Silusa.] STAPiirLiNiD.E. 163 



SIIiUSA, Ei-iclison. 



Dr. Sharp has lately described eight new species of this genus from 

 Central America, but until recently it has only contained ten species, one 

 or two of these occurring in Europe, and the rest being very widely 

 distributed, occurring in Xorth America, Chili, Ceylon, New Guinea, and 

 Australia ; they are ibund under bark^ at sap, &c, 



S> rubig-inosa, Er. (rufiila, Mots.). Rather shiny, pitch-black, 

 with the elytra and apex of hind body reddish brown, the region round 

 scutelkim and posterior angles being sometimes darker ; head much 

 narrower than thorax, antennae as long as head and thorax together, 

 gradually thickened towards apex, ferruginous with base lighter, 

 penultimate joints gradually more strongly tmnsverse, last joint rather 

 longer than the two preceding together ; thorax broader than long, as 

 broad at base as elytra, with sides plainly and regularly rounded, finely 

 and thickly punctured ; elytra longer and more strongly punctured than 

 thorax ; hind body parallel-sided, closely punctured at base, more 

 sparingly behind. L, 3-3| mm. 



Male with the suture of elytra raised at apex ; sixth segment of hind 

 body furnished with a longitudinal keel, seventh nearly hidden, finely 

 and obsoletely crenulate on apical margin. 



At sap, especially of Cossus-infected trees, also under bark ; local ; Loudon district, 

 uot rare; Duhvich, Putney, Mickleham, Tooting, Hanwell(bark-of elm trees), Cowley; 

 Toubi-idge; VVraxall, Norfolk; Winchester; Cambridge; Dean Forest; Ockbrook, 

 near Derby : it has not occurred in any locality in the north of England or in Scotland. 



ACTOCHARZS, Janson. 



The very anomalous insect that forms this genus is very rare, and its 

 position is very doubtful : the bifid ligula and swollen third and subulate 

 apical joint of its maxillary palpi are very peculiar characters, the latter 

 connecting it with Eiidectus and Coryj^ihium, with which, however, it 

 has little in common, although in the catalogue of Heyden, Reitter, and 

 Weise it is located not so very far from them between Anci/ro/jhorus 

 and Comjjsochiliis ; in the elongate lobes of its maxillae it clearly 

 approaches Myllmna, and in its palpi Gyrophcena ; on the whole the 

 position near Silusa, with which it has several points in common as regards 

 the structure of the mouth organs, seems as good as any that can be 

 adopted 



A. Readlng-ii, Sharp (marina, Fauvel). Elongate, linear, depressed, 

 very narrow ; reddish testaceous, with hind body except apex fuscous ; 

 head elongate, 'with eyes small, not prominent, and unicolorous with head, 

 antennae testaceous, moderately long and stout, with joints 3-10 some- 

 what transverse, the third joint smaller than the others; thorax not 

 transverse, narrowed toward.s base ; elytra shorter than thorax ; hintl 



M 2 



