art.17. MONOPHLEBINAE AND MARGARODINAE—MORRISON. 13 
specimens ranging from 8 to 15 mm., width from 5 to 8 mm., dimen- 
sions of specimens as mounted on slide averaging slightly larger; 
derm remaining yellow brown or clearing almost completely on 
treating with potassium hydroxide; antennae 7-segmented, rather 
strongly tapering, the terminal longest, legs short, stout and heavy, 
the femur as well as the tibia and tarsus bearing a considerable num- 
ber of heavy spines; beak short and stout, indistinctly 2-segmented; 
spiracles apparently not differing from those of other species of the 
genus; with clusters of scattered, large tubular, trilocular pores at 
the body margin, and similar submedian clusters one on each side of 
the middle line anterior to the anal ring, a pair to a segment; also 
with normally trilocular pores scattered rather uniformly over the 
surface; ventrally, with somewhat longer trilocular pores, with 
circular multilocular disk pores, these with elongate oval centers, 
and occurring chiefly in the genital opening region, and with circular 
disk pores with circular centers and distinct internal tube, similar to 
those of pilosior, in clusters over indeterminate areas; body thickly 
set with spines as in the other species, these more numerous than the 
pores over much of body, quite small dorsally, averaging 35-43y 
long in the mid-dorsal region, some, in clusters, accompanying the 
dorsal groups of large tubular trilocular pores, considerably larger 
and longer; ventrally, opposite the small dorsal spines, averaging 
57-68u in length, offering a decided contrast to those of dorsum, 
those along margin the largest, the maximum length about 172y; 
without the lanceolate spines of fuscus or the specialized spine clusters 
of crawfordi, in this respect, as in the character of most of the pore 
types, resembling pilosior; anal tube as in the other species of the 
genus; ventral cicatrices arranged in transverse rows as in the other 
species but much more numerous, and in relatively broad bands 
instead of irregular single rows. 
Immature stages—None available for examination. 
Adult male.—Elongate, slender, length about 4 mm., maximum 
width (of flattened abdomen) about 1 mm.; head, antennae and legs 
dull pale brownish, thoracic lobes darker, with a blackish tinge, the 
wings slightly darker than the body, the anterior apical area darkest, 
the anal area nearly transparent; anterior apex of head triangular, 
antennae attached on basal portion of angles, posterior portion of 
head quadrate with the compound eyes strongly protruding and 
bulging; ocelli large, one placed just within each compound eye and 
nearly opposite its anterior margin; antennae more than 8-segmented 
(broken), the segments from III on elongate and slender, more or 
less distinctly constricted medially and each bearing a subbasal and a 
subapical whorl of long slender hairs; legs elongate, slender, bearing 
numerous long slender setae, these rather spine-like ventrally on tibia 
and tarsus; tarsus tapering, and slightly curved, without digitules, 
