1909] JOHANNSEN — NORTH AMERICAN HENICOCEPHALIDAE 3 
Henicocephalus culicis Uhler. 
1892. Hymenodectes culicis Uhler; ‘Trans. Maryland Acad. Se. 181. 
1892. Henicocephalus schwarzii Ashmead; Proc. Ent. Soc. Wash. II, 329. 
1908. Henicocephalus culicis. Knab; Proc. Ent. Soc. Wash. 7. 
“Pale, smoky testaceous, tinged with piceous on the lobe of the head which 
holds the eyes, and on the tumid lobe behind this. Immature specimens have the 
front of head, pronotum, excepting the base, and scutellum yellow. Texture thin 
and flabby, the veins of the wing-covers coarse and dark colored. The last joint of 
the antennae infuscated. Rostrum pale piceous, the apical joint yellowish. Inter- 
mediate and posterior tibiae and margins of venter pale testaceous.” 
“The suborbate posterior lobe of the head a little longer than the lobe carrying 
the eyes, constricted abruptly both before and behind, a little narrower than the 
width across the eyes. Posterior lobe of pronotum widely sinuate behind, exposing 
the base of the transversely convex, and at apex acuminate, short scutellum. Wing- 
covers narrow, membranous throughout.” 
To the above description may be added the following: ‘The antenna (fig. 5) 
has a minute intermediate joint between the first and second, second and third, and 
third and fourth long joints; the basal joint is much shorter than the others, the third 
joint is rather longer, the fourth slightly shorter than the second; the third is quite 
slender. All joints are sparsely haired. ‘The beak (fig. 6) is four jointed, sparsely 
setose; apical joint is triangular in outline, third joint is about as long as the second 
and fourth taken together. The apex of the fore tibia (fig. 3) is provided with seven 
stout spines, and a comb of fine setae on the side nearest the body. ‘The fore tarsus 
is one jointed, has two stout spines on the flexor surface and at its apex a pair of claws, 
the inner one of which is somewhat longer than the other. The middle and hind 
tibiae each have two spurs; the middle and hind tarsi are each two jointed, the basal 
joint being very short, claws subequal (figs. 2 and 4). 
The venation of the fore wing (elytra) is shown in fig. 1, the short cell under 
the stigma is somewhat variable in shape, the curved vein which forms its posterior 
margin sometimes being more curved up at the apex. In one specimen, a male, this 
curvature is quite pronounced (fig. 7). ‘The hind wing has three very indistinct 
ongitudinal veins; the first and second separated by a cross vein near the middle of 
the wing. ‘The sexes appear to be much alike. In the male the eyes are slightly 
larger, closer together ventrally; the abdomen is clavate, the second segment being 
narrower than the first, and the eighth segment is somewhat narrower in proportion 
