C 33. ■ 



f . -2. 



NOETn AMERICAN COLEOPTERA. 3 



one-half as long as tlie third ; emargiiiation of nientum broadly trapezoidal, 

 tooth rather small, much broader than long, equilatero-triaugularly incised 

 at apex, and broadly excavated on the exposed surface ; longitudinal line 

 between the gular sutures deeply impressed ; mandibles black throughout, 

 tips acute. Prothorax slightly narrower tlian long ; disk rather convex, 

 median line deeply impressed and terminating at short distances from the 

 base and apex ; lateral basal lines broadly and deeply impressed ; apex 

 almost transverse, base very broadly and feebly emarginate ; sides feebly 

 convergent behind, nearly evenly arcuate ; anterior and posterior angles 

 sub-equally and evenly rounded. Scutellum small and acutely triangular. 

 Elytra at base slightly wider than the prothorax, widest at mid-section, 

 nearly two and one-half times as long as the pronotum ; together rather 

 acutely rounded behind; sides evenly and rather strongly arcuate; disk 

 moderately convex, striae deeply impressed, interspaces convex. Legs long 

 and slender. Posterior edges of the ventral segments somewhat paler ; the 

 tip of the last segment is broadly and deeply impressed in the male. Length 

 11.0-12.5 mm. 



The two specimens of this species, a male and a female, which are 

 before me, are from the same lot as the preceding species, and are 

 probably natives of the same region, or the Northern part of Mexico. 



Instead of one posterior supra-orbital seta, which is the condition 

 in the male, the female has, abnormally, three setae very closely 

 approximate, and in the same longitudinal line. The deep, trans- 

 verse, and somewhat rectangular impression at the tip of the last 

 ventral segment in the male is very distinct. 



AIHARA. 



A. apaclieiisis n. sp. — Form rather slender, oval. Head moderate, 

 distinctly broader across the eyes than long ; surface convex and highly 

 polished ; eyes small, very convex, and prominent ; epistoma deeply and 

 transversely impressed just behind the anterior emargiuatiou ; labrum one- 

 half as wide again as long, broadly and feebly emarginate anteriorly, sides 

 nearly straight and moderately convergent ; antennae nearly equal in length 

 to the head and prothorax together, seta of first joint very long and thick ; 

 last joint of maxillary palpi one-half longer than the penultimate, rather 

 slender, acuminate, compressed toward the tip, deeply and longitudinally 

 excavated posteriorly ; mentum tooth strong, broader than long, bifid, incisure 

 in the form of an equilateral triangle, tips rounded, dental setae very long ; a 

 seta in the middle of each end of the sub-mentum is also very well developed. 

 Prothorax three-fourths as wide again as long, apex slightly shorter than 

 the base, and very feebly emarginate ; sides almost evenly and rather feebly 

 arcuate ; disk moderately convex, highly polished, median line distinct, 

 terminating at equal and very short distances from the base and apex ; basal 

 punctures very feeble, coarse, variform, and irregularly distributed in a 

 narrow transverse area along the base ; there are also at the base two 

 rounded impressions on each side of the median line and at equal distances 



