THE GROUND BEETLES. 



159 



nn. 



II. Hind angles of thorax prominent ; humeri distinct. 



7i. Elytra oblong, scarcely widened behind ; abdomen wholly pale ; 

 size small, not over 7 mm. 291. janthinipennis. 



Elytra gradually but distinctly dilated behind ; abdomen dark, 



at least on sides, 

 o. Narrow lateral edge and epipleura of elytra pale yellow; 

 knees, sides of abdomen and metathorax dusky. 



292. LATERALIS. 



Lateral edge and epipleura of the same color as the elytra ; 

 front angles of thorax obtusely rounded; very small, not 



oo. 



over o.o mm. 



293. 



MEDIUS. 



Fig. 87. X It 

 (Original.) 



278 (973). Brachynus alternans Dej., Sp. i, 1825, 316. 



Elytra bluish-black ; abdomen fuscous. Thorax at mid- 

 dle about as wide as long, front margin slightly concave, 

 the angles obtuse but distinct, hind angles rectangular. 

 Elytra distinctly costate, the intervals between the ridges 

 finely and sparsely punctate. Length 14-15 mm. (Fig. 

 87.) 



Southern half of State ; frequent. April 6- 

 July 4. 



*279 (975). Brachynus tormentarius Lee, Ann. Lyc. 

 Nat. Hist., IV, 1848, 200. 

 Thorax as wide as long, front angles obtuse but distinct; hind angles 

 rectangular, not prominent. Elytra costate, the humeri distinct, broadly 

 rounded. Length 14-15 mm. 



Vigo and Posey conn tics ; scarce. Hibernates. January 1- 

 April 19. Very close to aMernans and probably only a variety of 

 that species. 



280 ( 974). Brachynus deyrollei Laf., Rev. Zool., 1841, 42. 



Antennae reddish-yellow, the apical portion darker ; abdomen piceous. 

 Thorax distinctly longer than wide, slightly narrower than the head ; front 

 margin concave, the angles obtuse, hind angles distinct but not prominent. 

 Elytra subcostate, the humeri rounded but evident. Length 14-15 mm. 



Knox County ; rare. July 4. 



281 (962). Brachynus americanus Lee, Proc. Phil. 

 Acad. Nat. Sci., II, 1844, 48. 

 Elytra black, but faintly tinged with blue; four basal 

 joints of antennae pale, the remainder gradually dusky ; 

 abdomen almost black. Thorax wider than long, the 

 base gradually constricted, hind angles rectangular. Ely- 

 tra distinctly but not strongly costate; intervals wide 

 and finely punctured; humeri very much sloping, not at 

 all distinct. Length 10-11.5 mm. (Fig. 88.) 



Vio-o, Knox, Crawford and Perry counties ; fre- 



f ig. 88. X 2. 



(Original.) quent. April 23-October 21. 

 [11—23402] 



