
No. 425.] THE TEXAN LEGIONARY ANTS. 377 
discal ones. Thorax seen from the side considerably larger than the head, 
the dorsum regularly arcuate. Coxæ as usual, the anterior ones rather short ; 
legs slender, the tarsi long, spurs of four posterior tibiae well developed. Wings 
nearly as long as width of thorax, clavate, about two-thirds as wide at base 
as at apex, where they are rounded truncate. Wings very strongly bristly, 
the macrochete longer than the wing, the longest being one and one-half 
times as long, much more slender than those on the wings of Acontistoptera. 
All the bristles are on the distal three-fourths of the outer margin, about 
seven on the upper edge and three or four below. Abdomen of the usual 
shape with the dorsal plate of only the fourth segment visible ; it is quad- 
rate, somewhat narrowed in front and about as wide as diameter of second 
antennal joint. The gland opening on the fourth segment small and with 
the margin hardly at all thickened. The posterior margin of the four 
anterior abdominal segments marked off by wide rows of enormous mac- 
rochztz which extend more than halfway across the abdomen. Each row 
contains about twenty bristles, those in the anterior rows being somewhat 
the longest and nearly equaling the wing bristles in length and thickness. 
Each bristle is not simple but composed of two distinct pieces, a short, 
stout basal piece, apparently contiguous with the abdominal cuticle and 
hollowed out into a spoon-shaped dorsal cavity at the apex into which the 
bristle is articulated. Fifth, sixth, and seventh segments faintly indicated 
by marginal bristles and by constrictions. Abdomen everywhere sparsely 
short hairy. Sexual organs smaller than usual. 
12. Xanionotum hystrix sp. nov. 
Length 1.25 mm. Light yellow, almost white, the head much darker 
rochaetze fuscous. Thorax tinged, darker above, especially in front. Legs 
concolorous with the body, tarsi darker yellow, legs finely black hairy. 
Described from a single female specimen ! collected at Austin, 
Texas, March 24, 1901, in the same nest of Eciton opacithorax in 
which the specimen of Acontistoptera melanderi was discovered. 
Although the nest was carefully sifted it revealed no other 
specimens of either form. 
This form is undoubtedly the most remarkable phorid which 
we have collected here, and although it was so closely associated 
with the other new genus here described, there seems to be no 
possibility of considering them as dimorphic forms of a single 
species, as almost every part of the body is quite different in 
1 We have since found another exactly similar specimen with the same ant, 
December 6, 1901 - : 
