1915.] Wheeler, Additions to the Ant-Fauna of North America. - 395 ° 
12. Solenopsis geminata sevissima F. Sith. 
In a recent revision of the Solenopsis species of the geminata group, 
Forel has made the important discovery that one of the forms generally 
attributed to this species lacks the large soldier phase, so that the worker 
caste is much less polymorphic. This form he originally described as the 
subsp. pylades from a female taken in Mexico, and to it he later referred 
workers from Colombia, Amazonas, Para, Sao Paolo, Argentina, ete. 
I have recently revised the large amount. of geminata material in my collec- 
tion, and, although I am able to recognize most of the forms cited by Forel, 
I find myself unable tosaccept his interpretation and the name pylades. 
Forel is undoubtedly right in regarding this as a distinct form, but it is 
equally certain that it had been previously described by Fred. Smith under 
the name sevissima. In the first place, Smith’s description is unusually 
good and applies perfectly to the typical yellow pylades. In the second 
place, his specimens were received from Bates, who gives.an interesting 
account of the habits of this “ fire ant ”’ in Brazil. Moreover, Mr. W. M. 
Mann, who collected extensively in the region where Bates secured his 
specimens and made his observations, tells me that it is there the only 
common and widely distributed Solenopsis, and the numerous specimens 
collected by Mr. Mann prove to be typical pylades Forel. I believe I am 
justified, therefore, in resuscitating Smith’s sevissyma and in relegating 
pylades to the synonymy, but owing to the existence in the United States 
of the two following forms, which are clearly intermediate between sevissima 
and geminata, I am unable to regard the former as anything more than a 
subspecies of the latter. 
13. Solenopsis geminata xyloni MacCook. 
This form is widely distributed in Texas and is probably the same as 
the ant described by Buckley as Myrmica sabeana. 'The worker measures 
2-5.5 mm. in length. The largest specimens are shaped like moderately 
large geminata workers, with rectangular head and the tips of the antennal 
scapes reaching on the sides of the head half way between the eyes and the 
posterior corners, but the surface of the head is much smoother and the 
scattered punctures much smaller, though larger and more conspicuous 
than in sevissima. The mandibles are not abruptly curved as in the largest 
workers of the true geminata. The color is variable, being in some of the 
largest workers deep red, with the posterior half of the gaster black, in others 
