52 BULLETIN BROOKLYN ENTOM. SOC. VOL. VI. September 1883. } 
\ 
T. atrimedius Say, (Feronia) Trans. Am. Philos. Soc. II, 39; similis Kirby (Trechus) 
Faun. Bor. Am. IV, 48. Length 7 mm. Can. to Texas. 
T. nebulosys Lec. Trans. Am. Philos. Soc. X, 385; suturalis Lec. (Acupalpus) Ann. 
Lye. IV, 411. Length 4.5 mm. Ga. to Texas. 
T. badiipennis Hald. (Stenolophus) Proc. Ac. I, 302; Lec. Trans. Am. Philos. Soc. 
X, 385 ; ruficrus Lec. (Geoboeenus) Ann. Lyc. IV, 304 ; lugubris Lec. ibid. p. 305. 
Length 5to6mm. Can. to Kans. and Va. 
T. nitidus De}. (Acupalpus) Spec. IV, 474 ; Mann. Bull, Mosc. 1843. II, p. 214. 
Length 4.5 to6.5 mm. Or., Cal. 
Other details of the species above cited will be found in a paper by. Dr. Leconte 
(Proc. Ac. 1868, p. 379) in'which they are included in Bradycellus, 
ee 
DISCODERUS Lec. 
By Geo. H. Horn, M. D. 
'The species of this genus very closely resemble each other and are extremely difii- 
cult to separate in any tabular arrangement. The following table will assist in their 
recognition, but can not be entirely depended upon with uniques. 
plhovaxmarrowedyabaper see 5312.5 Li cele cs) eae) = Gest! « v,0la spice eee parallelus, 
Thorax with base and apex equal, the sides regularly arcuate. 
Side margin of thorax depressed posteriorly and slightly reflexed........ impotens. 
side margin! mot reflexed? 22-20) 2. san. pier ridin 6.0 sions he Ae ee teneprosus. 
Thorax distinctly narrower at base. ; 
BockylalbovexpiceOus iy ier. etic aia) sire core el RCM 5 onc) «lini toa ee rene gS ee ee robustus- 
Body above bicolored, thorax and head rufo- Pickus the elytra bluish... .amoenus. 
iD parallelus Hald. (Selenophorus) Proc. Ac. I, 301; Lec. Ann. Lyc. IV, 290. 
In this species the thorax is perceptibly narrower at apex than at base. The side 
margin posteriorly is narrowly depressed, and with numerous minute punctures. Color 
piceous without metallic lustre, antenne pale. Length 7 to 7.5 mm. 
Occur most abundantly in Texas and New Mexico, but specimens haye been re- 
ceived from Pa. and Ga, 
D. impotens Lec. Journ. Ac. IV, 1858, p. 14. ?americanus Motsch. Bull. Mosc. 1850, 
Ill, p. 137. pl. 3, fig. 3. 
Beneath rufo-piceous above piceous with slight greenish surface lustre. Thorax 
equally wide at base and apex, with side margin depressed posteriorly and yery slightly 
reflexed. Tength 9mm. Occurs in Texas, Arizona and New Mexico. 
D. tenebrosus Lec. (Selenophorus) Ann. Lyc. IV, 291. 
Piceous, surface without metallic lustre, legs somewhat paler, antennee testaceous. 
Thorax equally wide at base and apex, the side margin not depressed. Length 5:5 mm. 
Occurs in New Mexico and is our elise: species. 
D. robustus n. sp. 
Brownish beneath, piceous or black aboye, legs pale when less mature, antennze 
pale. Form rather robust. Thorax distinctly narrower at base than at apex, the side- 
margin vaguely clepressed. with very few minute punctures and slightly wrinkled along 
