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XIV. On the number of joints in the antennae of Haliplidae 
and Paussidae (Coleoptera). By Tuomas G. SLOANE. 
Communicated by H. E. Andrewes, F.E.S. 
[Read October 5th, 1921.] 
HALIPLIDAE. 
AUBE’S statement in 1838 (Spec. Gen. Col., Dejean, vi, 
p. 3) that Haliplus has 11-jointed antennae is the earliest 
record of the number of these joints that I have seen, but 
all more recent authorities that I know give the number 
as ten (cf. Lacordaire, Gen. Col., 1854, 1, pp. 410 and 411; 
Leconte and Horn, Class. Col. N. Am., 1883, p. 60; 
Ganglbauer, Kifer Mitt. Eur., 1892, 1, p. 412). The idea 
of 10-jointed antennae for Haliplus must have originated 
between 1838 and 1854, and subsequently to the latter of 
these dates I have seen no question as to its being correct ; 
but after carefully examining the antennae of H. variegatus 
Sturm, and H. ruficollis de Geer, I cannot make the number 
for these two species as other than eleven, a number 
consonant with the usual number in the sub-order Cara- 
boidea. The jomts of the antennae of Haliplus must 
always have been examined in situ, and it would confer a 
benefit on entomology if some skilled microscopist would 
detach an antenna of Haliplus from the head, and give an 
accurate drawing of it, showing the number of joints. 
PAUSSIDAE. 
In the genera of the tribes Cerapterini and Paussini of 
the family Paussidae, according to the books, the number 
of joints in the antennae is ten, seven, or two, but in all 
the genera of these tribes which I have been able to 
examine there is one more joint than the books say. This 
is a small (or very small) second joint, which is usually 
almost wholly received into the apex of the large basal 
joint, and which forms a rotula for the clava of the antennae. 
Though this little joint is overlooked, or ignored by modern 
authors, it actually exists. It was recorded for Hylotorus 
by Dalman in 1823 in his diagnosis of that genus (as quoted 
by Westwood in the Arcana Entomologica, i, p. 40). 
Westwood, too, recognised its presence in 1843 in his 
diagnoses of the genera Pentaplatarthrus (lL. c. 38), Lebvoderus 
(l. c. 39), and Platyrhopalus (/. c. 74), and in his synoptical 
TRANS. ENT. SOC. LOND. 1921.—PARTS III, IV. (JAN ’22.) 
