Descriptions and Records of Bees. 235 
Demodex equi, Raill. 
? .—This species is much wider than is usually the case 
in the genus, the width (in mounted specimens) being about 
a third of the total length of the body. Cephalothorax + 
eapitulum longer than abdomen; the latter has the posterior 
end widely rounded off or else bluntly pointed. Capitulum 
distinctly wider than long; the two rods on its dorsal surface 
are not very long, but stout and blunt at the end. 
Measurements——Length of body (including capitulum) 
200-220 yw, its width 68-70 pw. 
Material.—I have examined two adult female examples of 
this species from English horses (Leslie Linzell’s collection). 
This Demodex causes a definite skin disease in horses. 
EXPLANATION OF PLATE IX. 
Fig.1. Demodex ratti?, Hahn. Ventral aspect. 
Fig. 2. muscult, Oudms., nymph. Ventral aspect. 
Tig. 3, —— , female. Ventral aspect. 
XXV.— Descriptions and Records of Bees—LXXVI. 
By T. D. A. CockerELL, University of Colorado. 
LToplitis anodontura, sp. n. 
6 .—Length about 10 mm.; anterior wing 7, 
Robust, black, with mostly white hair, but on vertex, disc 
of mesothorax, and abdominal segments 2 to 4 (except the 
apical bands) it is pale ochreous; facial quadrangle longer 
than broad, face densely covered with white hair; antenne 
short, looking like those of a female, the flagellum red beneath 
except at base ; vertex and cheeks with strong dense punc- 
tures, but shining between the punctures ; mesothorax and 
scutellum very densely punctured ; area of metathorax polished 
and shining; tegule shining black. Wings strongly infus- 
cated, brownish, the b.n. meeting t.-m., and second s,m, 
long. Legs black, punctured, with glittering white hair; 
inner side of tarsi with pale reddish hair. Abdomen shining, 
but very well punctured; segments 1 to 5 with entire, 
narrow, white hair-bands; sixth segment very broadly 
rounded and at sides obtusely angulate, but not toothed. 
Mexico (G. F. Baker Collection, 2499). 
Compared with H. adunca, the type of a eo this 
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