710 FAMILY SXXVII. ELATERTD^E. 



Crawford County; rare. June 5. Taken from decaying beech 

 log. Known heretofore only from Ohio. 



Sarpedon scabrosus Bonv., black, apical margin 

 of thorax reddish, length 6.5 mm., is known from 

 Canada, Tennessee and Nebraska, (Fig. 275.) 



IX. NEMATODES Latr. 1825. (Gr., "thread-like.") 



Elongate, cylindrical species, having the anten- 

 na? filiform; mandibles rather broad and coarsely 

 punctured; prosternal sutures straight; hind coxal 

 plates widely dilated on inner side ; fourth joint of 

 rig. 275. Sarpedon scab- tarsi excavate-emarginate and slightly lobed be- 



rosus Bonv. (After Horn.) 



neatn. 



KEY TO INDIANA SPECIES OF NEMATODES. 



a. Joints 4, 5 and 6 of antennae distinctly longer than wide, and very little 

 shorter than the following joints. 1341. ATROPOS. 



aa. Joints 4 and 5 small, not longer than wide, 7 to 11 equal, rather ab- 

 ruptly longer. 



1). Sixth joint of antennae not longer than fifth, distinctly shorter than 



the seventh ; size smaller, not over 6 mm. 1342. PENETRANS. 



&&. Sixth joint of antennae as long as seventh, distinctly longer than 



fifth ; size 8 or more mm. 1343. COLLARIS. 



1341 (4058). NEMATODES ATROPOS Say, Trans. Amer. Phil. Soc., VI, 1836, 



1ST; ibid. II, 626. 



Elongate, subcylindrieal. Dark brown, almost black, subopaque; an- 

 tennae and legs reddish-brown. Antennae slightly less than half the length 

 of body, second joint longer than fourth, third nearly equal to the next 

 two, 4 to 11 gradually longer, each longer than wide. Thorax distinctly 

 longer than wide, widest one-third from apex, hind angles acute; disk 

 slightly flattened at middle, median line impressed nearly to apex, a more 

 or less distinct fovea on each side; surface densely and rugosely punctate. 

 Elytra gradually narrowed from base to apex, surface striate; intervals 

 flat, densely but less coarsely punctate than thorax. Length 6.5-9 mm. 



Wells County; scarce. Collected by E. B. Williamson. July 1. 

 Described from Posey County. 



1342 (4059). NEMATODES PENETRANS Lee., Proc. Phil. Acad. Nat. Sci., VI, 



1852, 47. 



Elongate, subcylindrieal, slender. Dark brown or piceous, feebly shin- 

 ing; antenme and legs reddish-brown. Antenna- less than half the length 

 of body, second joint longer than fourth, third as long as the next two, four, 

 five and six, short; seven to eleven each as long as third. Thorax dis- 

 tinctly longer than wide, sides at apical third narrowing to the front, basal 

 two-thirds straight and parallel; disk with a distinct median impression 



