No. i.] A STUDY OF SOME TEXAN PONERINAE. 17 



acuminate apex and with relatively longer and more numerous 

 basal bristles. The head of the adult larva (Fig. 7, c) is remark- 

 able for its length and the narrowness of the labrum, which is 

 nearly as long as the slender mandibles and provided with a 

 median tooth at its tip. 



The larvae of Pachycondyla (Fig. 8) are neither as slender as 

 those of Leptogenys nor as robust as those of Odontomachus. 



FIG. 6. Odontomachus haematodes Linn, a, adult larva ; l>, head of same 

 (dorsal aspect); c, tubercle. 



The ventral surface of the abdomen is distinctly flattened. 

 The head (Fig. 8, e) resembles that of Odontomachus, especially 

 in the shape of the labrum and mouth-parts. There is a strik- 

 ing difference between the tubercles of the very young and the 

 adult larva. In the former (Fig. 8, b, c) the tubercles are nearly 

 or quite straight, and somewhat longer and more pointed than 

 those of Leptogenys. They lack the terminal bristle. The bris- 

 tles about the base are somewhat irregular in their insertion. 



