498 ON CARABID.I-: FROM WEST AUSTRALIA, 



The collection contains eighteen specimens of a species of 

 Trigonothops (the largest species of the genus), of a general 

 brownish colour, which, though a little larger than Plnchionux 

 humeraHs, Macl., agrees too closely with the description of that 

 species to be regarded as different, though a comparison with the 

 type might possibly show it to lie another species. 



Its coloration may be described as follows : — Head reddish ; 

 prothorax reddish-brown, disc piceous; pattern of elytra similar 

 to that of T. Jongiplaga., Chaud., — lateral margin testaceous, ninth 

 interstice brownish, first, sixth, seventh, and eighth interstices 

 piceous-black (the black uniting at apical third), second, third and 

 fourth interstices brownish on anterior two-thirds, apex brownish, 

 clouded with piceous. The third interstice of the elytra is 

 bipunctate near second stria (excluding a puncture at apical 

 extremity); the anterior puncture found in T. pacijjca, Erichs., 

 near the third stria, is wanting. The posterior tarsi have the 

 fourth joint smaller than in 7'. pacifica, and not spongiose 

 beneath in both sexes as in that species. Length 9 -5-1 0-5 mm. 



Hah. — Rottnest Island, Geraldton and MuUewa (Lea). 



109. T. LONGiPLAGA, Chaud. ; I.e. Sp. 106. Hab. — Rottnest 

 Island (Lea\ 



110. T. occiDENTALis, Blkb., P.L.S.N.S.W. (2), vii. 1892, p. 66. 

 Hab. — Mount Barker (Lea). 



Genus Ectroma. 



The Rev. T. Blackburn when founding this genus did not 

 diagnose it beyond noting a few differences and resemblances 

 between it and Sarothrocrepis. The differences he gives are 

 as follows : — " differs from Sarotltrucv-pis by the intermediate 

 tarsi in the male not dilated nor bearing (except on the apical 

 joint) a dense clothing of hairs beneath, by the shorter labrum, 

 the apical joint of the labial palpi not ' compressed, dilated and 

 truncate at the apex,' and the ligula longer as compared with its 

 paraglossjB."* None of these differences has seemed to me suitable 

 for tabulating purposes. 



* P.L.S.N.S.W. (2j, iv. 1SS9, p. 711. 



