332 Bulletin American Museum of Natural History. [Vol. XXI, 



My observations on the dark-colored luctuosuin are much less com- 

 plete than those on the typical apiculatum, owing to the fact that I 

 saw only two colonies of the subspecies in Colorado and one at Pres- 

 cott, and was unable to devote much time to observing the more 

 numerous colonies found on the rim of the Grand Canon. L. luc- 

 tuosum, seems always to be associated with pine trees. At any rate, 

 the colonies in Cheyenne Cafion, Colorado, and at Prescott were 

 ascending the trunks and had their nests under the large roots of 

 pines. L. luciuosum, moreover, was the only form of the species seen 

 in the Coconino pine forest on the rim of the Grand Canon. 



Notwithstanding its restless activity and highly carnivorous in- 

 stincts, L. apiculatum seems to tolerate quite a number of myrmeco- 



philes. In the runways of this ant in the 

 Paisano Pass two different Tenebrionid 

 beetles (Ologlyptus anastomosis Say and 

 Argoporis sp.) and a Thysanuran (Atelura 

 sp.) were frequently met with. These are 

 probably merely synoeketes, or indifferently 

 tolerated guests. Two truly myrmeco- 

 philous beetles, however, belonging to 

 the Aleocharine Staphylinidae, namely, 

 Apteronina schmitti and Dinardilla liome- 

 topi, both described some years ago by 

 Wasmann,^ are known to occur only with 

 L. apiculatum. They were discovered by 

 the late Rev. P. J. Schmitt, O. S. B., at 

 Cotopaxi, Colorado, not in the "nest of 

 Liometopum," as Wasmann states, but in 

 the runways of these ants, as Father 

 Schmitt once informed me. These beetles 

 were sought in vain in the Paisano Pass 

 and at Ft. Davis, but I had no difficulty in finding them in the Garden 

 of the Gods and in Cheyenne Canon near Colorado Springs. There 

 were sometimes as many as four or five of each species under a 

 single stone covering one of the runways. They seem to lie in wait 

 and take toll in the form of honey-dew from the ants that are 

 traversing the burrow on their way to the nest. According to 

 Wasmann, "the structure of the tongue of Apteronina indicates 

 that this insect is fed from the mouth of its hosts, like Atemeles, 



Fig. 2. Apteronina schmitti 

 Wasmann. 



» Zwei neue L4ometo/»Mm-Gaste aus Colorado. Wien Entomol. Zeitung, 20. Jahrg., 7. Heft 

 30 Sept., 1901, pp. 145-147. 



