TRIBE III. HYPERIXI. 



bia, west to Iowa and Missouri. Keoorded as occurring on the 

 mild smartweed, Poli/f/oiiiini hydropiperoides Michx., and also on 

 arrow-head. The oblique humeri, deeper emarginate base and 

 more robust form separates this from the preceding. 



201 (8447). LISTROXOTUS ROTUXDICOLLIS Lee., 1876, 132. 



Blackish, covered with dirty brown scales, those of sides of thorax 

 paler. Beak feehly carinate, lateral grooves almost obsolete, frontal fovea 

 distinct. Thorax as wide as long, sides strongly rounded, disc densely 

 and coarsely punctured. Elytra with deep punctured strife; intervals con- 

 vex, their setse rather conspicuous. Last ventral of female with a large 

 shallow rounded impression, the elytra conjointly rounded at tip. Length 

 7.5 mm. 



The above is LeConte's description of the type female from 

 Georgia. Another is in the Horn collection from Louisiana. Not 

 recorded elsewhere. 



202 (8446) LISTROXOTUS AMERICANS Lee., 1876, 131. 



Blackish, covered with round, dirty brown scales, which are larger 

 on thorax, less dense and hair-like upon the head and beak; thorax with 

 two sinuous lateral vittse and a narrow dorsal line of paler scales; sides of 

 elytra also pale. Beak as long as thorax, strongly carinate and sulcate. 

 Thorax scarcely as long as wide, rounded on the sides, narrowed before 

 the middle, coarsely and densely punctate. Elytra strongly emarginate 

 at base, humeri oblique, sides parallel, compressed at the suture near tip 

 and vertically declivous; posterior callus distinct, not prominent. Female 

 with last ventral deeply concave, narrowly and deeply emarginate at tip 

 and with two excavations on apical edge each side of the emargination; 

 tips of elytra separately rounded. Length 14 mm. 



Described by LeCoute from three females taken in Georgia 

 and without other records. The large size and the peculiar sculp- 

 ture of the last ventral, should make it easily recognizable. Two 

 of the types are at Cambridge, the other at Philadelphia. 



GROUP II. 



The species of this group average much smaller, some of them 

 being but little if any larger than the largest Hi/pcrodcs. The 

 secondary sexual characters are also feebly developed, the female 

 elytra being rarely prolonged at tips and last ventral in most 

 species scarcely or not at all impressed. 



KEY TO SPECIES OF GROUP II. 



a. Head clothed with hair-like scales; beak slightly flattened above, usu- 

 ally more or less carinate and sulcate. 

 I). Thorax distinctly longer than wide (except in female of frontalis). 



