9fi ' [April. 



punctate. Head rather broad, slightly depressed on eacli side anteriorly, the 

 eyes large ; antennae moderately long, not very slender, joints 2 and 3 short, 

 equal, 4-11 slightly deci-easing in length. Prothorax very short, rH])idlv 

 narrowing from the base, bi>inuate in front, the lateral margins e.xplanate. 

 Klytra li>ng, compressed at the sides below the humeri, depressed along tlu* 

 suture to about the middle, r«»unded at the tip, and with flattened expanded 

 margins. Posterior coxae without plate. Legs raoderateh' long; posterior 

 tibiae compressed, feebly curved, the long upper spur much shorter than tin- 

 tirst tarsal joint. 



Length (excl. head) 4|, breadth 2| mm. 



Hah. British Guiana {A. W. Bavtleti). 



The single specimen seen, received by the Museum in 1909, has the 

 prothorax crushed on the right side, but in other resiiects it is in good 

 condition. An elongate, depressed, sharply maculate insect, bearing an 

 extraordinary resemblance to various Tropical American Halticids. Its 

 nearest known ally, O. troherti Guer. (= chevrolafi Clark), from 

 Mexico, etc.,* has a broader head and prothorax, and the head, antennae, 

 elytra, and legs very difPerentlj' coloured. In the present species the 

 elytra have a broad, sinuate, exteriorly triradiate vitta on the disc, 

 the outer margin, and suture in part, flavous and the rest of their 

 surface black. 



2. — Or a complanata. 



? Sci/rtes complanatus Guer. Rev. Zool. 1861, p. 544. 

 Ora complanata Pic, in Junk's Col. Cat. p. 39 (1914). 



Broad, oval, depressed, shining, closely pubescent; testaceous, the eyes 

 black, the antennae (joints 1-3 excepted) piceous, the elytra (except along 

 the dilated margin) suffused with red to near the apex ; densel}', extremely 

 minutely punctate, the prothorax much smoother, the elytra with distinct 

 scattered coarser punctures intermixed. Head rather small, excavate on each 

 side near the eyes anteriorly, the latter large ; antennae moderately long, not 

 very slender, joints 2 and 3 short, equal. Prothorax short, rapidly, obliquely 

 narrowed from the base, explanate laterally, bisinuate in front, the anterior 

 angles prominent. Elytra rounded at the sides and somewhat acuminate at 

 the tip, distinctl}' striate near the suture, the margins explanate. Posterior 

 coxae without plate. Posterior legs very long, the tibiae C(jm pressed and 

 sharply carinate, the upper spur nearly as long as the elongated tirst tarsal 

 joint. 



Length 4, breadth 21 mm. 



Hah. Brazil [type] ; Amazons, Tunantins {Trail). 



The above description is taken from the Tunantins specimen (received 

 by the Museum in 1897), which is in very good condition. Guerin's 



* There ia an example of this species in the Museum labelled " Brazil," posoibly in error. 



