EXPEDITION TO SOKOTRA : NEW SPECIES. 9 
medium prothoracis vix superantibus, articulo 3° quam 2° sesqui-longiore, 
articulo 4° quam 2° vix breviore. Long. 74-84, lat. (ad med.elytrorum) 
3}-35 mm. 
Habitat. Sokotra: Homhil, East Sokotra (alt. 1500-3000 ft.). 
Head densely punctulate, antennz scarcely reaching beyond the middle 
of the pronotum, with the third joint about half as long again as the second, 
the fourth appreciably shorter than the second, the fifth and following joints 
gradually and but very slightly decreasing in length, and the eleventh 
narrower than the tenth. Prothorax densely and minutely punctulate, 
slightly rounded at the sides, widest a little in front of the middle, and 
thence narrowed to the base and apex, being a little narrower across the 
apex than at the base, where the width is almost equal to the length of the 
pronotum along the middle. Elytra ovate, about two and a half times as 
long as the pronotum, finely and rather sparsely punctulate, and each 
impressed along the disk with five or six shallow and nearly obsolete 
grooves. 
(5) Rhytidonota socia. 
Precedenti similis et affinis, sed antennis longioribus, minus dense 
punctulatis, basin prothoracis attingentibus, prothorace lateraliter minus 
rotundato, ad basin quam longitudine paullulo latiore. 
Habitat. Sokotra: Adho Dimellus (alt. 5500-4500 ft.). 
This species has the same dull black colour as the preceding species, which 
it closely resembles also in size and shape. It differs from it as follows :— 
the antenne are longer, reaching quite to the base of the pronotum, less 
closely punctulate, and with the second joint relatively shorter, being less in 
length than the fourth joint and little more than half as long as the third ; 
the pronotum is more parallel-sided, and its width. across the base is a little 
greater than its length along the middle. 
(6) Rhytidonota (!) tibialis. 
Capite prothoraceque confertissime sub-rugosoque punctatis ; prothorace 
quam latitudine maxima (ante medium posita) paullo longiore, lateribus ante 
medium paullo rotundatis, deinde versus basin convergentibus ; elytris ovatis, 
utrisque longitudinaliter 10-costatis intervallis transversim sub-rugosis et 
inequaliter punctatis ; prosterno pone coxas anticas deflexo et ad extremitatem 
horizontaliter directo ; tibiis extus sulcatis ; antennis basin prothoracis fere 
attingentibus, articulo 2° quam 3° paullo breviore, et quam 4° paullo longiore, 
articulo 4° ad 8™ gradatim brevioribus, 9° ad 11"™ brevibus. Long. 11-12, 
lat. (ad med. elytrorum) 4-4.2 mm. 
Habitat. Abd-el-Kuri. 
This species is very distinct from the two preceding ; and, in certain of 
its characters, such as the form of the prosternal process, and the presence of 
a groove along the outer (or dorsal) face of each of the tibiz, it differs from 
all other known species of /hytidonota. 
(7) Eusyntelia opacicollis. 
E. cbenine (Waterh.) proxime aftinis; capite prothoraceque dense sat 
fortiter punctulatis et opacis, pronoto quam latitudine basis paullo longiore ; 
elytris sulcatis, interstitiis convexis sat dense punctulatis vix nitidis ; antennis 
basin prothoracis paullulo superantibus, articulo 3° quam 2° duplo longiore. 
Long. 12-15, lat. (ad med. elytrorum) 43-6 mm. 
Habitat. Sokotra: Jena-agahan (alt. 1200 ft.), and Hadibu Plain. 
