414 CARABID^ FROM TROPICAL AUSTRALIA^ 



Lachnothorax, where they constitute a special group endemic to 

 Australia: (our other species, L. palustris SL, is a typical species 

 of Lachnothorax. Cf. Sloane, these Proceedings, 1910, xxxv., 

 p.398). 



All the Australian species of the tribe Odacanthini, which I 

 have examined, have had, in the (J, the anterior tarsi in some 

 degree dilatate, with the three basal joints bearing two oblique 

 rows of squamse on their undersurface (in some cases, e.g., Basi- 

 stichus micans Macl., these rows of squamae are weak).* All our 

 species have the apex of the abdomen unisetose on each side in 

 (^, bisetose in ^; there is a notch, more or less distinct, in the 

 middle of the apex in ^ (sometimes this notch may be seen less 

 developed in the 9? ^-y-, Basistichns micans). 



Table of Australian Genera. 



1(2) Anteiiiiffi with third joint sparingly pubescent, basal joint Avith 

 more than one seta. Tarsi hairy above. (Prothorax short, 

 with distinct lateral margins) Lachnothorax. 



2(1) Antennas with three basal joints glabrous, basal joint uni- 

 setose. Tarsi not setose on middle of upper side. 



3(4) Head not constricted behind ej^es; neck very wide Porocara. 



•4(3) Head more or less constricted behind eyes; neck narrow, often 

 condyliform, 



* Lacordaire reports these squamae in Casnonia (Genera, p. 73), but G. 

 H. Horn (Trans. Am. Ent. Soc, 1881, p. 147) saj^s of the tribe Odacan- 

 thini, "The anterior tarsi exhibit no differences in the two sexes." I 

 believe this remark refers to'C. penn'<ylranica Linn., in which I have not 

 been able to detect any squamte in 6 . Lacordaire saj^s of the genus 

 Odacantha, "tarses hliformes, simples dans les deux sexes." I am not 

 sure whether he means by "simples" that the anterioi- tarsi are without 

 squamte beneath in 6 , but I have noticed that O. nielannra Linn., of 

 Europe, has the three basal joints slightly dilatate, with two rows of 

 squamas beneath in 6. It maybe noted in this connection that I have 

 said, when describing Lachnothorax palustrU, the anterior tarsi in 6 "are 

 not dilatate nor clothed beneath" ; subsequent examination of the type ( 6 ) 

 showed this statement to be erroneous, for though the anterior tarsi can 

 hardlj' be said to be dilatate, I have clearly perceived two narrow, feeblj'- 

 developed rows of squama? on the under side of the three basal joints; in 

 L. riveriwp, too, I have seen two narrow rows of squamte on under side of 

 tarsi in 6 . 



