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 difierent, 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 ochrotcenia, 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. spinipennis 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. ochrotcenia 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. 



