448 My. H. W. Bates on the Longicorn Coleoptera 
the forest. The following slight local modification was found 
only at Fonte Boa, 120 miles in a straight line north-west of 
Fga. 
“Local var. Ch. postilenatus. Like the type, except that the 
oblique ochreous belt of the elytra is continuous from the sides 
to the suture, and is also prolonged as a stripe along the sides 
to the shoulders. 
This variety wholly replaces the Ega form at Fonte Boa. At 
Cayenne a nearly allied undescribed form* occurs, which, al- 
though apparently very different from Ch. Egaensis, I believe to 
be a local modification of it. A species which varies in a small 
degree from locality to locality a short distance apart becomes 
modified in a greater degree in a more remote district and under 
more greatly changed local conditions ; at least, the distribution 
of closely allied species and varieties, when carefully studied, 
seems to point to this conclusion. 
Genus PHACELLOCERA. 
Castelnau, Anim. Artic. ii. p. 468. 
Char. emend.: Antenne long and slender, eleventh joint about 
as long as the tenth, and filiform in both sexes ; first joint slen- 
der at the base, and enlarged about the middle into a thick pyri- 
form club ; third joint thickened at the tip; fourth also sometimes 
dilated at its apex, and furnished with a small brush of hairs. 
Body elongate, parallel-sided, depressed. Thorax narrow, the 
lateral tubercles small, acute. The mesosternum plane or bi- 
tuberculated, its hind margin depressed in conjunction with the 
fore edge of the metasternum, as is the rule in the Anisocerine. 
The fore tarsi in the ¢ are not dilated, and scarcely fringed. 
I. think the followmg species may be comprised in this 
genus :— 
1. P. plumicornis, Klug, Entom. Bras., specimen alterum, 
pl. 42. f. 5. South-east Brazil. 
2. P. Buquetii, Guér. Icon. R. A. p. 240. Cayenne. 
3. P. Batesii, Pascoe, Trans. Ent. Soc. Lond. 1858, n. s. iv. 
Upper Amazons. 
4. P. limosa, un. sp.t Venezuela. 
* This is extremely rare in collections; and I regret being unable, from 
having no specimen at command, to give a description of it. 
+ P. limosa. Corpus parum elongatum, depressum, fuliginosum, pilis mi- 
nutis squamiformibus cinereo-fuscis vestitum. Antenne (2 ) corpore 
vix longiores, articulo quarto simplici. Caput et thorax punctata, 
hujus tuberculis lateralibus brevibus acutis, dorso trituberculato. Elytra 
passim granulato-punctata, singulis prope basin tuberculo magno cris- 
tato, et postice fasciculis duobus pilorum munitis. Antennz fusce, 
articulo tertio apice valde dilatato. Long. 6lin. 2. Hab. Venezuela, 
