206 Dr. David Sharp on 
he has already come to a similar conclusion himself, and 
has recently made some remarks on the subject in the 
‘Transactions’ of the Society of Naturalists at Bremen. 
Perhaps I may be excused for calling attention to the 
interest that would attend the certain identification of 
the male of the insects of this genus. 
OponTomMAcHIDES.—Odontomachus ruficeps, Sm. (worker). 
Australia. The retractile portion of the second post- 
nodular segment is elongate, being quite equal in length 
to the exposed portion; it is covered with a dense very 
fine transverse sculpture of only a partially rectilinear 
character, but in the middle of the front portion of the 
retractile part there is a band, or rather a cone, of ex- 
cessively fine perfectly regular lines. The scraping edge 
of the preceding segment is in this species provided with 
a peculiar structure, the sharp edge just over the band 
being a little more turned downwards, so that it rakes 
more vertically over the lines; besides this the hind 
margin just in front of the band is thickened, and 
deviates minutely from a straight line; perhaps this is 
correlative with the turning down of the edge attached 
to it. 
OponromacHipEs.—A nochetus ghiliani (worker). Gib- 
raltar. The retractile portion of the second post-nodular 
segment is covered with a coarse somewhat irregular 
sculpture (like that of Ponera contracta), and there is no 
stridulating band. 
The great difference in abdominal structure between 
this and the Odontomachus ruficeps is remarkable in 
the case of two genera considered to be so closely allied. 
Anochetus ghitant has the retractile portion of the 
second post-nodular segment not half so long as the 
exposed portion, and the two parts are separated by a 
well-marked constriction of the true Ponera kind, this 
division being absent in the Odontomachus. 
Myruicipes.—Myrmica scabrinodis (worker). England. 
The base, or neck, of the segment behind the second 
node is quite short, and is at the sides covered with 
sharply raised, quite irregular, rather short, transverse 
lines; in the middle there is a broad space appearing 
perfectly smooth and polished, but which, under a high 
power, proves to be very regularly covered with straight, 
very fine ridges. The perfect regularity of these fine 
lines is highly remarkable. The edge, on the hind 
