370 Dr. D. Sharp on 



of Tachyusa^ appears to be a valid one, and we have two 

 species of it in Japan. Fauvel thinks it the same as Myrme- 

 coj>ora, Saulcy, but this appears to me very doubtful. T. al- 

 garum is also a Xenusa. 



EcTOLABRUS, nov. gen. 



Corpus sat latum, posterius acuminatum, fortiter punetatum, pubes- 

 cens, thoraco transverse, anterius rotundato, posterius bisinuato. 

 Antennae sat graciles, laxe articulatse. Palpi maxillares articulo 

 ultimo sat elongato, gracillimo, pra3cedente gracili, latitudine plus 

 duplo longiore. Gense marginatte. Prosternum brevissimum. 

 Coxse intermediae subcoutiguoe, mesosterno inter eas processum 

 elongatum tcnue, tenuiter carinatum formante. Pedes graciles ; 

 tarsi anteriores 4-articulati, intermedii et posteriores 5-articulati ; 

 posteriorum articulo basali secundo baud duplo lougiore. 



""J^he insect for which I establish this genus is in appear- 

 ance somewhat intermediate between Hommusa and Dinarda. 

 None of the examples brought back by Mr. Lewis are in good 

 preservation, and the structure of the tarsi has not been very 

 clearly perceived by me ; but I feel pretty sure that the inter- 

 mediate feet are five-jointed. 



EctoJahrus laticollis, n. sp. 



Fusco-niger, baud nitidus, protboracis marginibus elytrisque ferru- 

 giueis ; antenuarum basi pedibusque rutis ; fortiter punctatus ; 

 tborace valde transverso, elytris paulo latiore, angulis posteriori- 

 bus acutis. 



Long. 4 millim. 



Antennae with the three basal joints yellow, the others 

 darker ; third joint a little longer than second, fourth to tenth 

 each a little broader than its predecessor, the fourth longer 

 than broad, seventh to tenth each transverse. Head broad 

 and short, scarcely half as broad as the thorax, closely and 

 coarsely punctate. Thorax twice as broad as long, sides 

 rounded and narrowed in front, the base rounded in the 

 middle, nearly concealing the scutellum, the hind angles 

 slightly acute, the surface closely and coarsely punctate, with 

 a vague depression in front of the base in the middle. Elytra 

 a little longer than the thorax, roughly punctate, liind margin 

 deeply sinuate on each side. Hind body acuminate behind, 

 moderately closely punctate and pubescent, beneath densely 

 pubescent. 



Miyanoshita and Nikko ; main island. 



