Sept., : 9 o8.j Wheeler : Studies on Myrmecophili L35 



will separate it. The Central-American subulata resembles nigrina 

 somewhat but differs in the more attenuated elytra, wider humeri and 

 the elytral apices truncate with the sutural angle mucronate. 



Lebasiella mesosternalis, new species. 



Form of tnarginella and pallipes ; black; head, thorax, antennn.', except club, 

 and median part of mesosternum red ; elytra dark blue. Head and thorax moderately 

 coarsely and densely punctate, clothed with erect dark hairs. Elytra coarsely and 

 •closely punctate ; pubescence dark, short and erect as on thorax. Abdomen moder- 

 ately coarsely and less closely punctate than the elytra. Length 4 mm. 



Huachuca Mts., Arizona. 



The blue, coarsely punctate elytra separates this species from 

 tnarginella and pallipes ; the shorter robust form and the narrower in- 

 termediate antennal joints which are similar to tnarginella and pallipes 

 from the rest of our species. 



STUDIES ON MYRMECOPHILES. II. HETiERIUS. 



By William Morton Wheeler, 

 Boston, Mass. 



The myrmecophilous beetles of the Histerid genus Hetarius, which 

 are widely distributed over the north temperate zone, have attracted 

 the attention of a number of entomologists. Lewis (1884) has de- 

 scribed a couple of species {H. gratus and optatus~) from the nests of 

 Japanese ants. The common European H. ferrugineus has been briefly 

 studied by Ernest Andre (1874), Escherich (1897), Forel (1S74), 

 Gradl (1879), von Hagens (1865, 1879), Janet (1897), Janson 

 (1857), Lucas (1861), Marseul (1853-62), and Wasmann (1886, 

 1894, 1898), and several North African species have been described 

 by Lewis (1888a, 1888b) and Thery (1897). Some attention has 

 been paid to our North American Helariihy Brues (1903), Cockerel! 

 (1890), Fall (1907), Liebeck (1S91), Schwarz (1889), and Wi< k- 

 ham (1892). 



Most of these authors, however, merely record the occurrence of 

 the beetles with certain ants (in several instances inaccurately identi- 

 fied) but tell us nothing about their habits. Indeed, apart from the 

 currence with certain hosts, the habits of all the species, except the 



