THE POWDER-POST BEETLES. 



889 



1687 (5350). Bosteichus bicobnis Web., Obs. Ent., 1801, 

 Elongate, subcylin&rical. Piceous, subopaque, clothed 

 with yellowish scales arranged in irregular patches. Tho- 

 rax prolonged in front in two booked processes which are 

 serrate, the apex between them truncate; apical region 

 roughly granulate, basal half with smaller granules, me- 

 dian line distinctly impressed. Elytra bicostate, the in- 

 ner costa stronger; surface densely and coarsely punc- 

 tured and clothed with yellowish scales in patches; tips 

 in male with an acute subsutural spine. Length 7- 

 12 mm. (Fig. 350.) 



Throughout the State; frequent. June 4-Sep- 

 tember 20. Occurs beneath bark and in old fungi. 



91. 



Fig. 350. (After Pack- 

 ard in Fifth Rep. U. S. 

 Ent. Comm.) 



1688 (5351). Bosteichus akmiger Lee, New Spec. N. Am. Col., 1866, 100. 



Form of Ucorms, which it closely resembles. Elytra with trace of 

 inner costa at base ; intervals tuberculate, especially near the suture ; sur- 

 face clothed with longer hair-like scales arranged in patches. Length 7.5- 

 9 mm. 



Lake County; rare. July 21. Taken by Dury at Cincinnati. 

 Probably throughout the State. 



16S9 (5352). Bosteichus teuncaticollis Lee, New Spec. N. Am. Col., I, 

 1866, 101. 



Elongate, subcylindrical. Piceous, subopaque. Thorax slightly longer 

 than wide, apex seen from above, truncate, without processes; otherwise 

 as in bicornis. Elytra without costse or tubercles, surface densely and 

 coarsely punctured and clothed with patches of yellowish appressed hairs. 

 Length 7.5-10 mm. 



Wells, Marion and Putnam counties ; scarce. June 4-July 5. 

 Occurs beneath bark, especially that of sycamore. 



IV. Amphicertjs Lec. 1861. (Gr., ' 1 on both sides + horn. ") 



This genus differs from Bostrichus by having the front of head 

 not margined; joints of antennal club strongly compressed and 

 deeply bistriate from the apical margin; hind angles of thorax 

 rounded. One of the seven species occurs in Indiana. 



1690 (5356). Amphicebus bicaudatus Say, Journ. Phil. Acad. Nat. Sci., 

 III, 1823, 320; ibid. II, 180. 

 Cylindrical, moderately elongate. Piceous-brown, sparsely clothed with 

 recumbent pubescence. Thorax as long as wide, strongly sloping before and 

 behind, the front portion with many small tubercles and with two larger 

 hook-like processes; the basal half granulate. Elytra rather coarsely and 

 irregularly punctured, strongly sloping on apical fourth, the declivity 

 oblique, coarsely punctured, with moderately long processes each side in 

 male. Length 6.5-9 mm. 



