Staphyliiiidce of the Amazon Valley, 123 



(articulis 6 — 9 fuscis), pedlbus, abdomineque testacels ; 

 elytris viridi-cyaneis, minus discrete bifasoiatim cinereo- 

 tomentosibus. Long. corp. 5 lin. 



Mas: abdomine segmento 7° dorsali margine posterioi'e 

 medio obtuse angulato, angulo ipso exciso ; ventrali sat 

 producto, apice lato, leviter emarginato. 



Antennfe quite as long as head and tliorax, pale yellow, 

 with joints 6 — 9 infuscate. Palpi pale yellow; mandibles 

 pitchy. Head black, with a very slight greenish reflec- 

 tion, very coarsely punctured, but Avith a large impunctate 

 space on the middle ; it is just about as broad as the 

 thorax. Thorax narrower than the elytra, just about as 

 long as broad, shining black, Avith an irregular series of 

 coarse punctures along each side of the middle, and with 

 some other coarse punctures between these and the sides, 

 and Avith a short longitudinal impression in front of the 

 base in the middle. Elytra slightly longer than the 

 thorax, rather coarsely punctured, clothed at the base and 

 extremity with pale hairs, Avhich form two not very dis- 

 tinct transverse fasciae. Hind body yelloAv, with the basal 

 segment blackish ; the basal segments impunctate, and the 

 6th only sparingly and finely punctured. Legs yellow, 

 with the coxre black. 



In the male the three basal joints of the front tarsi are 

 distinctly dilated ; the hind margin of the dorsal plate of 

 the 7th segment is a little produced, so that it Avould form 

 in the middle a very obtuse angle, but where the angle 

 would be there is a very small excision ; the ventral plate 

 is distinctly produced in the middle, but the middle part 

 is not acuminate, but forms a rather broad lobe, Avhich 

 has its hind margin a little emarginate. The styles of 

 the 8th segment are yelloAv, and are broad at their ex- 

 tremity, Avhich is very densely set Avitli short, black, file- 

 like setfe, and both on the upper and under side there is 

 an additional short roAV of such setas very near the 

 extremity. 



Garrao ; a single male, found in fungus by Dr. Trail, 

 on the 11th November, 1874. 



Obs. — This species is very closely allied to P. ventralis, 

 but the male characters are a little different, and the 

 thoracic punctuation is rather coarser. 



9. Plociopterus vh'gineus, n. sp. Niger, nitidus, an- 

 tennis ex parte, pedibus, abdomineque rufo-testaceis ; elytris 



