StapliylinidcB of the Amazon Vullci/. 61 



different from one another in length, but the 4tli not more 

 than half as broad as the 10th ; this latter as well as the 

 preceding joints strongly transverse ; lltli joint moderately 

 long, quite as long as the two preceding together. Head 

 short and broad, but distinctly narrower than the thorax, 

 black, very finely pimctin-ed, the punctures absent from 

 a longitudinal space on the middle, and the hinder part 

 slightly impressed on the middle. Thorax almost as broad 

 as the elytra, twice as broad as long, very finely and 

 moderately closely punctured, with a slight depression on 

 the disc. Elytra a good deal longer than the thorax, 

 finely and moderately closely punctured. Hind body dis- 

 tinctly narrowed towards the extremity, the basal seg- 

 ments finely and rather closely, the apical ones sparingly 

 punctured. Legs yellow, but a little infuscate. 



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

 7th segment of the hind body is furnished in the middle 

 Avith three rather approximate, equidistant, similar spines, 

 and on each side with an extremely long, slender, pointed 

 spine, which is a little incurved. 



A single male was found by Dr. Trail at Barreiras de 

 Janarape, Rio Solimoes, on the 9th January, 1875. 



Obs. — This species has the middle tarsi 5-jointed ; the 

 middle coxfe are distinctly separated, the meso- and meta- 

 sternal processes both acuminate, and meeting one another 

 about half-way betAveen the coxfe ; the genre appear to me 

 to be very finely margined. It much resembles the 

 European H. indiscrcta, Sharp, but is decidedly smaller, 

 and has the male characters very different. 



2. Iloinahta tenax, n. sp. Fusca, pedibus testaceis, an- 

 tennarum basi fusco-testaceo, thorace abdomineque seg- 

 mentis basalibus obscure rufescentibus ; antennis crassius- 

 culis ; thorace transverso, elytris breviore ; abdomine sub- 

 parallelo, segmentis basalibus sat crebre, apicalibus parce 

 punctatis. Long. corp. 1^ lin. 



Antennae stout, moderately long, black, the basal joint 

 obscurely pale ; 3rd joint stout, nearly as long as 2nd ; 4th 

 smaller than the others and scarcely so long as broad ; 5 — 10 

 differing but little from one another, each distinctly trans- 

 verse ; 11th joint rather elongate, fully twice as long as 

 the 10th. Head short and broad, finely and not densely 

 punctured, nearly black. Thorax a little narrower than 

 the elytra, broader than long, slightly rounded at the sides 



