No. i.] A STUDY OF SOME TEXAN PONERINAE, 21 



hooked bristles, which cause them to adhere together in packets 

 and thus facilitate their transportation by the workers. The 

 appearance of these peculiar hairs in the young and half-grown 

 larvae of one of our common Texas ants, Solcnopsis gcmi- 

 nata Fabr., is shown in Fig. 10. The very young larvae have 

 only simple bifurcated hairs, but when half-grown they have on 

 the dorsal surface of several of the segments, besides a much 

 greater number of these simple bifurcated hairs, several rows 

 of long and peculiarly contorted bristles, terminating in short 



FIG. 10. Solenopsis geminata. Fabr. a, very young larva; f>, furcate bristle of same ; r, half-grown 



larva; d, contorted furcate bristle of same. 



bifurcations. Still another modification of the " poils d'accro- 

 chages " is seen in Pogonomyrmex barbatns (Fig. 9), the young 

 larvae of which have the longer bristles serrate on the apical 

 half, so that they remind one of the hairs of certain mammals. 

 All of these modifications --the bristly tubercles of the Poner- 

 inae, the simple and contorted bifurcated bristles of Solenopsis, 

 the serrate bristles of Pogonomyrmex, and possibly also the 

 fascicles of uncinate hairs described and figured by Emery (loc. 

 cit.} for the larva of Sima natalensis F. Sm. --seem to subserve 

 the same purpose a most interesting example of independent 



