316 



FAMILY X.- — PSELAPHIDJE. 



h. Three basal fovese of thorax connected by a curved 

 groove ; elytra each with a deep subhumeral groove. 



XI. Rybaxis. 



hh. Basal fovese of thorax not connected by a grooye; ely- 

 tra without a subhumeral groove. 



i. Elytra with margins and sloping sides nearly parallel ; 



male with three of the dorsal segments sculptured. 



BRACHYGEUTA. 



ii. Elytra with sides diverging ; male with not more than 



two segments sculptured. XII. Bryaxis. 



gg. Elytra each with three small basal fovese; thorax with a 

 large pubescent fovea each side of base and a small 

 round median one. XIII. Reichenbachia. 



ff. Antennae very short, with only the last joint enlarged; ver- 

 tex with two fovese; body glabrous. Eupsenius. 

 cc. Body convex ; margin of abdomen narrow ; thorax with one fovea 

 at base. Anchylarthron. 

 hh. Abdomen not margined ; tarsi with two unequal claws ; thorax with 

 two or three longitudinal grooves; body elongate, more or less 

 cylindrical, narrow. XIV. Batrisodes. 



X. Decarthron Brencl. 1865. (Grr., "ten + joint.") 



Head with disk of vertex longer than wide, the front fovea want- 

 ing; antennse 10-jointed, the joints, aside from those in chib, 

 rounded; thorax subglobose and with a single funnel-shaped fovea 

 near the middle of the base ; eljira broad, each with two basal 

 fovese, the humeri prominent; abdomen short and w T ide, the basal 

 dorsal segment with two distant parallel carinas. One species has 

 been taken in the State, while three others may occur. 



KEY TO INDIANA SPECIES OF DECARTHRON. 



a. Form of body broad, robust. 

 J). Pubescence long, erect. 



c. Color black ; fovese of vertex large and connected with the de- 

 pressed front by faint converging grooves ; length 1.4 mm. 



ABNORME. 



cc. Color dark red ; fovese of vertex small, connected with the convex 

 front by straight parallel grooves ; length 1.6 mm. exsectum. 

 Z>&. Pubescence short ; occipital fovese deep, well separated, not connected 

 with the concave front ; length 1.4 mm. 602. brendeli. 



aw. Form slender, elongate ; thorax not punctate ; color pale reddish-brown ; 

 length 1.5 mm. longulum. 



602 (9373). Decarthron brendeli Casey, Bull. Cal. Acad. Sci., II, 1887, 

 464. 



Piceous-brown ; elytra dull red; antennse and legs paler brown. An- 

 tennse scarcely as long as head and thorax, eighth and ninth joints trans- 

 versely oval, tenth one-half longer than wide and three times as thick as 



