146 RHYNCHOPHORA. 
black, its first joint not reaching to the middle. Prothorax transverse, constricted in front, sides strongly 
rounded in middle; disc black, with anterior margin ferruginous, densely granulate, with short erect 
hairs, median line nearly obsolete. Elytra a little wider than the prothorax and twice as long, separately 
rounded and crenate at base, parallel-sided to hinder third; brown, covered with close short scales, which 
are lighter in patches, forming an irregular tessellation, punctate-striate, the punctures oval, interstices 
subconvex, granulate towards base, behind with single series of small tubercles and semi-erect sete. Legs 
plack; knees and tarsi reddish ; anterior tibie rather strongly dilated and finely serrate. 
Hab. Panama, Volcan de Chiriqui (Champion). 
One example. This species resembles Hylesinus sericews, Mann., which has, I believe, 
been lately referred to Hylurgops. It is, however, much larger, with a less elevated 
median line on the prothorax, deeper elytral striz, the interstices more strongly granu- 
late towards the base and more conspicuously setose. Moreover, the basal joint of the 
antennal club is relatively larger. 
6. Hylastes subcostulatus. 
Hylastes subcostulatus, Mann. Bull. Mosc. 1853, 2, p. 289'; Lec. Trans. Am. Ent. Soc. i. p. 176 
(1868). 7 
Hylurgops subcostulatus, Lec. Rhynch. N. Am. p. 390°. 
Hylastes alternans, Chap. Syn. Scol. p. 22 (Mém. Soc. Liege, 1873, p. 230) *. 
Hab. Norru America, Alaska !, Oregon and Sierra Nevada? 3, California (Ricksecker). 
—Mexico+, Jacale and Suapam (Sallé), Omilteme in Guerrero (H. H. Smith). 
One specimen, taken at Omilteme, in addition to three from M. Sallé’s collection. 
The species is easily recognized by the alternate interstices of the elytra being costate 
and coarsely tuberculate towards the apex. 
DENDROCTONUS. 
Dendroctonus, Erichson, Wiegm. Archiv, 1836, 1, p. 52; Chapuis, Syn. Scol. p. 34 (Mém. Soc. 
Liége, 1873, p. 242) ; Leconte, Rhynch. N. Am. p. 384; Dietz, Trans. Am. Ent. Soc. xvii. 
p- 27 (1890). 
Three species of this genus occur in Central America. 
1. Dendroctonus terebrans. 
Scolytus terebrans, Oliv. Ent. iv. 78, p. 6, t. 1. figg. 6, a, b°. 
Dendroctonus valens, Lec. Pacific R.R. Expl. and Surveys, Ins. 59°; Chap. Syn. Scol. p. 35 (Mém. 
Soc. Liége, 1873, p. 243) *. 
Dendroctonus terebrans, Lec. Trans. Am. Ent. Soc. i. p. 173 (1868) *; Rhynch. N. Am. p. 385°; 
(?) Chap. Syn. Scol. p. 35 (Mém. Soe. Liége, 1878, p. 248) °; Dietz, Trans. Am. Ent. Soe. 
1890, p. 29". 
Hab. Nortu America 4, Canada® and United States 23457,—Mexico, Salazar (Hége), 
Parada (Sallé); GuaTEMALa, Coban in Vera Paz (Conradt). 
The Central-American examples present no important variations from the form 
