of the Amazon Valley. 
257 
Distinguished from X. spinipennis, Serv., by the small 
size of the head,, and the peculiarly flattened eyes^, be- 
sides its glabrous integument. The sculpture of the 
thorax is also entirely different^ consisting of a number 
of distinct and rather fine transverse furrows^ which 
cover the whole surface, leaving only a small space on 
the hinder part of the disc smooth. 
4. Xestia oclirotcenia, n. sp. 
Oblongo-linearis, vix convexa, nigra, elytris castaneis, 
vitta utrinque ochracea ab angulo humerali usque ad 
apicem extensa, antice intus solum angustata. 
Long. 1 un. 2 lin, ? . 
Belongs to a group of species of less cylindrical form 
than X. spmipennis and its allies, and having much less 
robust antennae without perceptible difference in length 
between the fourth and fifth joints. They agree, how- 
ever, in the closure of the intermediate sockets, and in 
the spineless apices of the hinder femora and tibiae, and 
are, moreover, connected with the typical forms by 
species showing all the intermediate gradations. 
X. ochrotcenia is closely allied to X. lateralis, Erichs. ; 
judging from the description, there is no difference be- 
tween them, except the mode in which the yellow vitta 
is narrowed to the humeral angle. Erichson^s words are 
vitta laterali antice extus abrupte, intus sensim attenu- 
ata."’^ In X. oclirotcenia the vitta shows the inner gradual 
narrowing, but the outer edge is perfectly straight. The 
head and thorax are coarsely punctate - rugose, or 
scabrous ; the elytra are finely coriaceous and punctulate, 
the apex is rounded, and there is a small spine only at 
the sutural angle. The ochreous vitta forms a well- 
defined moderately broad stripe, of equal width through- 
out, except the narrowing near the base, and not quite 
touching either the base or the apex ; it is moderately 
distant from the lateral margin, and curves slightly to- 
wards the sutural angle. The sides of the elytra near 
the base have a depressed space rather more distinctly 
sculptured than the rest of the surface. 
Hah. — Upper Amazons. 
