252 SMITHSONIAN MISCELLANEOUS COLLECTIONS [voL. 48 
of segments 2-8 marked with gold. Beneath golden, a dark median 
line ends before the eighth segment. 
Fore and middle legs with the second and part of the third tarsal 
segments silvery white; hind legs with the fourth and upper half 
of the fifth tarsal segments white. The white on the front tarsi is 
not so brilliant as in the two preceding species and in trinidadensis. 
Length, 6-9 mm. 
Type No. 9953, U. S. N. M. 
Localities: Sonsonate and Izalco in Salvador, Rio Aranjuez near 
Puntarenas in Costa Rica (F. Knab), Antigua in Guatemala (D. G. 
Fisen). 
16 g, 2 9. In the male the white of the middle tarsi has a ten- 
dency to become silvery and less distinct; sometimes the silver at 
the base of the fourth segment is absent. In three specimens the 
white of the third segment extends entirely around it. Although 
the tarsal markings are the same as those of the preceding species 
it can be easily separated by the coloration of the thorax and other 
details. Preparations of the male genitalia of the two species reveal 
specific differences. 
MEGARHINUS TRINIDADENSIS new species 
Male.—Head behind the eyes light blue with pearly lustre, at the 
sides and beneath silvery. Antennz densely plumose, the second 
segment long and stout (stouter than in moctezuma and longer than 
in septentrionalis), its crest densely clothed with nearly flat purple 
scales. Palpi blue and purple, segments 2, 3 and 4 in certain lights 
largely silvery and iridescent and pale at the apices. Second seg- 
ment slightly shorter than fourth, third longer ; fifth as long as third 
and fourth together. Prothoracic lobes bright metallic blue. Meso- 
thorax clothed with light green scales on the disc, light blue along 
the sides. Scutellum, ridge of scales over the root of wing and first 
abdominal segment brilliant greenish blue. Pleuree and coxe 
silvery. 
Abdomen deep blue, purple on segments 6, 7 and 8. Beneath 
golden, a narrow black median line on segments 3-7, eighth seg- 
ment violet. Lateral hairs pale, dark on eighth segment and 
genitalia. 
Legs dark with blue and purple lustre; femora golden beneath; 
front tibie golden on the outside. Second segment of middle tarsi 
bluish-silvery on the outer side. In the hind tarsi the fourth and 
most of the fifth segments silver-scaled. 
Ee 
