ate, Mr. F. P. Pascoe on some 
Elytra oblonga, apicibus integris. Pedes graciles; cox antice 
exert, approximate ; femora linearia, compressa; tarsi angusti. 
Abdomen segmentis longitudine fere equalibus. Processus inter- 
femoralis angustus. 
@. Caput magnum, breve; oculi supra haud approximati ; 
infra valde distantes; palpi breves. Antenne corpore breviores, 
levigate, haud suleate, apices integri. Prothorax brevis, antice 
latior. Elytra depressa, apicibus rotundatis abdomine breviora. 
Tarsi minus angusti. Abdomen segmentis primo ad quartum 
gradatim brevioribus. Processus interfemoralis latus. 
As will be seen from the above, there is a very con- 
siderable difference between the sexes, but not more than 
occurs between several other genera of Prionide ; and it 
is, I think, one reason why they should be treated as 
a family rather than as a subordinate group. I refer 
this genus to the neighbourhood of Monodesmus, the 
female of which is unknown according to Lacordaire, 
although Serville speaks of the two sexes as having 
similar antenne. 
Syennesis dispar. (Pl. XIV., figs. 6, 3, 7, 2). 
3. $8. oblongus, piceo-fuscus, antennis corpore infra, pedi- 
busque pallidioribus, his pubescentibus; prothorace rude et sub- 
confertim punctato. Long. 9 ln. 
‘2. Latior, omnino rufo-castaneus, nitidus ; prothorace leviter 
et sat parce punctato; elytris depressis, minus punctatis, basi pro- 
thoracis vix latioribus. Long. 18 lin. 
Hab. St. Catharine’s (Brazil). 
The male rather narrow, pitchy-brown above, body beneath, 
antenne, and legs paler; prothorax more than twice as broad as 
long, closely and coarsely punctured, its posterior angles acute ; 
scutellum small, triangular; elytra much broader than the pyro- 
thorax, closely punctured; tarsi, especially the posterior, linear. 
The female is much broader, more depressed, reddish chestnut, 
the head nearly as broad as the prothorax, which is nearly as 
broad as the base of the elytra, and finely and somewhat sparsely 
punctured; elytra not closely punctured, each having, as in the 
male, a slightly-raised line not extending to the apex, and covering 
the abdomen only to the middle of the penultimate segment. 
