16 Mr. T. Vernon Wollaston on the 
conjectures that " in all probability it really lived in the 
rafters." 
The -P. angustissimum is more nearly allied to the 
P. cylindricum from Ascension than to the English P. 
Hiittoni, but it is relatively veiy much narrower than 
either, its rostrum is a little longer, and its prothorax is 
more constricted behind the front margin, and more de- 
pressed (as in Mesites) dovm its posterior disc. Its elytra 
also are more closely sculptured, and have their interstices 
more raised. In its short antennae and small club it is 
more in accordance with the Ascension species than with 
the Enghsh one. 
Genus 4. Tychiodes (nov. gen,). 
Corpus oblongo-ellipticum, latum, depressum, sculptu- 
ratum, calvum : capite parvo ; rostro elongato, gracillimo, 
lineari, tereti ; oculis sat magnis, rotundatis, paulo promi- 
nulis; scrobe subrecta, vix ad oculum currente: prothorace 
brevi, rotundato-ovato, antice et prfesertim postice valde 
truncato : scutello subrotundato, valde conspicuo ; meta- 
sterno longiusculo (vix elongato) : elytris oblongo-eUipticis, 
basi late truncatis. Antenncs longiusculi, subgraciles, mox 
pone medium rostri insertas; scapo flexuoso, clavato; funi- 
culo 5-articulato, art.° l*"" sat magno rotundato-obovato, 
sequentibus inter se laxis, subperfoliatis, 2^° elongato, 
obconico, 3''°, 4'° 5*^°que longitudine sub^equalibus, lati- 
tudine crescentibus, 5*° ad capitulum magnum ovalem 
abruptum distincte annulatum baud adpresso. Pedes crassi, 
antici ad basin parum, intermedii paulo magis, et postici 
remote inter se distantes: femorihus muticis, et (pr^esertim 
anticis) crassis: tibiis ad apicem externum in uncum brevem 
productis: tar sis elongatis, art.'' I""", 2^° 3*'°que longitudine 
subfequalibus (1"^° paululum longiore), 3*'° reliquis multo 
latiore et distincte profundeque bilobo, ult."'" elongato 
clavato, unguiculis sat magnis armato. 
Obs. — Genus inter Cossonidas valde anomalum, dis- 
tinctum ; conspicuum est rostro elongato gracillimo lineari 
tereti, pedibus crassis, tarsorum elongatorum articulo tertio 
lato necnon conspicue profrmdeque bilobo, metasterno minus 
elongato (sed vix brevissimo ut in gen. Microxylobio), ab- 
dominis segmento primo bre^Hiuscido, corpore oblongo- 
elliptico latiusculo depresso (prothoraceque lato, brevi, 
transverse), etiam Tycldi formam fere simulante. Aliter 
exstat capite parvo, scutello valde distincto, antennis longi- 
