No. i.] A STUDY OF SOME TEXAN PONERINAE. 15 



much less slender eggs than the Ponerinae. The Ponerinae 

 also keep their eggs in more regular packets, the long axes of 

 the different eggs being placed parallel with one another. I 

 have not been able to determine the length of embryonic 

 development with accuracy. It seems to be much protracted, 

 as in other ants. Some eggs of P. harpax in an artificial nest 

 had not hatched at the end of five weeks. 



The larvae of the Ponerinae differ from those of all other 

 ants in several particulars, first made known by Emery. x Emery 

 describes and figures the larvae of Poncra stigma Fab. (New 

 Guinea), P. caffraria F. Sm. (Cape Colony), Diacamma rugo- 

 sum-gcometricum F. Sm. (Celebes), and Odontomachus liaema- 

 todes L. (Cayenne). All of these larvae agree in having the 

 mandibles powerfully developed for ant-larvae, the anterior 

 portion of the body long and slender and folded over the 

 abdominal portion, and in being covered with rows of peculiar 

 tubercles beset with more or less prominent bristles. 



The larvae of Pachycondyla and Leptogenys are here figured 

 for the first time. I have seen fit to figure also the Odonto- 

 machus larvae because my material was evidently in fresher 

 condition than that depicted by Professor Emery. The larvae 

 of the three genera may be arranged in a series beginning with 

 Odontomachus and terminating with Pachycondyla. 



The young larva of O. haematodes is represented in Fig. 5, a, 

 which shows the arrangement and character of the bristly 

 tubercules and the neck-like anterior portion, consisting of the 

 head, the three thoracic and the first two abdominal segments. 

 The remaining eight abdominal segments are much enlarged 

 and flattened ventrally. The larva is kept on its back, and the 

 neck-like anterior portion rests against the flattened ventral 

 surface. The shape of the tubercles, each of which is tipped 

 with a rigid bristle and encircled with bristles, is shown in Fig. 

 5, b. The larva was about to moult, so that the tubercle of the 

 succeeding cuticle is seen shining through the old one. The 

 adult larva is shown in Fig. 6, a. Compared with that of the 

 young larva, its head is very small in proportion to the body. 



1 "Intorno alle Larve di Alcune Formiche," Mem. della Accad. delle Scienze 

 dell Istittito di Bologna, 7. Maggio, 1899, 2. Tavole. 



