THE COLTDIID^ OF JAPAN, 83 



Head retractile, palpi small, slender, terminal joint extremely- 

 slender, acuminate ; eyes minute, but very prominent. Presternum 

 witli a chin-piece in the middle, to which the retracted head is 

 quite closely applied, so that the mouth is entirely covered ; the 

 vphole of the side of the thorax beneath, from near the front to 

 the hind angle, is excavated, forming a very large cavity in vs^hich 

 the retracted antenna can move freely; this excavation extends 

 to the upper surface of the thorax, which bears two quite trans- 

 parent spaces, admitting light to the interior o£ the antennal 

 cave. The minute front coxse are a little separated by a small 

 process little dissimilar from that of Cerylon. Middle coxae more 

 widely separated than the anterior ; posterior widely distant as 

 in Cerylon ; first ventral segment large, as long in the middle as 

 the three following together, division between the fourth and 

 fifth segments rather obscure. Tibiae simple ; tarsi with the three 

 basal joints minute. 



The extraordinary structure of the thorax is sufficient to 

 distinguish this insect from all others we yet know, the whole of 

 each side of the thorax forming a cave, lighted by two windows 

 above, in which the antennae can move about. Except for this 

 peculiarity, I do not see anything which should militate against the 

 placing of the genus in the Cerylonini, for although the antennae 

 are apparently only eight- jointed, yet their structure is similar 

 to that o£ Cerylon, except for the disappearance of two of the 

 small intermediate joints, a . character which is perhaps not of 

 very great importance. 



Thtrodeeus poecatus, n. sp. (Plate III. fig. 11.) 

 Anguste oblongus, convexus, fusco-rufus, opacus, dense punctatus, 

 setulis brevissimis parce adspersus ; prothorace utrinque prope marginem 

 lateralem oblique bi-impresso ; antennis pedibusque rufo-testaceis. Long. 

 I5 millira. 



Antennae short, basal joint large, second smaller, almost 

 spherical, the following five all minute, the eighth forming a 

 rather large, shortly oval club. Head deflexed ; eyes minute. 

 Thorax rather broader than long, a little rounded at the sides, 

 and a good deal narrowed in front, very convex transversely ; 

 rough, being extremely densely punctured, and bearing very 

 minute upright setae, with a broad lateral margin, near which are 

 two curvate impressions, the posterior being the longer, and 

 extending nearly to the base of the thorax. Elytra coarsely 



