Dec., 1906.] 
Descriptions of New Mallophaga, II. 
35 
DESCRIPTIONS OF NEW MALLOPHAGA, II. 
E. P. Durrant. 
4. Physostomum merulae nov. sp. (Fig. 1, D.) 
Female: Body, length 4.7 mm., width 1.3 mm.; light ful¬ 
vous, of rather uniform color except abdomen, which has the 
lateral bands distinctly marked: of large size and evenly rounded 
outline. 
Head, length .75 mm., width .75 mm.; front broad and evenly 
rounded, margins diverging somewhat and slightly swelling, 
ocular notch medium, fleck distinct, notch with one small hair; 
temple extended posteriorly, slightly obtuse, three large bristles 
along margin evenly spaced, anterior two with one small hair 
between; occipital margin deeply" re-entering; labral lobes large; 
antennal fossae well-marked by brown bands on lateral borders, 
interior band much broader; palpi extending beyond margins; 
anterior submargin with four long, and numerous short hairs. 
Thorax, length 1.20 mm., width 1.04 mm.; prothorax broader 
than long, a little narrower than head, anterior convex, posterior 
concave, margins nearly straight except at anterior, which has a 
rounded notch; the anterior angle has two small hairs and a 
bristle; the rounded posterior angle has one bristle; marginal 
extensions of even width and clear. 
Metathorax larger than prothorax, rounded in front and 
widely diverging to rear, posterior margin slightly^ concave; two 
small bristles at posterior angle; lateral margins with wide light- 
brown band; lighter and narrower bands diverging from pos¬ 
terior of prothorax to posterior two-thirds of metathorax and 
uniting with marginal bands; legs same color as head and 
thorax, of medium size. 
Abdomen rounded oblong, first seven segments of nearly 
equal length; the transverse sutures straight; first four segments 
have a hair and a long bristle at angles, the next have two 
bristles and the eighth two long bristles on posterior border with 
a fringe of fine short hairs between; lateral line terminating 
abruptly on median border, but continued to lateral borders by 
a lighter shade, no lateral line on last segment. 
Description from specimen in Professor Osborn’s collection,, 
taken from Merula migratoria propinqua at Ft. Collins, Col., by 
C. F. Baker. 
This species bears a close resemblance to P. mvstax Nitzsch„ 
but is distinguished by larger palettes and the shallower and 
more anteriorly placed notch of the prothoracic extensions. 
