DYAR-KNAB] MOSQUITOES IN GENUS MEGARHINUS 251 
uniform for either sex in all the specimens examined. We have 
seen no specimens of Megarlunus from North America with the 
front and middle tarsi entirely dark. 
MEGARHINUS MOCTEZUMA new species 
Male.—Head behind the eyes clothed with iridescent scales, at 
the sides and beneath silvery. Antennz densely plumose; second 
segment longer than in septentrionalis, stout, laterally compressed, 
about as long as the three succeeding ones; heavily scaled along the 
crest. Palpi deep violet, on segments 2-4 scatteringly golden-scaled 
above and at the sides, entirely golden beneath, the apices pale lilac. 
Second and fourth segments of about equal length, the third longer, 
the fifth as long as the third and fourth together. Prothoracic lobes 
deep blue. Mesothorax dark brown on the disc with coppery scales ; 
the median and lateral stripes of greenish blue scales; hind margin. 
scutellum and patches over the roots of the wings metallic blue. 
Pleurze and coxe silver-scaled with a tinge of yellow. Abdomen 
deep violet-blue, segments 6, 7 and 8 brilliant purple. First segment 
bright blue, more shining. Segments 2-7 with marginal golden 
spots, very narrow on the second segment and broadening to sixth 
and seventh where they become conspicuous patches. Segments 6, 
7 and 8 margined behind with gold. Beneath pale golden, a narrow 
median blue line on segments 3-7; eighth segment entirely purple 
beneath. Lateral hairs pale yellow on segments 1-7, dark on the 
eighth and the genitalia. Legs dark with blue and purple lustre. 
Femora golden beneath. Front tibiz on the outside, middle tibize 
on the inside, dull golden. Middle legs with the third tarsal seg- 
ment white on the outside, a dash of silver at the base of the fourth 
segment. In the hind legs the fourth tarsal segment is white- 
ringed, black at its tip. 
Female.—Antenne: second segment somewhat longer than the 
third, slightly swollen basally, the basal two-thirds heavily clothed 
with purple scales. Palpi deep blue and purple, the segments pale 
at the apex; second and third segments with golden scales at the 
sides and beneath; second and third segments laterally compressed, 
the third slender at base, much thickened at apex; fourth segment 
stout and cylindrical, shorter than the second, the third twice as long 
as the fourth. 
Abdomen greenish-blue merging into steel blue posteriorly, the 
eighth segment violet. Seventh segment finely margined with gold, 
eighth with terminal brush of bright yellow hairs. The hind angles 
