeding apex of head, 

 second segment twice as long, third a little shorter than second, fourth sub- 

 equal to third. Pronotum transverse, faintly punctate in front; lateral 

 1 margins gradually widening anteriorly, then for a short distance abruptly 

 convexed to the rounded angles back of eyes; lateral edge very narrowly 

 keeled, not sinuate between the lobes; anterior lobe not elevated, about 

 four times as long as the posterior lobe; posterior margin gently arcuated. 

 Scutellum wider than long, finely punctate. Clavus not differentiated, 

 entirely connate with the corium. Hemielytra finely and closely punctate ; 

 abbreviated; membrane absent; apical margin, not sinuate, lightly ob- 

 lique, outer apical angle reaching third abdominal suture. Dorsal part of 

 abdomen a little darker, finely punctate; connexivum elevated; a few long 

 setae posteriorly. Incrassate fore femora apparently unarmed. 

 Length a 71 1.5 mm. 



Described from two cf's, Los Angeles, Calif., from the collection 

 of P. R. Uhler, one of which is labeled with the Ms. name. Plin- 

 th MI* pnllf.fl us Uhl. (Type U. S. N. M.). 



This is the smallest and palest member of the genus thus far 

 known from the United States. It is most closely related to P. 

 longisetosus but the pronotum is widened in front and the apical 

 margin of the corium is straight. The posterior setae are not so 

 evident. 



