THE GROUND BEETLES. 



179 



f. Mentum not toothed; elytra frequently with several dorsal punc- 

 tures; length less than 3.5 mm. LXX. Acupaipus. 

 ff. Mentum toothed; elytra with a single dorsal puncture; lengtli 

 4.5-5.5 mm. LXXI. Beadycellus. 

 aa. Antenna? with three basal joints glabrous; mentum toothed; middle 

 tarsi of males with two rows of small scales beneath; length 5.5- 

 7 mm. L/XXII. Tachycellus. 



LXVI. Gynandropus Dej. 1825. (Gr., "of doubtful sex + feet. ") 



Small oblong black beetles having the first joint of front tarsi 

 of males almost as long as the next two. One species occurs in In- 

 diana. 



329 (1074). Gynandropus hylacis Say. Trans. Amer. Phil. Soc, II, 1823, 

 31 ; ibid. II, 459. 



Elongate, rather slender, parallel. Black, strongly shining ; antennae and 

 legs pale, the former dusky toward apex. Thorax convex, as long as wide, 

 narrower at base than elytra, widest at middle, sides broadly curved ; basal 

 depressions distinct, coarsely punctured ; hind angles obtuse. Elytral striae 

 moderately deep, the second, fifth and seventh each with a number of fine 

 dorsal punctures. Length 7.5 mm. 



Starke, Marion, Putnam. Jackson and Dubois counties; scarce. 

 March 31 November 23. Occurs beneath bark. 



LXVII. Harpalcs Lat. 1802. (Gr., "greedy ") 



Large or medium-sized beetles, usually oblong in form and 

 rather flat, having the thorax nearly square ; elytral striae not punc- 

 tured ; first joint of hind tarsi never longer than the next two. The 

 males have the first four joints of the front and middle tarsi di- 

 lated, the dilated joints scaly beneath. They occur beneath logs 

 and rubbish, most commonly about the margin of cultivated fields, 

 and for the most part are considered beneficial, though the largest 

 and one of the most common. H. caliginosiis, is a seed eater and it is 

 claimed feeds largely upon clover and grass seeds. In 19 specimens 

 dissected by Dr. Forbes, only about 12 per cent, of the food was of 

 animal origin, principally caterpillars and ants, while seeds and 

 other tissues of grasses made up 14 per cent. The only paper treat- 

 ing of the genus is by 



LeConte. — "Notes on the Species of Harpalus Inhabiting Amer- 

 ica North of Mexico," in Proc. Phil. Acad. Nat Sci., 1865, 

 98-104. 



The genus is a large one, about 50 species being known from the 

 United States. Of these 17 have been taken in Indiana, while eight 

 others perhaps occur. For convenience the Indiana species may 

 be divided into two groups : 



