1907.] SPECIES OF CRYPTOC'EPlfALIXE BEETLES. 841 



any other Central -American CJryptocephalus with which I am 

 acquainted. 



Oryptocephalus guianaensis, sp. n. 



Pale flavous ; antenna? (the basal joints excepted) black ; head 

 coarsely punctured ; thorax with a very deep, foveolate sulcus at 

 each side, impunctate ; elytra deeply and closely punctured, with 

 rugose and costate interstices. 



Length 5 millim. 



Elongate and pai'allel, the head with a row of punctures near 

 the eyes, rest impunctate ; eyes deeply subquadrately emarginate 

 at middle, rather closely approached at the vertex ; antennfe 

 extending beyond the middle of tlie elytra, black, the lower three 

 joints flavous, third and fom^th joints equal, fifth as long as the 

 preceding two together, the following nearly equally long and 

 thickened. Thorax quite twice as broad as long ; the sides less 

 strongly deflexed than in most species ; lateral margins nearly 

 straight, moderately strongh^ narrowed in front ; surface impunc- 

 tate and shining, flavous ; fi-om the middle of the lateral margins 

 runs a deep, sinuate sulcus to the base in front of the scutellum, 

 at the middle this sulcus is widened into a fovea, the space which 

 lies behind is strongly raised, especially so near the posterior 

 angles ; in front of the scutellum this sulcus ends in another 

 fovea. Scutellum narrow and elongate, almost subcylindrical. 

 Elytra convex, very slightly narrowed posteriorly, with rows of 

 deep, foveolate punctures, extremely closely placed and almost 

 confluent, the interstices transversely rugose and longitudinally 

 costate, the punctures neai- the apex finer and more separated. 

 Legs elongate, flavous. Presternum broadly subquadi-ate, strongly 

 produced in front, base feebly emarginate. 



Hah. British Guiana. 



I know no other South-American Oryptocephalus with an 

 equally deeply sulcate thorax or similar elytral sculpture. 



Oryptocephalus gundlachi, sp. n. 



2 . Purplish blue ; thorax finely punctui'ed with wrinkled 

 interstices ; elytra strongly punctate-striate, a transverse band at 

 base ; the sides below the shoulders and the apex flavous. 



Length 5 millim. 



Of broad and somewhat flattened shape ; the head strongly and 

 rather closely punctured, purplish blue ; labrum and mandibles 

 black; antennse purplish, lower three joints more or less fidvous 

 below, fifth and following joints very elongate, longer than fourth. 

 Thorax more than twice as broad as long, not much narrowed 

 anteriorly, the sides rounded, posterior angles produced ; the entire 

 surface finely wrinkled, sparingly and very finely punctured ; 

 median lobe very short, scarcely produced. Scutellum black, 

 oblong, impunctate. Elytra strongly punctate-striate anteriorly, 

 finely so towards the apex, the rows widely separated ; the inter- 

 stices very finely wi-inkled,. with a transverse smooth i-aised space 



