AMERICAN COLEOPTERA. 245 



The last joint of the maxillary is smaller, and the third joint stouter 

 and more turbinate than in the other species of this group. 



Group I, — B. 



5. T. litlioeliariiius, n. sp. — Very depressed, brownish -black, nearly 

 opake, very finely punctulate and pubescent. Head as wide as the prothorax, 

 eyes small, not prominent, posterior constriction sudden, hind angles rounded. 

 Maxillary palpi with the third joint turbinate, truncate at tip, fourth joint 

 slender, acicular, distinct. Antenna extending to half the length of the elytra, 

 not stout, fifth and following joints rounded, distant, gradually a little larger. 

 Prothorax wider than long, sides strongly rounded in front, oblique near the 

 base, where it is narrower, truncate before and behind, angles rounded. Elytra 

 a little wider than the prothorax, and more than twice as long. Legs dark- 

 brown, tarsi testaceous. Length 3 mm; .12 inch. 



Puget Sound, Mr. Gr. Davidson. The punctuation is so fine as to 



be almost imperceptible; there are very vague traces of impressions 



on the prothorax, but hardly worth mentioning. The epipleural line 



of the elytra is very fine. 



» 



Group II. 



6. T. laticollis, Haploderus | lat. Lee. New Spec. Col. 55. 



One specimen, S. Carolina, Dr. Zimmermann. Differs remarkably 

 by the broader form, which resembles that of OxijUlus. The pro- 

 thorax is very finely punctulate, the elytra rather strongly punctured. 

 Length 2.5 mm; .10 inch. 



Group III. 



7. T. arcifer, n. sp. — Depressed, strongly punctured, more finely upon the 

 dorsal segments, sparsely finely pul)escent, legs yellow, base of antennae piceous. 

 Head moderately narrowed immediately behind the eyes, which are not very 

 prominent; frontal impressions deep, antennal tubercles large. Antennae a 

 little longer than head and prothorax, much thicker externally. Prothorax 

 nearly twice as wide as long, emarginate in front, much rounded on the sides 

 and base, front angles not rounded; disc with a large deep curved im2)ression 

 near the base; dorsal line not apparent. Elytra wider than the prothorax and 

 one-half longer. Tip of abdomen and under surface piceous, strongly and finely 

 punctured. Maxillary palpi with the third joini elongate-ovate, fourth small, 

 acicular, distinct. Length 2.8 mm; .11 inch. 



■J,. — Seventh ventral segment emarginate behind; eighth with a small nar- 

 row apical fissure. 



Middle, Western and Southern States. The epipleural line of 

 the elytra is fine, but distinct, and in the usual position, far from 

 the margin. 



TRANS. AMEU. EKT. SOC. VI. (33) OCTOBER 1877. 



