226 INSECTS AFFECTING DOMESTIC ANIMALS. 
The species is specially marked by the presence of the central line 
on the abdominal segments 2 to 6, which, merging into the dark spots, 
resemble a series of locks. The general agreement with descriptions 
of furvus is very close and it is referred to this species. 
Nirmus rotundatus n. sp. 
Very broad and conspicuously marked with black and dark brown; type of lati- 
fasciati. Head cordate, regularly curved in front, very slightly conic, the tip 
barely truncate, the antenne and internal bands broad and prominent and inclosing 
a broad lateral clear space; also a broad, clear furrow from tip to mandibles, 
broadening in front of mandibles to form a wide, clear arc; trabecule inconspicu- 
ous, antenne short, first two joints thicker than others, all but first annulate with 
black, last three nearly equal; occiput slightly incurved, a long hair at posterior 
angle of temporal lobe; prothorax widening behind, dusky at sides; metathorax 
widening much behind, a blackish band running across a little behind the center of 
posterior margin, obtusely angled, set with bristles; legs large, femora at base 
above and tibiz on dorsal side heavily marked with black and dark brown; 
abdomen ovate, very wide, widest slightly in front of middle, with broad transverse 
bands above and below, those above broken on disk except on eighth segment; 
large, clear spaces surrounding spiracles; genital band arched on eighth segment 
and with slender, dusky stripes running forward and slightly outward on seventh 
segment; ninth segment with short band or double spot. 
This species is of the general type of varius, but much broader. In 
this respect it is similar to latifasciatus Piaget, described from Xulla 
mantola, but the clear spaces of the anterior part of the head are 
broader, the abdomen wider, the lateral bands extending farther 
toward the center, and circles around the spiracles larger, the head 
much more decidedly rounded in front, the clear spaces of clypeus and 
margin larger, and other characters indicating it to be a well-established 
form. 
Described from one specimen collected from crow (Corvus americanus), 
at Ames, Iowa. 
Nirmus picturatus n. sp. 
Head elongate cordate, one hair visible each side, margined with black, apex clear, 
margin widening to base of antennzx, and from this point directed inward one-third 
width of head and then back to side of head; temporal lobes narrowly margined, 
occipital bands not blackened, occiput not margined; antennz with joints sub- 
equal, annulate; prothorax or humeri in front and margin behind black; meta- 
thorax with broad, black band widened at sides to form submargin; legs strong, 
femora at base and tip and tibix at tip broadly annulate with black or dark brown; 
abdomen with broad, black margin on segments 1 to 7, broad ventral median bands 
on segments 1 to 5, faint on 1 and 2, not separated by median clear space, but with a 
transverse light band a little behind the middle of each dusky band; on segments 
6 and 7 a continuous black patch, narrowing to posterior part of seventh, and contin- 
ued as a narrow stripe to join the are on the eighth segment in female and extended 
to tip of body in male; a few scattering hairs at the tip of the body, with some light 
portions laterally on seventh segment; seventh and eighth segments with dusky are 
open in front, and eighth with a medial dusky spot and a marginal faint dusky spot; 
ninth unmarked, but indented at tip. The dorsal and ventral spots are not easily 
distinguished on account of thinness and transparency of body. 
Taken from Sturnella magna, Ames, Iowa. Very closely related to 
ornatissimus, but differs distinctly from species on Agelaius and 
