KOUrn AMERICAN COLEOPTERA. 79 



the sides cveuate in frout. Aulcrior tibite tridcntate externally, the teeth not 

 large, above obsoletely crcnate. Posterior femur sparsely punctate, the posterior 

 marginal line entire, the tibia without accessory spinule, the first tarsal joint a 

 little longer than the long spur. Length .14 inch ; 3.5 mm. 



Closely allied in form and sculpture to Lecontei, and in a less de- 

 gree to cylindrm, but difiers, espeeially, from either by the form of 

 the clypeus. It is also related to vexator Har., a species from the 

 West Indies and Brazil, which is, however, larger and with different 

 elytral sculpture. 



Occurs from Pennsylvania to Ijouisiana. 



A. gracilis Mels. — Form slender, elongate, parallel, subdei)ressed, jticeous 

 black, legs piceous or brownish, tarsi paler, moderately shining. Antenna^ and 

 palpi rufotestaceous. Head moderately convex, closely punctate, the middle of 

 front and anterior portion of clypeus smoother, the punctures across the occiput 

 coarser. Clypeus slightly impressed in front, at middle broadly, but feebly emar- 

 ginate, on each side broadly rounded, the sides arcuate, genaj moderately jiromi- 

 nent. Thorax one and a half times wider than long, apparently a little narrower 

 posteriorly, sides moderately arcuate, hind angles broadly rounded, base arcuate, 

 the marginal line very distinct, disc moderately convex, a distinct depression in 

 the front angles, a feebler one at middle of declivity, median line posteriorly 

 obsoletely inapressed, punctures moderately coarse and rather close, somewhat 

 denser at the sides, a little finer toward the front, but somewhat closer. Elytra 

 as wide as the thorax, humeri slightly dentate, sides parallel, strise deep and 

 broad, not distinctly punctured, the intervals convex, almost eariniform, with a 

 series of catenuliform elevations on each side below the summit, those on the 

 inner side more distinct. Mesosteruum opaque, coarsely punctured, strongly 

 carinate between the coxse. Metasternuni coarsely sparsely punctate. Abdomen 

 similarly punctured, the last segment smoother, the segments crenate in front. 

 Anterior tibiae tridentate externally, not crenate above. Posterior femur sparsely 

 punctate, the posterior marginal line entire, the tibia without accessory spinule. 

 the first tarsal joint longer than the long spur. Length .12-.lf) inch ; ,3-1 mm. 



A small species of slender parallel form, and feeble surface lustre, 

 widely distributed over our territory, exhibiting very little variation, 

 except slightly in the sculpture of the thorax. The carination of the 

 prosternum in front of the cox?e is more acute than usual, and the 

 ])0.«t-coxal laminiform elevation better marked. 



Occurs from Massachusetts (Blanchard) to Arizona and California, 

 and has been, like ahditus, found in Mexico, South America and the 

 West India Islands. 



A. flgnrator Harold.— Elongate, parallel, feebly convex, piceous black, 

 shining; legs piceo-rufous. tarsi ]>aler. Anteunse rufotestaceous. Head moder- 

 ately convex, coarsely punctured across the occiput. si)arsely finely i)unctured at 

 middle, coarsely i)unctured rugose and somewhat wrinkled at the sides. Clyiu'us 

 im])resscd in front, broadly feebly emargiiiate, on each side with l)roadly rounded 



