Genus Megarhinus. 
233 
than the mid cross-vein, the latter small, forming a very obtuse 
angle with the posterior cross-vein ; halteres with pale stem, 
pale scaled knob slightly fuscous inside. 
Length. —9 mm. 
9 . Head covered with bronzy, green and blue flat scales, 
the blue forming a border round the eyes ; palpi long, with black 
scales showing purple reflections, the apices of the joints very 
brilliant mauve as in the £ , a few silvery-white ones at the sides, 
second and fourth joints about equal, the third twice as long 
as the second (last joint missing) ; antennae brown, densely 
pilose, basal joint nude, black with cinereous reflections ; eyes 
bronzy. 
Thorax with greenish-coppery scales, prothoracic lobes with 
azure-blue scales, also over the roots of the wings and a few 
at the sides and at the back ; scutellum covered with flat azure- 
blue scales; metathorax chestnut-brown; pleurae black with 
silvery-white scales. 
Abdomen with the basal segments covered with green scales, 
the apical ones with blue and purple scales ; there are also small, 
white, apical, lateral spots. Wings with azure-blue scales 
towards the base, mauve ones on the costa and first and second 
long veins towards the middle. 
Length. —8 mm. 
Habitat. —Georgia; St. Domingo, Para (Walker) ; PortpRico 
(V. Roder); St. Vincent (Williston). Coquillett also gives 
Benoit, Mississippi. 
Time of capture. —Mississippi in July. 
Observations. —Described from two £ \s and one 9 specimen 
in the British Museum collection, evidently named by Walker ; 
one was placed as M. ferox, Wied., from Georgia, another specimen 
I find unnamed from Para, and another from St. Domingo. The 
single 9 rather damaged. The penultimate tarsal joint of the 
hind legs only is white in this species, and thus can be easily told 
from the closely related M. ferox , Wied., or M. Gilesii, mihi, or 
M. immisericors , Wlk. 
9. Megarhinus lutescens. n. sp. 
(Fig. 29, PL VIII.) 
Thorax brown, with small dull bronzy scales above and 
broader mauve and green ones at the sides, and an azure patch 
over the roots of the wings; pleurae yellowish, darker in the 
