ANALES DEL MUSEO NACIONAL DE HISTORIA NATURAL 



« BERNARDINO KIVADAVIA », BDENOS AIRES 

 Tomo XXXIY, págiuas 573 a 576, dicieiubie 28 de 1928 



(Entomología, Publ. n" 142.) 



TWO NEW AND REMARKABLE SYRPHIDAE 



JN THE MISE» NACIONAL UE HISTORIA NATURAL DE BUENOS AIHES 

 By RAYMOND C. SHANNON 



Tbanks to tlie courtesy of Professor Doello-Jurado, director of tLe 

 Museo de Historia Natural de Buenos Aires and to Doctor Juan 

 Bréthes, curatorofthe collections of insects, I liave been able to 

 examine tlieir collection of Syrpliidae, wliich includes tlie reniaining 

 type specimens of tliis family described by F. Lynch Arri))á]zaga. 



Amono' otliers, tliere are two new species, belonging to different 

 genera, wbicli are of sufiQcient interest to merit being described im- 

 mediately. 



Tribe MYIOLEPTINI 



Lepidostola Bréthesi, new species 



This species was originally dctermined by Bretlies as Lepídosiola 

 pulchra VYillinston (West Indies) to wliich itbears a remarkably cióse 

 resemblance. However, in the species at band, tbe metasternum is 

 completely girdled witli cbitin, a cbaracter bitberto known only in 

 one other genus of its tribe Myioleptini, namely Zonemyia Sbannon, 

 1925. L. Bréthesi lacks tbe facial carina and transverserow of spines 

 on the anterior margin of tbe raesonotum whicl» are characteristic of 

 Zonemyia ; and altbougb it difí'ers from tbe other species of Lepidos- 

 tola by the presence of tlie complete girdle of cliitin on the metaster- 

 num, it is retained provisionally in this geuus. 



Description of species. — Male: Occipital ])ile normal, ocellar 

 triangle with yellow pubescence, frontal triangle dark with upper 



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