1S93.] 257 



insertce. Coxce anterior es vel contiguce vel parum distant es ; processu jpro- 

 sternal'i post eas extenso ; memhrana lasalis pone processum Integra. Coxce 

 posteriores perparum distantes. Tibiae apice externa angulatim prominulo. 



The subfamily Las some points of resemblance with Nemafidium, 

 which is another of the excessively elongate Colydii, and that no 

 doubt, like the Gempylodlni, enter the burrows of wood-boring insects 

 to prey on their inhabitants, but in Nematidium we meet with a 

 different form of antennae, whose insertion also is quite distinct ; 

 while the globular front coxae are covered by the prosternal process ; 

 the basal membrane of the QempyJodini being absent. Nematidium 

 will have to form a separate subfamily or tribe, possessing affinities 

 with the Deretaphrini. 



MECEDAisruM Eeichsoni, n. sp. 



J^alde elongatum, nigrum, opacum, antennis pedihusqiie piceis ; fortiter 



scul pturatum , prothorace medio latins longitudinaliter impresso ; elytris 



suhtiliter costatis, interstitiis foveolis biseriatim ornatis. 



Xiong., 10 mm. ; lat., 1 mm. 



Antennae with all the joints stout, the 4th to the 10th transverse, the 11th very- 

 large, rounded at tlie apex, its inner edge very slightly emarginate. Head with 

 rounded epistonie, and strongly raised lateral carina, its disc slightly raised and 

 shining, vertex much punctate. Thorax nearly three times as long as broad ; the 

 lateral margin very fine ; the surface dull, coarsely and closely punctate, with a deep, 

 very broad, groove extending from front to base. Scutellum extremely narrow, 

 hastate. Elytra with feeble costse, which are somewhat more strongly raised behind, 

 and whose summits are rendered rather irregular by the insertions of a few very 

 distinct minute setae ; the intervals of the costse have a very coarse biserial sculp- 

 ture ; the apices of the elytra are so formed as to leave a deep common notch at 

 the apex. 



The only example I have seen was found in Madagascar, in the 

 Betsileo district, by Mr. Cowan. 



Cambridge : Septemler Wth, 1893. 



P.S. — Since the above was written, I have seen in Mr. Fry's col- 

 lection an insect having the appearance of Gempylodes, but forming a 

 quite distinct genus, having well-marked antennal grooves extending 

 between the base of the maxillae and the eyes. This is probably the 

 genus Jprostoma, of Guerin. This genus was described in 1839, and 

 referred to the BrentJiidce ! Westwood, however, in the " Transactions 

 of the Entomological Society of London" for 1869 described briefly a 

 second species, and remarked that it was a member of the Golydiidce, 

 and not of the Brenthidce. 



Eeitter, in the " Deutsche Ent. Zeit.," 1878, p. 120, speaking of 

 AiJrostoma, puts in a bracket after this name " Mecedanum, Erichs.," 



