THE SHORT-WINGED SCAVENGER BEETLES. 



395 



b. Punctures in dorsal rows of thorax four to six in number, 

 c. Color in great part black or piceous. 



cl. Thorax and elytra black, legs dark reddish-brown. obsidianus. 

 del. Thorax and legs reddish-yellow ; form very slender. 



764. LINEARIS. 



cc. Color mostly pale; head usually black or piceous. 



e. Abdomen wholly pale; punctures of head distinct, coarse and 

 sparse. 



f. Dorsal rows of thoracic punctures extending but little behind 

 the middle : form more robust ; length 5.5-6 mm. 



765. EMMESUS. 



//. Dorsal rows of punctures extending nearly to base ; form very 

 slender ; length 4.5-5 mm. 766. fusctceps. 



ee. Last two segments of abdomen black; punctures of head very 

 minute and indistinct: length 7-7.5 mm. 767. ixdianexsis. 

 hi). Punctures in dorsal rows of thorax 8 to 12 in number. 

 g. Piceous black, thorax not paler. 



7;. Head beneath feebly punctured, above very sparsely and coarsely 

 punctured on the sides ; elytra dark red. 768. gttlaris. 



hh. Head beneath coarsely and deeply punctured; elytra piceous. 

 legs dull brownish-yellow. 769. obscurus. 



gg. Brownish-yellow, head darker; gular sutures deep. 



i. Head very sparsely punctate ; body moderately robust. 



770. HAMATUS. 



ii. Head more closely punctate, especially on sides ; body very slen- 



der. 771. pusillus. 



*763 (2268). Xantholinus cephaixs Say. Trans. Amer. Phil. Soc. IV, 

 1834, 452 ; ibid. II. 567. 

 Elongate, slender. Black, shining : elytra and legs reddish-yellow : an- 

 tenna? and under surface dark reddish-brown to piceous. Head longer than 

 wide, sparsely and coarsely punctured above, more finely punctured and 

 alutaceous beneath. Thorax one-half longer than wide, as wide as head 

 in front, gradually narrowed to base. Elytra as long as and scarcely 

 wider than thorax, coarsely, shallowly and sparsely punctured. Abdomen 

 finely and very sparsely punctate. Length 6.5-7.5 mm. 



Vigo and Posev counties; rare. October 7-December 25. Oc- 

 curs beneath bark and rubbish. 



X. obsidianus Melsh., 6.5 mm. in length, occurs in Pennsylvania 

 and Iowa, and probably inhabits Indiana. 



764 ( ). Xanthountjs linearis sp. nov. 



Linear. Head black, shining: thorax, legs and three basal joints of 

 antenna? reddish-yellow; elytra reddish-brown, the margins and epipleura 

 pale yellow; abdomen piceous. Antenna? stout, but slightly longer than 

 head, pale brown. Head alutaceous. as long as and wider than thorax, 

 coarsely and evenly punctate on sides and base above, sparsely and more 



