SYNOPSIS OF THE LAMIIX.B. 165 



densely pubescent antennae, feeble elvtral sculpture, form of the 

 sutural spines, and smooth, polished and impunctatc hyi)omera. 



Tetropium. — Three species have recently been added to the pre- 

 vious two by Capt. Thomas L. Casey, and a synoptic table of all the 

 species presented, which is here reproduced from Ann. N. Y. Acad. 

 Sci. vi, 22. 



Elytra wider than the prothorax ; tliiid anteniial joint in the male much longer 

 than the second. 

 Third antennal joint (female) pyriforni, unusually short, scarcely twice as long 

 as wide ; pronotum very spai-sely punctate, except laterally ; elytra gen- 

 erally pale ciiiiiainopterum. 



Third antennal joint (female) much more elongate, always distinctly more 

 than twice as long as wide ; pronotum very densely punctate. 

 Pronotum with a narrow and abruptly limited median impunctatc area 

 toward biise, which is subcarinate ; elytra generally pale, psiral Id urn. 

 Pronotum without a median impunctate area, except narrowly and vaguely 

 toward base ; elytra usually concolorous. 

 Sides of tlie prothorax broadly rounded ; pygidium evenly parabolic. 



svltwarziaiiiini. 



Sides of the prothorax vaguely subangulatc in the middle, the punctuation 



very fine, extremely dense ; pygidium triangular with the apex narrowly 



subtruncate velutiiium. 



Elytra not wider than the prothorax; second antennal joint of the male but 

 slightly shorter than the third, the latter etjual in length to the fourth. 



parvuluin. 



T. parallolum Casey, 1891, 1. c. 23. 



Length 12-14 mm. = .48-. 56 inch. Habitat. — Colorado, New Mexico. 

 Black, elytra uniform red-brown, pubescence short, very dense. 



T. soliwai-ziaiiiiin Casey, 1891, 1. c. p. 24. 



Length 14 mm. =^ .56 inch. ; width .18 inch. Habitat. — Michigan (Marquette). 

 Piceous black, pubescence short and dense; resembles vehduiam. 



T. parviiliini Casey, 1891, 1. c. p. 24. 



Length 8 mm. = .32 inch. ; width .88 inch. Habitat. — Indiana. 



Resembles ciwiamopterum, but has shorter legs, and the antennse 

 are not appcndicidato. 



More detailed descriptions than here given would cause confusion ; 

 none of Mr. Casey's types have been seen ; the species as they now 

 stand seem uncomfortably close, and there are some individuals 

 which, by a strict interpretation, cannot be assigned to any of them. 



Hylotrupes litigiosus Casey, 1891, 1. c. p. 25, is a description of a 

 long-known variety of ligneus occurring on the Pacific coast. 



Phymatodes thoracmis Muls. is a synonym of lividus Rossi. 



TRANS. AM. ENT. SOC. XXIII. MAY, 1896. 



