Staphylinidce of the Amazon Valley. Q5 



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

 7 th segment of the hind body is emarginate in the middle, 

 and on each side of the middle, so as to form four almost 

 equidistant teeth ; the middle ones are short prominences, 

 the lateral ones are quite as elongate as the middle ones 

 and more slender and more spine-like. 



Kio Purus ; a single male found by Dr. Trail (after 

 whom I have named the species), on the 13tli Oct. 1874. 



Obs. — This species in the structure of its tarsi and 

 sternal processes much resembles H. gilva; it is rather 

 larger than that species, has the surface less opaque because 

 less densely punctured; the antennjB differently coloiu'ed, 

 with the 4th joint larger, and the male characters different. 

 From H. brevis, the less densely punctured upper surface, 

 and the different structure of the intermediate joints of the 

 antennae, readily distinguish it. It is probable that the 

 individual described is a little immature. 



6. Homalota culpa, n. sp. Rufo-testacea, antennis apicem 

 versus pallidioribus ; capite, elytrorum medio, abdomineque 

 ante apicem, infuscatis; capite, thorace, elytrisque sub- 

 tiliter punctatis, abdomine impunctato; prothorace trans- 

 versim subquadrato. Long. corp. 1| lin. 



Antennae stout, moderately long, a good deal thickened 

 towards the extremity, the basal portion yellowish, the 

 apical very pale yellow ; 2nd and 3rd joints elongate, about 

 equal to one another ; of 4 — 10 each is distinctly broader, 

 but scarcely shorter than its predecessor, the 4th longer 

 than broad, the 10th rather strongly transverse; the 11th 

 joint rather stout, as long as the two preceding together. 

 Head broad and short, without distinct neck, a good deal 

 narrower than the thorax, finely punctured, infuscate. 

 Thorax about as broad as the elytra, a good deal broader 

 than long, the sides a little rounded in front, distinctly 

 narrowed behind the middle, the hind angles distinct but 

 very obtuse, the sides and base with a very fine but dis- 

 tinct margin ; the colour is yellowish, the surface very 

 finely punctured without channel or fovea. Elytra broad 

 and short, a little longer than the thorax ; their hind 

 margin not (or scarcely) sinuate at the outer angles, their 

 colour yellowish, but with a very broad, ill-defined, smoky- 

 violet colour across the middle, their punctuation fine and 

 rather dense. Hind body broad, a little rounded at the 



TRANS. ENT. SOC. 1876. — PART I. (MAY.) F 



