and species of (lie Family Pselaphidse. 35 



DECARTHRON, Brendel. 

 Maxillary palpi, last joint fusiform. Antennae 10-jointcd. 



a. Thorax with one basal groove and nearly entire dorsal striae on 

 the first abdominal segment. 



D. abnorme. Brendel. (Bryan's abnorme, "Lee.) Head with two discal grooves and 

 abroad excavation in front. % , intermediate thighs very little 

 emarginate above. A dark long pubescence. Long 1.65 m. m. 

 Hab. — Northern States. 



D. exsectum, Brendel. Head with very small discal grooves and a small ex- 

 cavation in front. % , intermediate thighs with a strong acute 

 spine above. A long pubescence. Long 1.7 m. m. Hab. — East- 

 ern States. 



D. stigmosum, Brendel. Head flat, with four small punctures. ^ , interme- 

 diate thighs narrow and deeply emarginate above near the 

 knee-joint. Pubescence short. Long 1.72 m. m. Hab. — Penn. 



D. longulum, Brendel. (Jjryaxis longula, Lee.) Head with two ample, variolate, 

 distinct grooves, an excavation in the front. %, intermediate 

 thigh narrowly and acutely emarginate. Thorax not punc- 

 tured. Long 1.5 m. in. Hab. — Pennsylvania. 



D. formiceti, Brendel. {Bryaxis formiceti, Lee.) Head with two distinct grooves 

 and an excavation on the front. Thorax punctulate. % , in- 

 termediate thighs with a strong spine above near the middle. 

 Long 1.2 m. m. Hab. — Southern States. 



D. strenuum, Brendel. Head plain, punctured. Thorax punctured. Pubescence 

 very dense and long. ^ unknown. Long2.0m.m. Hab. — Penn. 



b. Thorax with a basal transverse sulcus, groove wanting. 



D. cornutum, Brendel. Head nearly plain in $> (?). uneven and horned in % . 



Thighs plain. Long 2.0 m. in. Hub. — Mississippi Valley. 



EUPSENIUS. LeConte. 

 Maxillary palpi, last joint acute-ovate. Antennas short, joint trans- 

 verse, the last very large. Pubescence wanting. 



E. glaber, Lee. Thorax three-grooved, with a basal sulcus. Long 1.1 m. m. 



Hab. — Southern States. 

 E. rufus. Lee. Thorax three-grooved, sulcus wanting. Long 1.4 m. m. Hub. — 

 Southern States. 



II. — Abdomen not margined, tarsi with two unequal claws. 



ARTHMIUS. LeConte. 



Thorax not sculptured. Body convex. 



A. globicollis, Lee. Head with two grooves, thorax globular smooth, elytra with- 



out dorsal striae. % .fifth antennal joint large, globose; the an- 

 terior tibiae armed with a spine near the middle. Long 1.6 m. m. 

 BATRISUS, Aube. 

 Thorax sculptured, l>ody elongate. 

 I. — Posterior tibise unarmed. 



a. Front concave. Vertex rounded, not carinate. 



B. Ionae, Lee. Head behind produced in a very high rounded tumor. %, in- 



termediate trochanters armed with an acute sj)ine. Long 2.66. 



