ROLAND HAYWARD. 197 



Elytra with the first dorsal puncture on the fourth interval, the second en- 

 closed within the recurved portion of the sutural stria. 



Group ix. proximus. 



Group I. senescens. 



Head rather small, inserted in the thorax to the eyes (PI. VI, 

 fig. 9); mentum without forameniform punctures; antennae with 

 the second and third joints subequal. Thorax narrowly margined, 

 the margin not translucent. Elytra subtruncate at tip, with one 

 very small dorsal puncture situated close to the apex and appar- 

 ently on or near the third stria ; sutural stria not recurved at apex ; 

 marginal stria interrupted at middle. 



The anterior tarsi are similar in the sexes. 



In this group the single dorsal puncture of the elytra is extremely 

 small, so minute, in fact, that it can be located only by the seta 

 arising from it. It is therefore impossible to determine with cer- 

 tainty its actual position, whether close to or on the third stria. 



Judging from our only representative it seems to stand alone 

 more than any other group. It was placed by LeConte in Biennis, 

 a genus since suppressed. By other authors it has been referred to 

 Lywnastis Motsch. 



1. T. senesceiis Lee. (Plate VI, fig. 1). — Form moderately elongate, de- 

 pressed. Color brownish-piceous. sometimes rufous, shining, the head usually 

 darker, the elytra sometimes with slight iridescent lustre. Head narrower than 

 the thorax at apex; frontal grooves short; eyes moderate, slightly prominent ; 

 antenna? scarcely one-half as long as the body, fuscous, the basal joints paler; 

 palpi testaceous. Prothorax scarcely one-half wider than long, as wide at base 

 as apex; apex truncate; anterior transverse impression obsolete, the posterior 

 rather feeble and close to the base; meidan line deep, abbreviated at each end ; 

 hasnl impressions distinct; base truncate, obliquely so each side; sides slightly 

 rounded in front, oblique behind ; hind angles obtuse, but not rounded, not cari- 

 nate. Elytra slightly wider than the thorax, subparallel, nearly oblong, striate; 

 stria? distinct, impunctate, subentire, the inner ones scarcely deeper, the fifth 

 slightly grooved towards the apex ; intervals nearly flat. Body beneath brown- 

 ish-piceous. Legs pale yellowish-testaceous. Length .07 .09 inch ; 1.75-2.25 mm. 



A very aberrant species with no apparent affinities, and easily 

 recognizable from all the others in our fauna. 



It is known to me only from North Carolina, Florida, Arkansas 

 and Louisiana. 



Group II. nanus. 



Head not inserted in the thorax to the eyes ; mentum without 

 forameniform punctures; antennae with the third joint distinctly 

 longer than the second. Thorax with the side margin narrowly 



TRANS. AM. ENT. SOC. XXVI. JANUARY, 1900. 



