146 C. ZIMMKRMANN, M.D. 



short cylindrical, obliquely decliyous behind, without tubercles or denticles, 

 finely punctate-striate, intervals with erect hairs, thickly placed in rows. — 

 Pennsylvania. 



X. retusicollis Zimm. — Long. 1 lin. Ferruginous yellow; front smooth, with 

 a deep longitudinal impression; prothorax longer than wide, a little broader' 

 than the elytra, punctured in front, thinly pubescent, and very deeply excava- 

 ted; the front margin rising into an acute point; behind nearly glabrous an<l 

 smooth. Elytra short, punctured without order, thinly pubescent, obliquely 

 declivous behind, and somewhat impressed along the suture. — Maryland. Found 

 under oak-bark. 



C. — Middle and hind tibigp triangular, acutely toothed on the outer 



edge, as in the genuine Bo.'^trj/chi.- 



X. [ caelatus Eiehhoff, Berlin Entomologische Zeitschrift, 1867, p. 402.] — 

 Long. IJ lin. Brown, ferruginous, and sometimes blackish, antennte and 

 feet ferruginous; very similar to the genuine Bostrychi, cylindrical, tliinly 

 pubescent; prothorax in front roughly tuberculate, thickly punctured be- 

 hind, except a narrow smooth longitudinal line; elytra coarsely punctate- 

 striate, the sutural stria deeper, marked with transverse punctures, inter- 

 vals with smaller distant punctures; obliquely declivous behind, on ac- 

 count of the slightly elevated and feebly toothed side margin the declivity is 

 somewhat concave ; the suture is elevated, and each side of it are seen three 

 elevated teeth, which stand near the side margin, but do not form parts of it; 

 the marginal teeth are smaller, and often scarcely visible. — Atlantic States. 

 Very abundant on pines. 



BOSTRYCHUS Fabr. 



The name Bostriclius (more properly Bostryclius) was first applied 

 by Geoffroy to Apatp. capucina. Fabricius applied it to all the insects 

 belonging to the tribe here under consideration, probably because the 

 meaning of the name appeared to him more applicable to them than 

 to Apate. Latreille adopted the nomenclature of Geoffroy, and there- 

 fore proposed for the Bostrychi the name Tomicus, which has since 

 been commonly adopted. More recently Erichson has divided this genus 

 into many subgenera, of which those above defined (^Crypturgus, Xi/- 

 lehorus and the present) can be regarded as well defined groups. 



The body in the species of the present subgenus is short cylindrical ; 

 the prothorax is longer than wide, convex, roughly tuberculate in front; 

 the elytra are obliquely suddenly declivous behind, and excavated, with 

 the elevated margin toothed, while in the two preceding subgenera the 

 posterior declivity of the elytra is formed in a different manner. The 

 females differ from the males in the form of the prothorax, which in 

 the former is somewhat longer and narrower in front. The species 

 live mostly under the bark of coniferous trees; they appear sometimes 

 in countless multitudes, and do immense mischief by killing the trees 

 in the forests of pine and fir ; as was the case with B. pini in Caro- 



