224 DESCRIPTIONS OF NEW SPECIES. 



in both sexes, and the 4th joint is more distinctly shorter than the 

 5th. The color varies quite as much as in L. obliterata, though 

 I have never seen a specimen of soror with the anteniedial spot, 

 which is but rarely absent in the former. The prothorax is some- 

 times entirely black, sometimes with the disk and prosternum 

 black, and all the margins yellow ; the head is usually black, 

 with the mouth, and antennal tubercles yellow ; the trunk is some- 

 times entirely black, sometimes black only at the sides ; the legs 

 are testaceous, with the tarsi darker, and in one specimen the 

 hind thighs are dusky at tip. The sexual characters are as in 

 L. obliterata. 



543. L,. plagifera. Nigra, breviter pubescens, prothorace baud dense 

 puuctato, latitudiue vix longiore, antrorsum valde angustato, lateribus 

 ante medium subaugulatis, angulis posticis productis, ante basin trans- 

 versim impresso, et breviter subcanalicula.to ; elytris baud dense subti- 

 lius punctatis, postice dehiscentibus, oblique truncatis et acuminatis, 

 sanguineis, vitta communi lata nigra pone basin ad apicem extensa ; 

 abdomiue sanguineo, tibiis ferrugineis apice fuscis. Long. 13 mm. 



One female. Lake Tahoe, Sierra Nevada; Mr. Edwards. 

 Quite distinct by the characters above given ; to be placed next 

 to L. abdominalis Hald. The thoracic impression is angulated 

 at the middle and extends to the sides ; the pubescence of the 

 prothorax is short and erect, that of the elytra is very short, and 

 at first sight not conspicuous. The genre are long, and the palpi 

 slender as in the other species of the group. 



544. B-. rubida. Nigra, pube snbtili fulva parce vestita, capite 

 tboraceque confertim subtilius punctatis, illo angulis posticis brevibus 

 rotundatis, genis mediocribus; boc latitudine longiore, apice angustiore, 

 lateribus late rotundatis, augulis posticis parvis acutis, basi utrinque 

 late concavo; elytris fusco-testaceis, fortiter baud dense punctatis, fere 

 parallelis, apice oblique subtruncatis vix marginatis; pedibus plus 

 ininusve ferrugineo-fuscis. Long. 13 mm. 



One specimen ; California. The pubescence is very fine, and 

 is grayish beneath, though yellowish above. It is easily distin- 

 guished from the other species of the group by the larger size and 

 different color. The general form is the same as in L. subargen- 

 tata, etc. 



545. I,, tribalteata. Nigra, protborace subtusque dense aureo-pubes- 

 cens ; prothorace campanulato, basi trans versim excavato, angulis pos- 

 ticis acutis ; elytris puuctulatis, dense breviter pubescentibus, Isete flavis, 



