170 Mr. II. W. Bates's additions to the 



Icptus, which he says is a true 12th joint. I had given 

 the antennre as 11th joint appendiculated. In well- 

 developed males of M. comis this joint is nearly as long 

 as the 11th, and of great tenuity ; in the female it forms 

 a short conical appendage to the 11th. 



The much longer and narrower anterior part of the 

 head can alone scarcely warrant the generic separation 

 of the present species from Metaleptus. 



Teiacetelus, nov. gen. 



Metalepto (Bates) affinis sed thorace oblongo lateribus acute 

 spinosis etc. certe distinctus. Corpus sat anguste elongatum, sericeo- 

 pubescens, opacus. Caput ante oculos paullo magis quam iu 

 M. angulato elongatum. Antennas tenues {g-), corpore magis quam 

 duplo longiores, 12 articulatte, scapo brevi fortiter clavato, articulis 

 3 — 10 et 12 longitudine fere sequalibus, 11 cajteris longiori, 3 — 6 

 apice paullo incrassatis. Elytra postice sensim paullo angustata, 

 disco obtusissime costato, apice utrinque tridentato dente inter- 

 media longiori et validiori. Pedes valde elongati ; femora postica 

 linearia ad apicem bidentata, tarsi postici articulo Imo valde elon- 

 gate. Mesosternum in medio tuberculatum. Metasterni episterna 

 lata et valde elongata. 



A distinct generic form, nearest allied to Metaleptus, 

 of all genera known to me ; but the mandibles are de- 

 cidedly more obtuse and chisel-shaped at the apex than 

 in that genus, though in M. comis they are by no means 

 distinctly pointed. 



Triacetelus sericatus, n. sp. (PI. VII., fig. 12, <?). 

 Fusco-niger, pcctore aincsconti, elytris cinnamomeo-fulvis, an- 

 tennis rufo-obscuris pedibusque laste rufis, thorace antennis cor- 

 poreque subtus decumbenti-griseo-sericeo pilosis. Caput fronte 

 declivi impunctata, vertice grosse sparsim occipite dense et sub- 

 tilius, punctatis. Thorax sat elongato-oblongus, in medio paullo 

 dilatatus et acute spinosus antice recte postice sinuatim et minus, 

 angustatus, pubcscentia utrinque transversim dccumbenti, linea 

 dorsali interdum Levi punctata. Elytra plerumque transversim 

 decumbenti-pilosa. Vcntris scgmento apicali rufo. Long. 14 — 

 17 millim., g. 



Hah. Mexico, Iguala in Guerrero (Tloge). Four 

 examples, all males. 



