THE CYLINDRICAL BARK BEETLES. 



551 



ce. Head with distinct grooves, II. Euciconks. 



bb. Antennae 11- jointed, club 2-jointed. 



d. Head without antennal grooves. III. Ditoma. 



del. Head with distinct antennal grooves; tibiae with terminal spurs. 



EUDESMA. 



aa. Front coxal cavities closed behind. 



d. Antenna 1 with a two-jointed club; tibiae without spurs. 



IV. Coxelus. 



ee. Antenna' with a .".-jointed club; tibia? with small spurs. 



Lasconotus. 



I. Synchita Hellw. 1792. (Or., ' ' together + skin or cover. ") 



Antenna? 10-jointed, terminating in an abruptly larger club 

 joint, which is smooth at base and pubescent at tip; first three 

 joints of tarsi very short, together bat little longer than half the 

 fourth. Of the seven known species, two have been taken in Indi- 

 ana,, while two others should occur. 



KEY TO INDIANA SPECIES OF SYNCHITA. 



a. Elytra with tine eosta' ; thorax with an elevated line each side. 



LATICOLLTS. 



aa. Elytra not costate. 



b. Elytra variegated with paler markings. 1053. parvula. 



bb. Elytra unicolorous. 



c. Thorax with a fine subapical impressed line, its disk finely granu- 

 late; length 2.5 mm. fuliginosa. 

 cc. Thorax without impressed line, its disk coarsely granulate; length 

 4 mm. 1054. granulata. 



8. laUcollis lee., piceous, elytra with humeri and a spot near 

 apex reddish, length 2 mm., is a southern form which has been 

 recorded from Cincinnati. 



1053 (3247). Synchita parvula Guer., Icon. Regn. Ins., 1S30, 189. 

 Oblong, subdepressed. Piceous brown; elytra variegated with paler 



crossbars. Thorax wider than long, sides feebly curved, margin finely ser- 

 rulate, base slightly wider than apex, surface granulate. Elytra with rows 

 of rather small, close-set punctures ; intervals granulate. Length 2-2.5 mm. 



Marion County ; rare. December 8. Taken from dry fungi on 

 a dead beech tree. 



S. fuliginosa Melsh., rusty red-brown, antenme, under surface 

 and legs paler, is also known from near Cincinnati. 



1054 (3249). Synchita granulata Say, Journ. Phil. Acad. Nat. Sci., V. 



1826, 266 ; ibid. II, 326. 

 Oblong, parallel, moderately convex. Uniform dull reddish-brown, sub- 

 opaque. Third joint of antennae as long as the three following together. 

 Thorax wider than long, sides feebly curved, margin distinctly serrate, base 



