230 [January, 



long, while in reality the troehatiter is meant. The bibliography of our species 

 is as follows : 



C. pulsator Plald. Proc. Acad. Nat. Sc. 3, 348. Chorf.a pulsator Hald. 

 ibid. 3, 150. 



For the typical female I am indebted to the liberality of Mr. Ilaldeman j and 

 for a fine male, found in Ohio, to Dr. Schaum. 



Chal'liog.nathus lleiltz. 



1. C. discus, luteus, antennis pedibus pectorecjue medio nigris, thorace 

 elliptico loiigiusculo, lateribus reHexis. Long. -ti. 



Several specimens, from the Mexican Boundary, Prof. Baird ; collected by 

 Mr. Clark, under Col. J. D. Graham. Body elongate, parallel, very finely 

 pubescent, luteous yellow ; antennae black, 3d joint nearly equal to the 4th; 

 head elongate, palpi and mandibles black ; occiput sometimes fuscous ; thorax 

 nearly twice as wide as the head, longer than wide, apex very niuch rounded, 

 slightly reflexed, base less rounded, mar:iined, sides strongly rellexed, disc 

 scarcely uneven, shining, sometimes with a black spot on the little protuberance 

 each side of the middle ; elytra opaque, coarsely punctured with two faint ele- 

 vated lines ; sometimes each is marked with a black dot at the posterior third. 

 Beneath luteous, middle of the pectus and feet black ; trochanters testaceous ; 

 anal segment of the male fuscous. 



2. C.scutellaris, elongatus, niger, thorace luteo maculis 2 nigris conflu- 

 entibus notato, apice rotundato, lateribus reflexo, elytris luteis macula com- 

 muni scutellari posticaque utrinque nigtis, abdomine luteo. Long. -48. 



Several males from the same locality as the preceding. Body slender, black, 

 finely pubescent ; head moderately elongated, third joint of the antennae one 

 half as long as the 4th; thorax a little longer than wide, rounded at the apex, 

 rellxed at the sides, margined and slightly sinuate at base, disc uneven, with- 

 out lustre, yellow, with two large confiuent black spots. Elytra without lustre, 

 coarsely punctured, yellow, with a large common triangular spot at the base, 

 and another elongate one on each behind the middle, black. Abdomen yellow. 



CoLLOPS Erichson. 



C. balteatus, niger, breviter nigro-pilosellus, brevissime argenteo pu- 

 bescens, capite antice, thoracis subtiliter punctulati limbo loto, antennarumque 

 basi rufis, elytris punctatissimis rufis basi maculaque postica maxima cyaneis. 

 Long. '31 



Two specimens from Tampico (Mexico), Lieut. H. Ilaldeman ; and one from 

 the Mexican Boundary, collected by Mr. Clark. This is the largest species I 

 have seen. Head black, front mouth and base of antennas rufous. Thorax very 

 finely punctured, one half wider than long, rounded, rufous, with a large hexa- 

 gonal black spot, which is a little emarginate before and behind. Elytra wider 

 than the thorax, very densely punctured, rufous with four blue spots, which are 

 so large that only a narrow sutural lateral and apical margin and a transverse 

 band before the middle remain reddish yellow. Beneath black, with the ante- 

 pectus, and margins of the abdominal segments testaceous. Feet black; knees 

 obsoletely rufous. 



The outer joints of the antennae of the male are dark colored, though not 

 black as in the female. 



Clerus Geoff r. 



C. Spinolnc, niger, pilosus, elytris convexiusculis, rugose punctulatis, coc- 

 cineis macula humerali fasciaque ad trientem secundum nigris, abdomine san- 

 guineo. Long 'ZS 52. 



Several specimens from the Mexican Boundary. Body black, hairy. Head 

 finely but not densely punctured, first joint of antennae red beneath. Thorax 

 wider than the head, punctulate, moderately convex, broadly and deeply im- 

 pressed anteriorly. Elytra more than one half wider than the head, moderately 

 convex, densely rugosely punctulate, pubescent with fine yellow hairs, with a 



