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



sternum, venter and last two segments of the antennae darker castaneus; 

 posterior lobe of the pronotum, hemielytra anteriorly and laterally, first 

 two segments of the antennae, rostrum and legs ochraceous. 



Head, a little wider than long, impunctate, sunk to the eyes, in the arcu- 

 ate anterior margin of the pronotum. Antennae pilose, the basal segment 

 exceeding the tylus by nearly one-half of its length, second segment not 

 quite twice as long as first and one-third longer than third, the latter a little 

 shorter than fourth. First segment of rostrum shorter than second which 

 is considerably longer than third. Pronotum almost quadrate; anterior 

 margin gently arcuate, punctate within; the anterior angle on each side 

 being obtuse and extended to just beyond posterior margins of the eyes; 

 lateral edge strongly keeled, lightly sinuate between the two lobes; the 

 anterior impunctate lobe a little wider, swollen and twice as long as the 

 coarsely punctate, depressed posterior lobe; posterior margin broadly 

 arcuated. Scutellurn about equilateral, impunctate but finely rugulose. 

 Clavus wide, not deflected to the corium. with about thre'e irregular series 

 of punctures. Corium sparsely punctate. . Membrane very short and ob- 

 lique, reaching about to middle of fifth abdominal segment. Anterior 

 femora much swollen, armed with a single stout tooth and two preapical 

 teeth. Anterior tibia of male strongly curved and expanded apically. 

 Several long setose hairs posteriorly on the abdomen. 



Length, <? 3-3. 5 mm. 



Described from brachypt. cf Assinniboine, Montana, August 

 2, 1892. (Type U. S. N. M.) and brachypt, & Bear Pw. Mt., 

 Montana August 26. (Paratype U. S. N. M.). 



This is about the color, size and general appearance of the pre- 

 ceding species but the head is sunk to the eyes, the pronotum is 

 relatively longer, the anterior lobe being more swollen and the 

 scuttellurn impunctate. 



I have adopted the Ms. name found attached to the type 

 specimen from the collection of P. R. Uhler. 



Plinthisus longisetosus n. sp. 



Subshining; sparsely pilose on head and antennae. Head, disk of 

 anterior lobe of pronotum pale castaneus; scutellum, dorsal part of abdo- 

 men except connexivum, antennae except at base, darker castaneus. Basal 

 segment and basal part of second segment of antennae, rostrum, anterior 

 margin and posterior lobe of the pronotum, hemielytra, connexivum, legs 

 and ventral parts, ochraceous. 



Head triangular, a little wider than long, impunctate, sparsely pilose in 

 front, sunk to the eyes in the lightly arcuated anterior margin of the pro- 

 notum. Antennae pilose; basal segment about one-half the length of the 

 second, third one-fourth shorter than the second, fourth segment missing. 

 Pronotum transverse, parallel sided, scarcely sinuate between the two 

 lobes; lateral edge narrowly carinate; impunctate anterior lobe not ele- 



