SUBORDER MALLOPHAGA. 245 
Menopon expansum n.sp. (PI. II, fig.7). 
Abdomen very broad, ovate. Head with a sinuous margin and very deeply emar- 
ginate occiput; orbital sinus entirely covered; temporal lobes with two long bristles 
and two or three short hairs; prothorax nearly as broad as head and closely fitting 
into the occipital cavity, the lateral angles in contact with temporal lobes; posterior 
margin semicircular; metathorax short, rounded in front, with two bristles at the 
lateral angles; legs robust, femora very large, irregularly set with short hairs; 
abdomen nearly as broad as long, uniformly yellowish brown, margins of segments 
above with a closely set series of hairs which are longer at the lateral] angles poste- 
riorly, and the entire ventral surface irregularly set with short hairs arising from 
minute clear pustules. 
Length, 1.31 mm.; head, 0.18 mm.; abdomen, 0.80 mm. Width, head, 0.47 mm.; 
abdomen, 0.80 mm. 
On Dolichonyx oryzivorus. Burnett collection (No. 67). Distinguished 
by the extreme width of the abdomen. 
Menopon interruptus n. sp. (PI. I, fig. h). 
Light yellow, with conspicuous dark-brown bands and black lines. Abdominal 
bands of female broken and irregular near margin of segments3and5. Legs strong, 
lined with black. 
Head semicircular in front, a few hairs on margin, antenne scarcely passing mar- 
gin of head, orbital pits deep, fringed with hairs behind; temporal lobes rounded, 
three long bristles arising from circular clear spots, dark brown on front, each side 
connecting with orbital black spot, temporal margin deeply infuscated occipitally; 
prothorax with sharp lateral angles broader than long, posterior margin rounded; 
metathorax broad and long, widening rapidly behind, posterior margin rounded, 
produced over abdomen, sides deep brown; sternal markings, on prothorax a 
brown patch broadening in front, acute behind, and with the blunt process behind 
the posterior lateral portion expanding and connecting with fuscous bands that 
extend latero-cephalad to the margin; on mesothorax a central pentagonal patch 
extending in fuscous bands postero-laterally and laterally; on metathorax a sub- 
triangular patch acutely angled behind, slightly convex in front; legs with enlarged 
femora, blackish border externally on femora and tibiz, and blackish annule at the 
apical end of tibiew; proximal joint of tarsus with an enlarged membranous disk; 
abdomen with sides somewhat parallel and heavy transverse bands, which in female 
are interrupted and dislocated upon the third to fifth segments, but particularly 
upon the fourth. 
Apparently a very common species upon the American crow (Corvus 
americanus), A number of specimens in the Burnett collection. Also 
collected at Ames, Iowa. 
_ Menopon fusco-marginatus n. sp. 
Head with rather deep orbital sinus, a large fuscous patch beneath with bands 
running latero-cephalad to the orbital sinus and posteriorly along the gular margin; 
prothorax with a miter-shaped sternal plate; abdomen with broad lateral fuscous 
margin, head rounded in front with scattering slender hairs, palpi reaching to the 
margin of the head; antenne barely visible, the orbital sinus beneath margined 
with stiff hairs and with a dark-brown border; temporal lobes broad, bearing three 
long bristles, head beneath with large brown patch forked in front, the branches 
extending to the orbital sinus and thence connecting with the brown spots at lateral 
margin of clypeus; prothorax broad, closely joined to head, posterior margin 
rounded beneath with an acuminate miter-shaped sternal plate and dark-brown 
bands; metathorax enlarging behind, legs strong, marked with brown, the distal 
portions of femora and tibiw annulate with dark fuscous; abdomen oval, margin 
broadly fuscous, fuscous bands crossing the disk but uniting into a long brown pateh 
upon the seventh, eighth, and ninth segments; posterior margin of the segments 
