66 Mr. D. Shai"!) s Contributions to the 



sides and narrowed behind, yellowish in colour, with the 

 6th segment infuscate, shining and without punctuation ; 

 beneath finely and closely ])uncturcd and pubescent. Legs 

 pale yellow. Tibiic slender and elongate. 



Tapajos; two specimens. Perhaps found in company 

 with Oxypoda aliena, which the species much resembles, 

 though it is a good deal larger. 



Ohs. — In this species the genre are immarginate; the 

 middle coxai are widely sejiarated; the apex ol" the meta- 

 sternum is truncate and separated from the little produced 

 portion of the mesosternum by a narrow black space. The 

 anterior tarsi are 4-, the intermediate and posterior 

 5-jointed; the basal joint of the middle tarsus is about 

 equal in length to the 2nd joint; the basal joint of the 

 hind tarsus is elongate and about equal in length to the 

 two following joints together. 



Tachyusa. 



About thirty species, most of them European, are at 

 present included under this generic name; none of them 

 ai*e from tropical America, but two are described by 

 Fauvel, from Chili. The genus has not yet been treated 

 of by Rey, but we may confidently expect that in the 

 forthcoming part of his Avork the name Tachyusa Avill be 

 used with a very different application to that of the works 

 of Erichson and Kraatz. 



As regards the two species here described I need only 

 remark that they appear closely allied inter se, and that 

 they are not nearly allied to any of our European species. 



1. Tachyusa picticornis, n.^^. Testacea, nitidula, fere 

 impunctata, an tennis articulis 3 — 6 rufescentibus, 7 — 11 

 albidis. Long. corp. 1§ lin. 



Broader than T. ferialis. Antennae long, reaching 

 about to the end of the elytra, rather stout for this genus, 

 a little thickened towards the extremity ; joints 1 and 2 

 yellowish ; .3rd joint one and a half times the length 

 of the 2nd ; 4th about as long as the 2nd, but stouter ; 

 5 — 10 each just a little shorter and stouter than the pre- 

 ceding, 5th much longer than broad, 10th about as long 

 as broad ; last joint long and pointed, two and a half times 

 the length of the tenth ; joints 3 — 6 brownish, those be- 

 yond abruptly paler, almost Avhite. Head about as broad 

 as the thorax, yellowish ; the eyes black, large and pro- 



