245 



MYRMECOPHILOUS (OLEOPTERA. 



By E. H. Zeck. 



(Phi to xix.) 



Amongst the many interesting and remarkable Families of the Order Coleop- 

 ttra, found in association with ants, are the Ptinidae and Colydiidae. 



Illustrated on the accompanying plate are four species, of different genera, 

 of the Family Ptinidae, and one species of the recently made genus, Euelarkia, of 

 the Family Colydiidae. 



These figures have in eaeh case been drawn from specimens which were kindly 

 forwarded me by Mr. J. S. Clark, who is an enthusiastic collector amongst ants' 

 nests in Western Australia. 



FAMILY PTINIDAE. 



Genus Diphobia, Olliff. 



D. longieornis Lea. Trans. Roy. Soe. Smith Aust., xliii., 1919, p. 256, pi. xxv., 



fig. 41). 



Diphobia longieornis Lea. 



Plate xix., 1%. 4. 



Castaneous. Upper surface with sparse and short semi-erect setae. Lea says 

 of this species: — "Readily distinguished from all the other species of the genus 

 Ijy the long terminal joint of the antennae." 



The sterna and abdomen are glabrous. The femora are grooved throughout 

 their length, on the under surface, for the reception of the tibiae. 



llnli. — Western Australia, Swan River, from nests of twig-mound ant, Iri- 

 domijrmex up. Type collected by J. S. Clark. 



Length 1.75 — 2.25 mm. 



Genus Enasiba Olliff. 



E. tristis Olliff. Pruc. Linn. Soc N.S.W., x., 1886', p. 839; Lea, Proc. Roy. Soc. 



S. Aust., xliii., 1919, p. 254, PI. xxv., figs 37, 38. 

 Enasiba tristis Olliff. 

 Plate xix., fig. 2. 

 Colour almost black; on the sub-basal impression of the prothorax theie are 

 four small short golden fasciae. 



Hab. — Western Australia, Swan River. Recently taken by Mr. J. S. Clark 

 in the nests of the twig-mound ant, Iridomyrmex conifera. 

 Length 3.5 — 4 mm. 



Genus Ectrephes Pascoe. 

 E. formicarum Pascoe, Proc. Ent. Soc. Lond., 1866, p . 16 ; Westw., Trans. Ent. 

 Soc. Lond., 1869, p. 315; Lea, Proc. Roy. Soc. S. Aust., xliii., 1919, p. 256, 

 PI. xxv., figs. 41, 42. 

 Kreusleri King. (Ana pest us) , Trans. Ent. Soc. N.S.W., I., 1866, p. 317, t. 16, 

 f. 1. 



