382 FAMILY ST. STAPH YLINIDJE. 



finely but not densely punctured, sparsely clothed with yellowish hairs. 

 Abdomen slightly narrower than elytra, more finely and densely punctate. 

 Male with last ventral acutely and deeply notched. Length 4.5-5.5 mm. 



Throughout the State; frequent. April 8- August 15. Occurs 

 on fungi and beneath dead leaves and logs. The abdominal seg- 

 ments have their apical margins ahvays paler. 



Geoup B. 



In this group the front tarsi are dilated and there are four 

 punctures in each of the dorsal row.s of thorax. The males are 

 readily separated by the notch of the last ventral segment. 



KET TO INDIANA SPECIES OF GROUP B. 



a. Front tarsi of males very broadly dilated, sometimes plate-like. 



6. Thorax oval, distinctly narrowed in front; elytra black or piceous, 

 coarsely not closely punctured ; length 6.5-8 mm. 732. umbbinus. 

 7)6. Thorax quadrangular, very little narrowed in front. 



c. Elytra clear red, very sparsely and rather finely punctate. 



733. PALLIATUS. 



cc. Elytra black or piceous, at least moderately punctate. 



d. Black; last ventral of male with a rather deep, lengthwise Im- 

 pression extending nearly to its base. 734. quadricoixis. 

 dd. Brownish or piceous; last ventral of male without a lengthwise 

 impression ; legs and basal joints of antennse pale. 



735. DEBILIS. 



((((. Front tarsi of males moderately dilated, sometimes very little wider 

 than in the female. 

 e. Larger, 5-7.5 mm. ; antennse slender, the outer joints longer than 

 wide. 



f. Elytra rather densely punctured; abdomen very distinctly punc- 



tured, vabians. 



ff. Elytra sparsely punctured, slightly bronzed; abdomen very indis- 

 tinctly punctured. 736. lonqicobnis. 

 ee. Smaller, not over 5 mm. ; antennte slender, outer joints quadrate. 



g. Thorax as wide as long; hindmost dorsal puncture distant from 



the third. discoidehs. 



gg. Thorax longer than wide; punctures equidistant. THEEMARUst, 



732 (2169). Philonthus xjmbrinus Grav., Mon. Col. Mlcr., 1806, 169. 



Moderately elongate, rather robust. Body black, strongly shining ; legs 

 piceous or dull brownish-yellow. Antennse reaching middle of thorax, joints 

 4t-10 gradually shorter and wider than long. Head subquadrate, front with 

 two pairs of punctures above each eye; hind angles sparsely punctate. 

 Thorax convex, slightly longer than wide, the hindmost puncture somewhat 

 distant from the third. Elytra slightly wider than thorax, sparsely clothed 

 with brownish hairs. Abdomen iridescent, sparsely and rather coarsely 

 punctate. Last ventral segment of male deeply notched, the margins of 

 the notch gi'ooved. Length 6.5-8 mm. 



Vigo County ; rare, July 1, Taken from decaying fleshy fungi. 



