THE LONG-HORNED WOOD-BORING BEETLES. 



loll 



1875 (5958). Orthosoma brunnetjm Forst, Nov. 

 Spec. Ins.. 1771, 37. 

 Elongate, parallel. Uniform light chestnut- 

 brown, shining. Head with a deep impression be- 

 tween the antennse. Thorax more than twice as 

 wide as long, each side with three sharp teeth. 

 Elytra each with three hue raised lines, surface 

 finely and rather thickly punctured. Fifth ventral 

 segment rounded in female, broadly truncate in 

 male, leaving the sixth visible. Length 22—10 mm. 

 (Fig. 423.) 



Throughout the State ; frequent. June 29- 

 August 14, Often enters honses to which it is 

 attracted by light. The larvae are supposed to Fig m . Natural size, 

 live only in pine, but evidently feed on oak (After Riley.) 



and walnut trees in Central Indiana, where pine are absent, 



II. Prionus Geoff. 1764. (Gr., "a saw.") ~ 



Very large, broad forms having the antennal joints conical, 

 stout and overlapping in male; more slender and subserrate in fe- 

 male; the surface of the fourth and following joints covered with 

 fine, reticulate, elevated lines bearing special sense organs ; thorax 

 armed each side with two or three sharp teeth; elytra broadly 

 rounded at apex, punctate and ornamented with raised lines. Three 

 of the six recognized species occur in the State. 



KEY TO IXDIAXA SPECIES OF PRIOXUS. 



a. Antennal joints 12 ; soles of hind tarsi densely pubescent. 



b. Elytra at base not wider than thorax; all 

 joints of hind tarsi densely pubescent 

 beneath. 1ST6. laticollis. 



bb. Elytra at base wider than thorax; basal 

 joint of hind tarsi nearly smooth. 



1ST7. POCTJLARIS. 

 aa. Antennal joints 16-20; soles of hind tarsi 

 with scattered hairs. 1S7S. imbricornis. 



1S76 (5959). Prionus laticollis Drury. 111. 



Nat. Hist.. II. 1773, S3. 

 Broad, stout. Piceous black, shining. An- 

 tenna^ of male longer than body : of female about 

 one-half the length. Thorax almost or quite as 

 Fig. 424. Female. Natural si ze . ^vond as the base of elytra, sides with three 

 (After LeBaron.) teeth, the hindmost one often indistinct; these 



sometimes slightly reflexed. Elytra broader at base than apex; each with 

 three slightly elevated lines: surface roughly, coarsely and very irregu- 



