346 [June, 



coaT&eiy punctured ; tlie elytra are blackish towards the apex. The spurs of 

 the posterior tibiae are as in the last species. 



One of the California specimens has the abdomen entirely black. 



4. N. pall en s, pallide fiava, antennis tarsisque nigris, thorace transverso, 

 parce punctato, lateribus antice rotundatis, elytris minus dense subtilius punc- 

 tatis breviter liavo-pubescentibus. Long.- '36. 



One specimen from Valiecitas, in the southern part of California. This spe- 

 cies is sufficiently distinct by the diagnosis given. I will merely add that the 

 head is slightly luscous ; the apex of the mandibles and palpi is black; the first 

 joint of the antenna?' is yellow, the rest are black, the 2d is one half the length 

 of the third : the spurs of the' posterior tibioeare as in the two preceding. 



5. N. lut ea, luteo-testacea', thorace transverso, lateribus antke rotundatis, 

 parce punctatOj elytris confertira punctatis flavo pubescentibus ; subtus plus 

 minusve infuscata, antennis tarsisque nigris. Long. -4 5-. 



Missouri Territory, common. Ht-ad triangular, moderately punctured, sparsely 

 pubescent with yellow hair ; mandibles, palpi and maxillcE black ; antenna? black, 

 2d joint two-thirds as long as the third. Thorax transverse, rounded on the 

 sides anteriorly;' disc polished, very sparsely punctured. Scutellum sometimes 

 dusky. Elytra densely somewhat rugosely punctured, pubescent with short 

 yellow hair. Body beneath fuscous, anterior and middle Thighs, and tip of the 

 abdomen yellow ; tarsi black; posterior tibioe with the outer spur less thick 

 than in the preceding species ; inner spur nearly as long as the outer one, slender, 

 flattened, rounded at tip. 



A. c*. 



6. N. dichroa, supra luteo-testacea, thorace transverso, lateribus antice 

 rotundatis, parce punctato,- elytris minus snbtiliter sat dense punctatis, scutello 

 antennis corpore subtus, pedibusque nigris, ano luteo. Long. -38. 



One specimen from Oregon, Col. M'CalL The pubescence has been entirely 

 removed by alcohol. This species very much resembles the preceding, but the 

 punctuation of the elytra is coarser, and ihe legs are entirely black. It forms, 

 with the next species, a transition between the two groups ; the outer spur of 

 the posterior tibiae, though cylindrical and obliquely truncate, is very little 

 thicker than the inner spur. 



7. N. dubia, nigra, nigro-pubescens, thorace modice transverso, antice vix 

 angustato et lateribus rotunciato, parce punctato, elytris rugose punctatis. 

 Long. '4. 



Variat thorace capiteque la?te fulvis. Long. '35. 



Benicia,two specimens. This species closely resembles the preceding, but 

 the color is very different, the elytra are more finely punctured, and distinctly 

 rugous. The specimen having red head and thorax, may eventually prove to be 

 a distinct species; thethorax is not narrowed anteriorly in it, and therefore ap- 

 pears more quadrate. The outer spur of the posterior tibiae is slender, cylin- 

 drical, and truncate obliquely.. 



8. N. pall i at a, nigra, nigro-villosa, supra fulvo-testacea, thorace transverso, 

 sat dense punctato, antice subangustato-, lateribua^ rectis, elytris subtilius punc- 

 tatis, vitta utrinque lata scutelloque nigris. Long. "5. 



One specimen from the upper Mississippi. In the form of the thorax this 

 species resembles of the preceding only N. b i c o 1 o r ; the apex is, however, 

 more oblique each side. Body and all the appendages black: above reddish 

 testaceous, with short black hair: head triangular, not elongated, tolerably 

 densely punctured ; thorax one half wider than long, slightly narrowed anteriorly, 

 sides not rounded ; apex oblique each side, so' that the anterior angles although 

 obtuse and rounded, are distinct : disc moderately punctured, slightly channeled 

 behind the middle. Scutellum black, pu)ictured. Elytra finely punctured, with 

 a broad discoidal black vitta reaching from nrar the base to the apex. Antenna? 

 with the 2d joint three fourths the length of the 3d; posterior tibiae with the 

 outer spur flat, a little broader than the inner one, and obtuse. 



