Coleoptera from the Hawaiian Islands. 527 
longitudinally. Basal ventral segment forming an ele- 
vated longitudinal process in the middle between the 
hind coxe. Front tibie sharply carinate externally. 
The capability of packing up the limbs and head 
reaches its extreme in this genus, and they look, and no 
doubt roll about, like little black or dark seeds when their 
members are thus packed up. 
AGLYCYDERIDA. 
ProrERHINvs, Sharp. 
With regard to this genus I have to make a correction 
of some importance. When I described it (Trans. Ent. 
Soc. 1878, p. 20), Iwas of opinion that the individuals 
in which the head was produced into a distinct beak were 
of the male sex, and so described them without any 
hesitation. Mr. Blackburn had, however, a conviction 
that the rostrate sex was the female, and Dr. Leconte’s 
opinion that the genus should without doubt be referred 
to the Rhyncophorous series tended to confirm Mr. 
Blackburn’s idea, it being the rule in that series that the 
head of the female is more decidedly rostrate than it is 
in the other sex. Accordingly, when making the second 
set of descriptions of species of the genus (Trans. Ent. 
Soc. 1879, p. 95, et seq.), I refrained from committing 
myself to any opinion on the subject by speaking of the 
rostrate and unrostrate sex, without saying anything of 
the male or female. Since then Mr. Blackburn has 
transmitted to me additional specimens of P. vestitus, 
and, by dissecting an unrostrate individual, I have 
obtained satisfactory evidence of its being the male. In 
the present paper | therefore speak of the rostrate sex 
as the female, and I ask that it shall be noted that in my 
first paper, loc. sup. cit., I reversed the sexes. Iam now 
able to describe six additional species of this interesting 
genus, and anticipate that others still unknown exist in 
the archipelago. 
Proterhinus hystrix, n. s. 
Angustulus, elongatus, rufo-ferrugineus, haud squa- 
mosus, setulis erectis vestitus ; prothorace subquadrato, 
antrorsum constricto, lateribus setulis elongatis con- 
spicuis armatis, fortiter denseque punctato ; elytris elon- 
gatis, humeris liberis, parum elongatis, fortiter punc- 
tatis, setis elongatis, erectis munitis. Long. 3 mm. 
