33 
of the hind tarsus, yellowish; under side of fourth tarsal segment 
more or less yellowish. Hind metatarsus elongate, parallel-sided, 
about six times as long as broad, one half broader than the re¬ 
maining tarsal segments, one third longer than the remaining seg¬ 
ments together. Tarsal claws trifid. Halteres fuscous, wing veins 
yellowish, the costa and radius with minute black spines. 
Length, 2^4 mm. (alcoholic specimens, about 4 mm.) ; wing, 
about 3 mm. 
Female .—Slaty gray, invested with silvery white pubescence on 
dorsum of thorax and abdomen and on legs, slightly denser 
Fig. 2. Simulium johannseni , front of head 
of„female. X 35. (Not reliable as to struc¬ 
ture of palpi.) 
than in the male. Antennae and palpi about as in the male. 
Face slaty gray, a little longer than broad, sides parallel, nearly 
straight; invested with sparse whitish hairs; front like the face in 
color and vestiture, narrow between the eyes, at the narrowest point 
about as wide as the thickest part of the antennae; just below this 
point a narrow sinus about twice as deep as the narrowest width of 
the front; front above widening to about twice this width. 
Fig. 3. 
Fig. 4. 
Figs. 3, 4. Simiiliutn johannseni : Fig. 3, right hind leg of female (X 11); Fig. 4, tarsal claw 
of right hind leg of female. 
