38 Mr. S. Hirst on 
Schingustia, being weakly chitinized ; posteriorly it is inter- 
rupted in the middle, being practically divided into two 
portions or wings by a series of (median) longitudinal parallel 
striations; the anterior margin of the scutum is still entire, 
however, and bears the usual three hairs (median and anterior 
laterals) ; the pseudostigmata are placed on the lateral wings 
of the scutum, nearer to its anterior margin than to the poste- 
rior; the posterior laterals are sometimes placed on little 
platelets by themselves, but these may be united with the 
scutum. ‘There is also an additional transverse strip of chitin 
situated well in front of the scutum on the front margin of 
the dorsum. Pseudostigmata globular and furnished with 
longitudinal striations ; the stalk is short. Median anterior 
hair of scutum the shortest, being considerably shorter than 
the anterior lateral ones. Posterior laterals longer than, or 
sometimes equal in length to, the anterior laterals. All 
five hairs on the scutum are strongly feathered, especially the 
anterior ones. Ocular scutum wider in front than behind ; 
anterior eye large and rounded, the posterior also well de- 
veloped but considerably smaller. There are about 30-32? 
hairs on the dorsum ; they have the accessory hairlets poorly 
developed, but more visible than in Leptus similis. Dorsal 
hairs of palp feathered; those on the ventral surface of the 
base of the capitulum are quite short. Hairs on legs fairly 
well feathered. A single hair is present on the first and 
second coxe (epimera), but there are three on the third coxa, 
two of them being placed on the anterior margin. The 
striated rod-like sensory hair on the upper surface of the first 
tarsus is long and slender. ‘Tarsus of last leg elongated, the 
end narrowed but not abruptly. 
Length of body (not including capitulum) 220-330 p. 
Host. Several specimens from a chicken, Dallas, Texas, 
24. vil. 1916, collected by H. P. Wood (U.S. Dept. of 
Agriculture). 
Demodex melesinus, sp. n. 
?. Closely resembling D. folliculorum (of man), but 
smaller in size. Capitulum wider than long, but more elon- 
gated than that of D. folliculorum ; tubercle on capitulum 
exceedingly minute, being smaller even than that of D. folli- 
culorum (and much smaller than that of D. canis) ; apparently 
it is pointed. Body from a little less than five up to five 
and a half times as long as the width of the cephalothorax. 
Abdomen much longer than cephalothorax +capitulum. 
Measurements. Length of body (incl. capitulum) 200-217 p, 
of cephalothorax + capitulum 78-79 w, of abdomen 122-138 p, 
of capitulum 20 @ ; greatest width of cephalothorax 39-43 p, 
of abdomen 42-45 mw, of capitulum 27-29 pw. 
