SUBORDER MALLOPHAGA. 227 
Xanthocephalus in being a little larger, the clypeus more rounded inter- 
nally, and in the absence of occipital bands, and in the median bands 
of abdomen not sharply defined. 
Nirmus pallidus n. sp. 
Almost white throughout. Head bluntly conic in front of antennz, as long as 
wide; clypeus concave, a rather deep ventral furrow running from tip to mandibles; 
mandibles chestnut, a single hair at posterior angle of temporal lobes, widening 
behind; occiput convex, slightly emarginate in center; antennsw with basal joint 
larger than others, but short ; second joint longest, fifth joint almost as long as second, 
third and fourth equal; prothorax rather narrow ; metathorax broadened with lateral 
angles but little behind center and bearing several stiff hairs; posterior border sub- 
angulate, a few hairs toward the outer margin; legs uncolored, claws tinged with 
brown; abdomen elliptic, uncolored, sparsely hairy at sides posteriorly. 
Taken from rose-breasted grosbeak (Habia ludoviciana), Ames, lowa. 
All specimens, four in number, show the pallid character of immature 
individuals, but as the largest shows no more coloring than smallest, 
and all appear to have chitinous framework thoroughly developed, it 
seems proper to consider them fairly mature, at least. I can not con- 
nect them with any described species, and believe the above diagnosis 
will serve to distinguish them even if additional material should bring 
to light more mature specimens. 
Nirmus secondarius n. sp. 
Type circumfasciati. Head longer than wide, rounded in front and slightly conic; 
antennal band strong, thickened at margin; trabecule conic; antenn rather long, 
first joint strong, second joint slender as long as third and fourth together; eyes 
prominent; temporal lobes narrowing behind, two hairs, one at middle of lateral 
margin the other at posterior angle; occiput slightly sinuous; thorax narrow; pro- 
thorax slightly widened behind, a strong bristle at posterior margin; metathorax 
contracted for one-third its length, widening behind; posterior margin regularly 
curved with stiff hairs set in pairs; legs strong, anterior femora with a prominent 
callosity at tip above; abdomen widest behind the middle, marginal bands strong, 
projecting deeply into preceding segment, and recurved in segments 1 to 5 and very 
slightly in segment 6; genital spot running from sixth segment to the tip and 
widening posteriorly. Color uniformly light brown, more prominent on margin of 
head; thorax and abdomen separated by clear lines on the sutures and by a median 
light line longitudinally in the front portion of the disk. 
On Corvus americanus, Ames, Lowa. 
Nirmus orpheus n. sp. 
Head large, rounded in front, with continuous marginal band; antenn slightly 
darker toward apex, eyes distinct; temporal lobes with blackish margin shading 
gradually toward the disk, with two hairs; occiput slightly concave; prothorax 
short, transverse; metathorax more than twice as long as prothorax, enlarging 
posteriorly; a hair at lateral angles; legs fuscous, somewhat more dusky on the 
dorsal border of femur and tibiw; tip of femora subannulate; abdomen enlarging 
posteriorly, margin without deeper bands, median bands broad separated by wide, 
clear space on the sutures, those on the sixth, seventh, and eighth segments merging 
into a median stripe. 
Length, 1.60 mm.; head, 0.5 mm.; abdomen, 0.9 mm. Width, head, 0.37 mm.; 
abdomen, 0.5 mm. 
Described from two male specimens, both of which appear to be 
scarcely mature. 
