41 
It is worthy of notice that Doctor Ashmead finds structural char- 
acters which require the separation of Leptogenys from Pachyeon- 
dyla, Neoponera, and other immediately related genera. The fact 
that Professor Wheeler found the habits, eggs, and larval characters 
of Leptogenys and Odontomachus so closely similar to those of Pachy- 
condyla only increases the significance which may well be attached 
to the differences in these respects between Hctatomma and the 
Pachycondyla series. 
HABITS OF PONERIDZ. 
The habits of the insects of the family Poneridz, with which the 
kelep would be associated in current zoological classification, were 
almost completely unknown until the recent investigations by Pro- 
fessor Wheeler. It is evident, however, from his interesting papers, 
that the Texas Poneridx studied by him must belong to series quite 
remote from the kelep. The eggs of the kelep, for example, are 
elliptical in shape and not cylindrical, as in Odontomachis and in the 
Poneride investigated by Professor Wheeler. 
The breeding habits and the characteristics of the eggs and larvee of the 
Ponerine exhibit striking deviations from those of other ants. I have not seen 
the eggs of Odontomachus, but throughout the month of May I have often hap- 
pened on the eggs of Pachycondyla and Leptogenys. These are white and of a 
slender, oblong shape, somewhat smaller in the latter than in the former genus. 
They differ in shape from the eggs in species of Hciton, Camponotus, Formica, 
Pogonomyrmex, Solenopsis, and Tapinoma; for the ants of these genera, repre- 
senting several subfamilies, agree in having elliptical and much less slender 
eggs than the Ponerinz. The Ponerinze also keen their eggs in niore regular 
packets, the long axes of the different eggs being placed parallel with one 
another.¢ 
It would probably be an advantage for the kelep to have eggs like 
those of the Odontomachus, which readily adhere in bundles and can 
be the more easily carried, but the difficulty is overcome by the greater 
intelligence of the kelep, which adroitly uses the posterior end of its 
Mesoponera Emery, Pachycondyla Smith, Huponera Ford, Neoponera Emery, 
and Hetomomyrmer Mayr. The genera Psilidomyrmex André, and Heteroponera 
Mayr, which I have not seen, appear to belong to this tribe. 
Tribe V. Hetatommini: This tribe is abundantly represented in Central and 
South America and in Africa. Only a few forms occur in North America, and 
these in the Southern States. The genera placed here at present are: Platy- 
thyrea Mayr, Alfaria Emery, Stictoponera Mayr, Hetatomma Smith, Gnamp- 
togemys Rogers, Acanthoponera Mayr, Paraponera Smith, Holcoponera Mayr, 
Rhytodoponera Mayr, Streblognathus Mayr, Dinoponera Roger, Paltothyreus 
Mayr, and Magaponera Mayr. 
Tribe VI. Drepanognathini: This is a peculiar little group known only from 
Asia and Africa, and but few species have been described, all falling into a 
single genus, Drepanognathus Smith. 
@ Wheeler, W. M., 1901, Biological Bulletin, 2:14. 
