368 THE AMERICAN NATURALIST. (VOL. XXXVI. 
4. Ecitopora laticollis sp. nov. 
Length 3 mm. Pale fuscous; head black, elytra almost testaceous, 
thorax somewhat darker on the disk. First two abdominal segments with a 
lighter band at apex, abdomen elsewhere fuscous, legs alutaceous. Antenna 
fuscous, paler on three basal joints; beyond the third joint they are very 
gradually thickened toward the tips, joints 4-10 being not quite twice as 
wide as long. Eleventh joint conical, slightly longer than the two preced- 
ing. Thorax one and one-half times as wide as head and one and one-half 
times as wide as long ; widest at the middle, before which it is rather sharply 
narrowed; behind it is not so strongly narrowed. Front margin of the 
thorax somewhat concave on each side of the middle. Elytra not wider 
than the thorax at their base. Abdomen at base as wide as the prothorax, 
acuminate. 
This species resembles Æ. tenella in general color and appear- 
ance, but is larger, with darker head and much wider thorax. 
Described from numerous specimens collected in a nest of 
Eciton schmitti, February, 1901. 
HisTERID E. 
5. Ulkeus intricatus Horn. 
Two specimens of this remarkable histerid were collected in a 
nest of Eciton opacithorax Em., March 24, 1901. They agree 
very well with Horn's original description, except that the frontal 
carinze are divergent, not convergent above, and the network of 
fine raised lines upon the discal portion of the thorax is very 
faintly outlined in some places. 
Horn makes no mention of the peculiar structure of the setae 
with which the body is clothed. All the hairs upon the body 
are provided with long barbs. Those upon the head have the 
barbs shortest and scattered upon the central spine, but easily 
distinguished from it. Those upon the remainder of the body 
have no distinct central spine except at base, beyond which 
they split up into about five or six sharp barbs. Upon the 
dorsal surface of the body each forms a sort of stiff brush, 
which is flattened so as to appear very slender when seen from 
the side, but quite spreading when viewed from the front. 
1 Trans. Amer. Ent. Soc., vol. xii (1885), pp. 142-143. 


