632 SEERICOKNIA. 



size, black colour, very shining and almost glabrous surface, and short thorax. The 

 legs vary in colour. The elytra are confusedly punctured, without trace of striee, a 

 short sutural one at the base excepted. The pubescence is easily abraded, and 

 only visible on the thorax in fresh specimens, that on the under surface being more 

 distinct. P. ebenina is much smaller than P. corvina, and has very much shorter and 

 more slender antennae, the thorax and elytra more narrowly margined, the scutellum 

 with a narrow, well-defined median sulcus, &c. 



5. Ptilodactyla glabrata. 



$ . Moderately long, elliptic, rather broad, convex, shining, almost glabrous ; testaceous-brown, the antennae 

 testaceous, with the eighth and ninth joints slightly infuscate, the eyes black, the legs testaceous. Head 

 broad, sparsely, finely punctate, the eyes prominent and moderately large ; antennae rather slender, about 

 as long as the elytra, the joints from the fourth very gradually widening and becoming more distinctly 

 serrate, 3 elongate, 4-10 slightly shorter and subequal in length. Prothorax short, transversely convex 

 in front, explanate at the sides behind and compressed laterally towards the apex, the latter appearing 

 subtruncate as viewed from above, the sides acutely margined and arcuately converging almost from the 

 base ; the base trisinuate, denticulate ; the hind angles acute and directed backwards ; the surface 

 sparsely, extremely minutely punctate. Scutellum deeply notched in the centre in front and with a 

 shallow median sulcus extending thence to near the apex. Elytra moderately elongate, a little rounded 

 at the sides, widest at the middle, acutely margined at the sides ; rather coarsely punctate-striate, the 

 punctures becoming coarser towards the sides, the first (sutural) and fifth (humeral), however, very deeply 

 impressed at the base ; the interstices feebly convex, flat at the apex, and sparsely, minutely punctate. 



Length 6g, breadth 3 millim. 



Hah Costa Eica, Volcan de Irazu 6000 feet (Rogers). 



One example. Larger, longer, and less parallel than P. nigricornis, the thorax 

 compressed laterally in front, the antenna? pale (the eight and ninth joints excepted), 

 the elytra punctate-striate, &c. There are traces of fine pubescence on the thorax. 



6. Ptilodactyla SUbstriata. (Tab. XXVII. figg. 16, 6 ; 16 a, antenna.) 



3 . Oblong-elliptic, flattened above, very shining ; above almost glabrous, beneath sparsely and finely 

 pubescent ; black or pitchy-black, the antennas piceous, becoming brownish towards the tip, the apical 

 joint testaceous, the femora and tarsi testaceous, the tibiae brownish. Head sparsely, finely punctate, the 

 eyes moderately large; antennae stout, not so long as the body, the joints from the fourth slightly 

 rounded on their outer edge, 4-10 each with a comparatively short ramus, the outer rami very little 

 longer than the joints themselves, the eleventh joint stout. Prothorax short, transversely convex in 

 front, sharply margined at the sides, the latter rounded and converging from a little before the base, the 

 hind angles acute ; the base trisinuate, denticulate, and with a projecting tooth in the centre ; the surface 

 extremely minutely, very sparsely punctate. Scutellum distinctly punctured, very deeply notched in the 

 middle in front, and with a deep sulcus extending thence to the apex. Elytra moderately long, feebly 

 rounded and sharply margined at the sides, widest at the middle, flattened on the disc, the latter broadly 

 transversely depressed at about one-fourth from the base ; finely, rather sparsely punctate, the disc with 

 indications of obsolete impunctate striae, the first and fifth deeply impressed at the base. Beneath 

 sparsely and more coarsely punctured than above, the ventral segments somewhat closely punctate. 

 Eifth ventral segment arcuate-emarginate at the apex. 



Length 4^-4^, breadth 2 millim. 



Hah. Costa Eica, Volcan de Irazu 6000 to 7000 feet (Rogers). 



