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DESCRIPTION OF A NEW SPECIES OF 
ASELLUS. 
By 0, P. HAY. 
Asellus militaris. (Sp. nov.) 
Length of male 17 mm., of female 11 mm. Color brown, ornamented 
with irregular shaped yellow spots, somewhat symmetrically arranged on 
each side of the median line. Feet and caudal stylets with a tinge of rose. 
Upper surface of the body covered with minute scattered hairs. All the 
free margins of the body abundantly furnished with slender spines ; these 
longest on the lateral margin. Head narrow, only about one-half the width 
of the first thoracic segment; the anterior margin concave; antero-lateral angles 
obliquely truncated ; lateral margins diverging posteriorly, with a small 
outwardly projecting lobe at the posterior angle ; this lobe furnished with 
several short spines. Eyes comparatively small. Anterior segments of 
thorax concave in front, convex behind ; becoming less so to fifth segment, 
whose anterior and posterior margins are nearly straight. Sixth and sev- 
enth segments convex in front, concave behind, the concavity being deepest 
in the seventh. All the thoracic segments after the second about the same 
width ; the second a little narrower than the succeeding segments ; the first 
about three-fourths as wide as the widest. Antero-lateral angles of first 
segment excavated and filled by the broad epimera. Second segment very 
slightly notched in front. In the succeeding segments this notch is pushed 
further back and becomes deeper, especially in the last three. As the notch 
becomes deeper, the antero-lateral angle is lengthened and turned back- 
ward. The epimera again make their appearance in the fifth, sixth, and 
seventh segments, only partially filling the lateral notches. Postero-lateral 
angles of all the thoracic segments rounded. 
Abdomen sub-orbicular ; width and length equal ; anterior and pos- 
terior angles quite well marked. Posterior margin excavated at insertion 
of caudal stylets, prolonged behind into a median lobe. This, in the male, 
reaches back scarcely one-third the length of the pedicel of the caudal sty- 
lets, but in the female about one-half the length of the pedicel. Width of 
abdomen less than that of any of the thoracic segments, except the first and 
second, about equal in width to second. Antennulae shorter than the pe 
duncle of the antennae ; basal segment short, a little curved and having a 
diameter nearly three times that of the next segment ; second segment 
