332 ENTOMOLOGICAL SOCIETY 



tracha I describe here is the most wonderful form known till 

 now, standing quite alone in the genus. 



Tetracha (Phseoxantha) klugi Chd. 



One specimen only. Attracted by the light in the tent at Ciu- 

 dad Bolivar in early June. 



Tetracha (Phaeoxantha) aequinoctialis Dej. 



This very active beetle, whose ground color is like the sand 

 upon which it is found, was taken along the margin of a stream 

 near Ciudad Bolivar during May, June, and November. The 

 elytra are less punctured than in the Amazonian specimens, and 

 the vertex is yellow-brown. I cannot distinguish this species 

 from T. bifasciata Brll., which I consider but a variety of the 

 former. 



Tetracha klagesi, sp. nov. 



Species mirabilis valde singularis, novam sectionem in genere consti- 

 tuens ! 



Tetr, oxychtloidi m. paullulum affinis, valde major tota cjanea ; pectoris 

 medio abdominisque apice nigricantibus ; capite minore, fronte prono- 

 toque subtilissime alutaceis (opacis), impressionibus 2 interocularibus 

 (discoidalibus) levissimis ; mandibulis et labro nigris, hoc paullo latiore 

 antice recte truncate bidentato, dentibus brevibus ; antennis valde longiori- 

 bus, sed brevioribus quam in Phaeoxanthse specibus, articulis 4 primis 

 nigris. Prothorace longiore angustioreque quam in Ph. cequznoctiali 

 Dej., angulis anticis paullo minus productis, sulcis pronotalibus profun- 

 dioribus (levioribus quam in Tetr, oxychiloidi m.) fereut in /*/&. crnciata 

 Brll. margine laterali ipso breviter reflexo (non serrulate), prothorace 

 pone sulcum apicalem et ante sulcum basalem magis constricto (ut margo 

 magis sinuatus videatur) quam in Ph. czquinoctiali Dej., angulis posticis 

 applanato-rotundatis magisque prominulis. Eljtris fere ut in T. oxychi- 

 Zoidtm., marginem versus pauilo minus declivibus, crista marginali (quinta 

 parte humerali et apicali excepta) sat late applanato-reflexa, apice singulo 

 paullo magis prolongato sed latius rotundato-truncato, humeris minus 

 prominulis, superficie totaimmaculata modice splendente, densius sculpta, 

 epipleuris convexioribus ; impressionibus anteapicalibus elytrorum valde 

 evidentioribus anticemque versus prolongatis. Pedibus longioribus ; tro- 

 chanteribus femoribusque rufo-brunnescentibus, horum apice modice late 

 nigro-annulato; tibiis testaceis (subtus nigro aut brunneo lineatis : ex- 

 tremo apice basique angustissime obscuratis); tarsis brunneo-nigricanti- 

 bus, articulis hinc inde praesertium maxima parte superficiei articuli 

 primi dilutioribus ; palpis testaceis. Long. 20-22 mm., sine labro. 



i 9 , c?c?. This regal species occurs in the Parima Mountains, 

 and was discovered running along the borders of a small stream 

 at dusk. It runs in a zigzag course with marvelous rapidity 

 exceeding that of its nearest kin and makes its appearance only 

 after sunset. Found in May and early June at an elevation of 



