RECLASSIFICATION OF SUBFAMILY AGRYPNINAE 117 
Compsolacon by the absence of a carina on the posterior angles of the prothorax 
and from Colaulon by the absence of tarsal grooves on the propleurae. Kishii 
(1961 : 25) reduced Cryptolacon to a subgenus of Colaulon (q.v.). 
Sabikikoreus Nakane & Kishi. This subgenus of Agrypnus was erected on 
the basis of a number of variable characteristics including the shape of the body, 
the presence of tubercles on the pronotum, the propleural tarsal grooves, the lateral] 
carinae of the prothorax and the appearance of the terminal abdominal sternite 
(see below). Kishii (1964 : 15) raised Sabikikoreus to generic status. 
Sagojyyo Kishii. The type-species yuppe Kishii possesses all the diagnostic 
characters of Agrypnus. It differs from the type-species, murinus (Linnaeus) 
only by such very variable features as the shape of the body, the presence of tarsal 
grooves and the presence of nodules on the pronotum. 
Ohira, 1968) : 364 and 1969a : 93 uses the erroneous spelling Sagojo. 
Archontoides Cobos. The diagnostic characteristic, the sloping humeri, is 
associated with the reduction of the wings. The metasternum and scutellum are 
also reduced in length. See also Myrmodes, p. 115. 
Pyrganus Golbach. The genus was established for eight Central American species 
differing from Colaulon in that the lateral margins of the prothorax are not crenate. 
The type-species tuspanensis possesses all the generic characteristics of Agrypnus 
and differs from the type-species murinus Linnaeus only in the colour and arrange- 
ment of the scales clothing the body, a character which is of importance only at 
the specific level. It is of interest that in two of the species included in Pyrganus 
by Golbach (paleatus Champion and scarrosus Candéze) the lateral margins of the 
prothorax are distinctly crenate. L. dwbiuws Candéze, another species included 
in the new genus by Golbach, is not congeneric with the remaining species. It 
is a true Lacon species. 
SEXUAL DIMORPHISM. Ina large number of species it is impossible to distinguish 
the sexes by external characteristics. However the present investigation has 
shown that the males and females of certain species display differences in the appear- 
ance of one or more of the last three visible abdominal sternites and that in other 
species the sexes can be separated on the structure of the antennae or tarsi. 
Candéze (1874 : 43) was the first to record that in the female of certain species, 
the central area of the last visible abdominal sternite is smooth, whereas in the 
male the entire surface is punctured. Champion (1894: 263) appears to have 
been unaware of Candéze’s discovery because he states that the smooth patch is 
typical of the male. Lewis (1896 : 336) accepted Champion’s statement. That 
this did not orginate from a printer’s error is shown by the fact that all the specimens 
in the BMNH labelled as males by Champion and Lewis are females and vice- 
versa. This type of sexual dimorphism is not found in all species, and does not 
occur in any Australian species. 
_ The appearance of the surface of last visible sternite varies greatly from one 
species to another but it is constant within a species. The form of the differentiated 
area, where it occurs, ranges from a slightly raised patch with a well defined outline 
