202 EEVISIOXAL NOTES ON AUSTRALIAN CARABIUAK, 



Tachys helmsi Sloane (1898). 



Uab. — W. A.: Upper Ord River (Helms); Queensland: Upper Normanby 

 River (Sloane). East Indian Islands. 



I have no note of the circumstances under which I found this species. A 

 specimen from some locality in the East Indies, which I cannot decipher, was 

 among the duplicates of the Van de Poll Collection. 



Tachys ovensensis Blackburn (18H0). 



Hab. — Victoria: Ovens, Goulburn and Varra Rivere. 1 found it in Decem- 

 ber at Janiieson on pebble beds at the margin of the Goulburn River. 



Tachys tlavicornis, n.sp. 



Oval, convex. Head with short duplicated frontal sulci; prothorax of equal 

 width at base and apex, basal angles rectangular, a short submarginal carina on 

 each side of base; elytra bistriate on each side of suture, eighth stria strongly 

 impressed, apical striole well developed, ninth interstice convex, disc bipunctate 

 outside second stria. Head and prothorax polished brown ; elytra nitid, pieeous, 

 with wide humeral and ante-apical yellowish maculae; legs, antennae, and palpi 

 testaceous. 



Head wide; frontal sulci not crossing clypeus, extending backward to level 

 with anterior supi'a-orbital seta; eyes prominent, hemispherical. Prothorax 

 transvei-sely subcordate; sides rounded on anterior two-thirds, evidently narrowed 

 and shortly subsinuate to base; lateral channel wide; border wide, reflexed; 

 lateral basal impressions deep, connected by a well-marked transverse impres- 

 sion; space between basal impression and lateral channel forming a short carina 

 extending to basal angle on each side. Elytra oval, convex; shoulders ampliate, 

 rounded; base with a deep fovea on each side of peduncle; first stria extending 

 to apex, not reaching base, second stria abbreviated anteriorly and posteriorly. 

 Length, 2.5; breadth, 1.0. 



Hab. — Queensland: Cooktown District (Sloane), Townsville (Dodd). I 

 found this species, in July, on the sandy margins of pools in the Laura River, 

 and beside a pool with sandy margins in the course of a rivulet near Helen- 

 vale, 16 miles south of Cooktown. 



T. flavicornis is not closely allied to any other Australian species; its af- 

 finity is to T. deUciolus Bates (which I have from Java, Suml)awa, and New 

 Guinea), but it differs by antennae wholly testaceous; prothorax more trans- 

 verse, more strongly rounded on sides, more sinuate posteriorly, wider across 

 base, marginal channel wider; elytra wider, especially at base, first stria not 

 reaching base, light-coloured basal maculae overspreading more of the elytra. 



Note. — 7'. nietneri Bates (^T. ornaUts Nietner), wliich is unknown to me 

 in nature, seems the only closely allied Oiiental species with the antennae wholly 

 testaceous; it cannot be said to be described, but Nietner's note on it says, in 

 comparison with his T. ertMrginatus, "corpore graciliore" — T. flavicornis is a 

 more robust species than T. emai-ginatus. 



Tachys convexus Macleay. 



Bcmhidhnn eonvcxum, Macleay, Trans, Ent. Soc. N.S. \V:iles, ii., 1871, p. 

 115. — Bembidium bistriatum, Macleay, ibid. 



The name T. bistriattts was already in use when Ma<deay proposed it in 

 1871, therefore T. convexus must be used. I have on several occasions carefully 



