272 Mr. D. Sharp's Contributions to the 



maxillary i^alj)! a little dilated in the middle on the inner 

 side and ])()int('d at the extremity ; 4th joint very minute. 

 Head Avitii a slender neck. Thorax subglubose, the horny 

 portion of the prosternnm large, so that in the natural 

 position it extends as far back as the front edge of the 

 mesnsternum ; but the side pieces of the prothorax are not 

 contiguous with this, so that the anterior coxal cavities 

 are quite open behind. IVIesosternnm large, forming a 

 Avell-marked neck. Tarsi apjjarently only four-jointed, 

 the 3rd joint being short, esi)eeia!ly on the ujiper side; its 

 lower surfiice longer and hairy, and the 4th joint consisting 

 of a membrane, hairy beneath, enwrap] )ing the sides and 

 nndersurface of the iifth joint on the hind foot ; the basal 

 joint is as long as the rest of the tarsus. Front tarsi 

 undilated in botli sexes. 



'J'his genus is allied to Simius, but cannot be amalga- 

 mated therewith, owing to the different structure of the 

 prosternnm. Its facies and form are also different, and 

 approach JJthodiaris and Scopcens. It forms a connecting 

 link between the Pcederidce with closed anterior coxal 

 cavities and those in which these are widely ojjen, and 

 its position in the usually adopted scheme of classification 

 is between lAthoclutris and Sunius. The above characters 

 are drawn from a Ivio de Janeiro species, of which I give 

 a diagnosis in the subjoined note.* 



1. Monista certa, n. sp. Ivufo-castanea, nitidula, an- 

 tennis, palpis, pedibus, elytrorumipie a{)ice testaceis; ca})ite 

 thoraceque fortitcr punctatis, hoc subgloboso linea media 

 impunctata ; elytris fere impimctatis. Long. corp. L^ lin. 



Antennas yellow, about as long as head and thorax ; 

 1st joint nearly as long as the two following together, 

 2nd almost as stout as 1st; 3rd quite as long as and rather 

 more slender than 2nd; 4 — 8 each slightly shorter than its 

 predecessor, bead-like, about as long as broad ; lOth qua- 

 drate, slightly larger than the intermediate joints; 11th 

 rather stouter than lOth, about as long as 9th and 10th 

 together, pointed. Head rather broader than thorax, 



• Monixta tijpica, n. sp. Castanca, nitidula, pedibus testaceis, antcnnis 

 basi ai)i(0<|iic testaceis, ineiljo i)bsenrioril)Us, articuio deciiiio leviter traiis- 

 versi) ; ciipite crcbre fnrtiter puiictato ; jjiothnrace suljj^loboso, fortiter scd 

 obsolete punctato; elytris tliuracc loiigii>iibus, obsolete puiietatis. Long. 

 ci>rp. 1 i liii. 



Jfiib.—\\\ci Janeiro. 



Closely allied to J/, crrta, but rather larger, with the thorax more 

 obsolitely imncturcd and the antenna; clouded in the middle. 



