Sept, i, 1921 Solenopotes capillatus, a Sucking Louse of Cattle 
799 
side opposite the point of attachment of the antennae and toward the posterior margin 
of the head another pair, somewhat longer than any others, about the same distance 
from the median line 
Thorax. —About 200 jx long by 344 n wide, deeply incised anteriorly to receive the 
head, narrowed somewhat anteriorly and with rounded sides. Division of thorax 
fairly distinct dorsally and the mesothorax and metathorax bearing at the margin a 
rather prominent but not projecting spiracle. Prothorax with two rather strong sub¬ 
median spines and mesothorax with two or three small and one strong spine. Sternal 
plate about 172 fx long by 114JU wide, not very highly chitinized, slightly narrow pos¬ 
teriorly, anterior end truncate, posterior end rounded. 
Legs.—R ather short and stout, anterior pair much shorter, more slender, and less 
chitinized than others. They terminate in long, slender claws, while the posterior 
legs are provided with highly chitinized dark reddish brown terminal segments and 
blunt claws. A few short hairs on all leg segments. 
Abdomen. —Elongate oval, narrowing gradually to terminal segment which is 
broadly rounded; abdomen dorsally with a considerable number of yellowish, rather 
slender spines distributed as follows: First segment, 
two transverse rows, anterior with 8 or 10 spines irregu¬ 
lar in length, posterior with from 4 to 6; second, from 4 
to 6; third, 6; fourth, from 6 to 8; fifth, from 6 to 8; 
sixth, 8; seventh, 6; eighth, 2; the last rather longer 
than the others. Near the lateral margin of the second 
to seventh segments is a single spine on each side, 
those on the sixth and seventh being two or three 
times as long as the others and hairlike toward their 
tips. On the venter the spines are less variable in 
number than on the dorsum, the second to eighth seg¬ 
ments with 4 submedian spines, the outer pair on second 
segment being small and those on the eighth segment being farther removed from the 
median line and very long and hairlike at tips. Near the lateral border on either side 
is a single row of spines on the third to seventh segments, those on the sixth and 
seventh segments being long (longer on the seventh) and hairlike toward the tips. 
On the posterior margin of the eighth segment are two genital flaps or protuberances 
margined with 7 rather stout spines (fig. 3). Between these on either side are 2 
minute spines, and from the middle to the anterior border of this segment near the 
median line are 3 pairs of very short spines. The chitinized bands on the terminal 
segments are rather narrow dorsally and broad on their ventral margins. There is a 
slight projection on this band in the internal anterior angles which bears 3 or 4 stout 
spines on each side near the margin. Just anteriorly from the inner angles of the bands 
occur on each side a group of about 6 moderately stout spines, and mesad from their 
borders about 3 small spines. 
The second to eighth segments are provided near their anterior margin with pro¬ 
jecting, rather large spiracles 29 n in diameter. 
THE MALE 
While Enderlein’s 1 description of the male is fairly complete, it is 
deemed advisable to redescribe this sex and point out some of the 
variations in the distribution of the abdominal spines. 
Length 1.2 mm., width 0.6 mm. 
Head. Length 287 n, width 208 /i. Rather broadly rounded anteriorly (fig. 4), 
widest just behind antennae which are attached about one-fourth of the length of the 
Fig. 3.— Solenopotes capillatus : 
Eighth and terminal segments of 
abdomen of female. X 53 % 
1 Endereein, Gunther, op. cit. 
