StaphyliyiidcB of the Amazon Valley. 73 



have come to pieces in the spirit in which they were pre- 

 served. 



Obs. — This minute insect is smaller than the Eiu-opean 

 G. boleti, and in size scarcely equals our smallest Oligotcs. 

 I find it not easy to see wdth distinctness the form of the 

 hind margin of 7th segment, but I believe the dorsal plate 

 has the hind margin a little obtusely prominent in the 

 middle, and has a curved spine on each side. 



2. GyrophcEna parvula, n. sp. Nigro-fusca, nitidula, 

 fere Itevis, elytris parce punctatis, antennis pedibusque 

 testaceis ; prothorace valde transverso, basi et lateribus 

 rotundatis. Long. corp. | lin. 



This species is extremely similar to G. pumila, but the 

 elytra are more distinctly, and not quite so sparingly 

 strewed with punctiu'es, which on examination with a high 

 power appear to me to be fine elevated granules ; besides 

 this, it is larger and broader, with the head especially a 

 good deal broader ; in other respects it appears extremely 

 similar to G. pumila. 



A single individual, found on the Rio Purus with 

 G. pumila by Dr. Trail. 



3. GyrophcBna parca, n. sp. Nigro-fusca, nitida, an- 

 tennis fiiscis, basi pedibusque testaceis ; parcissime punc- 

 tata, prothorace valde transverso, disco subtiliter quadri- 

 punctato. Long. corp. ^ lin. 



Antennffi short and stout ; the fom* basal joints yellow, 

 the others infuscate ; 3rd joint much smaller than 2nd, its 

 basal portion constricted ; 4th joint extremely small ; 5 — 

 10 similar to one another, each rather strongly transverse ; 

 11th short and obtuse. Head broad, but a good deal 

 narrower than thorax, shining, black, with a few very 

 fine punctures ; the eyes moderately large. Thorax 

 strongly transverse, much rounded at the base, and dis- 

 tinctly narrowed towards the front ; pitchy, very shining, 

 with four fine punctures on the middle, placed so as to 

 form the corners of a square. Elytra short, but a good 

 deal longer than the thorax, pitchy, shining, Avith a very 

 fcAv indistinct punctures. Hind body pitchy, slightly paler 

 at the base and extremity ; almost impuuctate, but not 

 quite so shining as the anterior parts. Legs yelloAV. 



In the male the hind margin of the dorsal plate of the 

 7th segment of the hind body is produced in the middle so 



