VOLUME 55, NUMBER 1 
59 
narrow, curved ridges; deeply depressed between ridges and elevations 
and along borders. 
Mesonotum. —Wide and short (35:95), medially produced backward into 
long, scutellum-like, rhomboidal plate; the latter with a double median Ca¬ 
rina, not reaching fore border and obliterated posteriorly; all borders of 
rhomboidal plate carinate; disc, laterad of rhomboidal plate, with 6 (3 + 3) 
oblique elevations and 2(1 + 1) sublateral carinae. 
Metanotum. —Separated into two large, uneven plates, separated from 
mesonotum by deep, and from tergum I and connexivum II by thin, sulci. 
Lateral borders almost straight, slightly diverging backward and terminating 
into 2(1 + 1) small, angular processes. 
Abdomen .—Longer than its maximum width across segment V (165:135) 
with rounded lateral borders from II to V, produced backward into 2(1 + 
1) large, flat, rounded lobes on VII. 2(1 + 1) acute, flat paratergites placed 
at lower level than connexiva VII. Segment IX tricuspidate placed lower 
than paratergites. Terga I and II separated from metanotum and from each 
other by thin, transverse sulci, and from central dorsal plate by a deeper 
sulcus. Central dorsal plate consisting of segments III to VI, is subrectan- 
gular, with slightly convex borders and rather flat. Median ridge is wide and 
flat, acute anteriorly and truncate posteriorly, flanked by 2 (1 + 1) rows of 
larger, and by 2 (1 + 1) rows of smaller, round callous spots, each surround¬ 
ed with carinate borders. Tergum VII raised and then depressed medially. 
Connexiva flat, each with 2 (one larger and one smaller) round, callous spots 
along inner borders. Connexiva II and III semifused together. Posteroex- 
terior angles of connexiva II not protruding, III to VI progressively more 
protruding, VII, as was said, produced into large, rounded lobes. Spiracles 
II to VII ventral, placed far from border, VIII lateral and visible from 
above. Metathoracic scent gland opening long and moderately gaping, 
slightly visible from above. 
Prosternum .—With inverted “T”-shaped median ridge. Meso- and meta¬ 
sternum flat. 
Legs. —Trochanters free; femora and tibiae cylindrical, unarmed; tarsi 
with bristle-like arolias. 
Color .—Black; labium and tarsi at base, yellow brown. 
Total length 12.80 mm; width of pronotum 3.00 mm; width of abdomen 
5.40 mm. 
Holotype 9 , Kenya, Wundanyi, Teita Hills, 1450 m, 1.XI.1957, E. S. 
Ross & R. E. Leech leg.; deposited at California Academy of Sciences, San 
Francisco. 
It is a pleasure to dedicate this striking species to Dr. Paul H. Ar- 
naud, Jr. 
Usumbaraia arnaudi is more related to U. elongata Kormilev 1956, but 
may be separated from it by the longer and more cleft genae, produced 
