1881.] COLEOPTERA OF SOCOTRA. 475 



postice payuni angustato, lateribus post mediain fere rectis ; 

 elytris sulcatis, fere lavibus. 



Long. 7h lii- 



This species is very close to the preceding, but is at once distin- 

 guished by the thorax being rather narrower, more convex in front, 

 rather more narrowed behind, and the sides, instead of behig regu- 

 larly arcuate, are somewhat rectilinear behind the middle. The 

 antennae are rather longer. The head is more delicately punctured ; 

 and there are no longitudinal impressed lines on the forehead. The 

 thorax is almost entirely smooth, a few excessively fine punctures 

 being visible near the posterior angles. The punctures on the pos- 

 terior tibise are finer, and distinctly separated from each other. 



This species so closely resembles S. balfouri in all its general 

 characters and appearance, that it occurred to me that the differences 

 might, perhaps, be sexual ; this, however, I have, by dissection, 

 proved not to be the case. 



8. EUSYNTELIA GLABRA, n. sp. (Plate XLIII. fig. 6.) 



Nigra, nitida, convexiuscula ; capite crebre evidenter punctulato, 

 thorace creberrime suhtiliter punctulato ; ehjtris striis obtusis 

 perparum impressis, interstitiis parwn convexis, fere Icevibus. 



Long. 5g lin. 



Elongate-ovate, moderately convex, glabrous. Antenna) mode- 

 rately short, shining, not very thickly but very finely punctured. 

 Head moderately thickly and very distinctly punctured ; the ocular 

 ridge moderately strong ; the projection in the middle of the margin 

 of the clypeus rather small and acute. Thorax nearly twice as 

 broad as the head, about one fifth broader than long, a very little 

 more narrowed in front than behind, gently convex ; finely margined 

 all round (except, perhaps, in the middle of the anterior margin) ; 

 very finely and rather closely punctured and evenly so all over ; the 

 anterior angles moderately prominent ; the sides moderately and 

 perfectly evenly arcuate ; the posterior angles are rather greater 

 than right angles (about 1 20°) ; the base is broadly and gently lobed 

 in the middle. Elytra about one quarter longer than the head and 

 thorax together, rather convex, a little flatter on the back ; at the 

 base a very little broader than the base of the thorax, gradually and 

 evenly enlarged to the middle (where their width is equal to the 

 length of the head and thorax together), then narrowed again to the 

 apex, which is very slightly produced ; each elytron has four or five 

 rather obscure impressed channels (obsolete at the base); the second, 

 third, and fourth interstices are very gently convex ; the punctua- 

 tion, although not sparse, is very fine and obscure, and in parts 

 scarcely visible. 



9. Adelostoma bicarinatum, n. sp. (Plate XLIII. fig. 3.) 



Subparallelum, depressum, yriseo-nigrum, opacum, ruc/osum; 

 thorace dorso carinis duabus distantibus; elijtris sinyuUs 

 costis tribtis, carina secunda bast apiceqtie ahbreoiata. 



Long. 2^ lin. 



31* 



