
EXPEDITION TO SOKOTRA: NEW SPECIES. 17 
with the inner orbits red, and with two slightly diverging yellow marks 
between ; hinder orbits yellow, very widely so beneath, but ending in a 
detached dot above, at the level of the eyes. Antenne red, scape beneath, 
and face yellow, the latter clothed with a fine white pile; labrum somewhat 
tumid, reddish in the middle, the lower edge concave below. Thorax mostly 
black, pronotum red in front, and bordered with yellow behind. Mesonotum 
bordered with red on the sides ; tegulee red ; mesopectus black, clothed with 
whitish hair, and with two yellow spots, one behind the other, and the first 
largest, under the base of the fore-wings. Scutellum and _ postscutellum, 
yellow ; behind is a curve, broadest in the middle on the median segment ; 
beneath this, on each side, is a moderately short and broad red line. Abdomen 
with the first segment red above, bordered in front, and more narrowly behind, 
with black; a large yellow spot on each side. Segments 2-4 with broad 
yellow lateral bands, bordered before and behind, and broadly interrupted in 
the middle, with black; and bordered on the sides below with red ; the 
median black space on the second segment is also marked with red on the 
sides and more broadly behind. Terminal segments mostly red above ; 
fifth segment with a large oval yellow spot on each side. Ventral surface 
red, the segments narrowly edged behind with yellow, segments 3-5 black at 
the base, and segments 2 and 3 with a large yellow spot on each side. Legs 
reddish ; tibiz and tarsi yellow above. Wings of a slightly yellowish hyaline, 
the large nervures towards the base and costa reddish, the others black. 
Sokotra : Dahamis, 19. XII. 98 ; one specimen. 
(10) Stizus adelphus. 
Long. corp. 16 mm. ; long. al. ant. 14 (7?) mm. 
Male. Head black above and behind, the rest yellow. Space between 
the antenne and eyes yellow, ending in a small square semi-detached spot 
on each side of the frontal ocellus. Inner orbits narrowly yellow, ceasing 
at the level of the eyes, but connected with each other by a row of 4 small 
red spots; a yellow spot near the base of the back of the head. Face 
yellow, clothed with a very fine whitish pile, tips of mandibles, and the 
parts behind black. Pronotum black at the base, red above, and bordered 
behind by a slender yellow line. Antenne red, four joints before the last 
two blackish above. Thorax black, with the sides in front of the wings 
yellow, as well as an adjoining spot on the pleura ; tegule reddish ; scutellum 
broadly reddish behind, postscutellum bordered behind with yellow ; median 
segment with a short curved yellow streak marked with reddish behind 
towards the base on each side. Abdomen yellow, first segment red, bordered 
behind with black, which extends slightly to the base of the second segment ; 
second segment broadly bordered with black behind ; third segment bordered 
behind with red, preceded in the middle by black. Legs red, cox and 
trochanters black. Wings yellowish hyaline, with reddish nervures, the 
radial cell clouded. 
Sokotra : Hadibu Plain, 14. XII. 99 ; one specimen. 
Rhopalide. 
Rhopalum, Kirby. 
(11) Rhopalum quadricolor. 
Long. corp. 12 mm. ; long. al. ant. 8 mm. 
Female.. Dull black; head, clypeus and labrum clothed with bright 
silvery pile; back of head more sparingly. Scape of antenne yellow ; 
B 
