and species of the Family Pselaphidse. 37 



b. Front, the elevated margin wanting, not sulcate, plain and 

 punctured. 

 B. bistriatus, Lee. Head plain, densely punctured, bifoveate behind. Thorax 



bilineate. Elytra punctate. Long 2.1 m. m. JHa6.— Penn. 

 B. lineaticollis, Aube. Head plain, densely punctured, bifoveate, Thorax 

 tri-lineate. Elytra not punctured. Long 2.5 m. rn. Hah. — 

 Eastern States. 



REMARKS OX SEXUAL CHARACTERS. 

 The sexual characters of the species Batrisus under I, are expressed 

 by the armature of the legs, and the tooth at the base of the last anten- 

 nal joint, which joint is longer than in 9 • For those species under II, 

 there is one character truly sexual, and that is the frontal margin, pro- 

 duced and overhanging the face in the % , while the 9 has a single 

 straight bar between the insertion of the antennae. The last abdominal 

 segment in most of them is more or less pointed in tho 9 • The tooth 

 on the last antenual joint is masculine in those species that are pro- 

 vided with it. But the penultimate large joint in B. globosus, nigricans 

 and spretus may be considered masculine, though the want of it is not 

 always feminine. 



EUPLECTIXI. 

 This section is divided as follows : — 

 A. — Tarsi with but one claw. 



* Antennae straight Trimium. Euplectus. 



** Antennae geniculate Rhexius. 



B. — Tarsi with two equal elaws Faronus. 



A. — Tarsi irith one claw. 

 TRIMIUM. Aube". 

 The second ventral segment longest. 

 T. globifer, Lee. Lateral thoracical grooves connected by an arcuate sulcus. 

 Occiput not impressed. Long 1.5 m. m. Hah.— Southern States. 

 T. dubium, Lee. Thoracical sulcus nearly straight. Occiput entire. Head with 

 a semi-circular sulcus connecting four small foveolse and a 

 small groove in the middle of the vertex. Long O.S m. m. 

 Hah. — Southern States. 

 T. parvulum, Lee. Thoracical sulcus nearly straight. Head without a central 



impression. Hah. — Southern states. 

 T. impunctatum. Brendel. Thoracical sulcus angulate. Occiput entire. Head 

 with two oblong Longitudinal grooves, connected by an angu- 

 lated sulcus. Long 1.3 m. m. Hah. — Xorthern States. 



EUPLECTUS. 

 The ventral segments equal. 



* Body eonr X. 



E. canaliculatas. Loe. Thorax, two Lateral grooves connected by a semi-circu- 

 lar sulcus, and an entire longitudinal sulcus. Long 1.0 m. ni. 

 Hob. — Northern States. 



