218 Journal New York Entomological Society. [Voi. vii. 



NEW GENERA AND SPECIES OF DEXIDiE. 



By D. W. Coquillett, Washington, D. C. 



At the time of the publication of Osten Sacken's Catalogue of 

 the described Diptera of this country, no family was in greater dis- 

 order than the Dexidse, the major portion of which were listed under 

 the old genus Dexia, a genus which does not occur in our fauna so 

 far as I am aware. Of these catalogued species, Dexia analis Say, 

 pedestris Walk., and pristis Walk.; Melanophora diabroticce Shinier, 

 and nigripes Desv.; Walker's three species of Illtgeria, and Microph- 

 thalma nigra Macq., are treated in my " Revision of the Tachinidse " 

 (Bull. No. 7, Technical series, U. S. Dept. of Agr., Div. of Entom.; 

 Oct., 1897). The remaining species from this region, together with 

 those described subsequently and in the present paper, are listed below. 

 The synonymy, except where otherwise stated, is by the writer ; names 

 of genera and species unknown to me are preceded by a mark of in- 

 terrogation (?). References to the descriptions of the genera and 

 species catalogued by Osten Sacken are omitted. 



Megerlea rufocaudata Bigot, if my identification is correct, belongs 

 to the Sarcophagid genus, Sarcophiiodes. 



The receipt of a specimen of Dexiosonia longifacies Rond. , from 

 Brauer and Bergenstamm, of Vienna, Austria, proves that this is a 

 synonym of Microphthalma disjuncta Wied., and the statement of 

 the above authors that Dexiosonia is a synonym of Alicrophthalma is 

 evidently correct. 



Descriptions of New Forms. 

 Megaparia opaca, sp. nov. 



Male and female. Black, the two basal joints of antenna, palpi, apex of pro- 

 boscis, apices of femora, tibiie and base of tarsi, yellow, lower half of head brown. 

 PVont of male at narrowest point one-lhird as wide as, in the female almost twice as 

 wide as either eye, the sides and those of the face covered with stout black bristles, 

 two orbital bristles in the female, wanting in the male ; antennre not reaching one- 

 third of distance from their base to the oral margin, the second and third joints sub- 

 equal in length, longest hairs of arista twice as long as its diameter at its base ; 

 vibrissse inserted near the middle of the face, cheeks in the male two-thirds as broad 

 as, in the female as broad as, the eye-height ; head in profile nearly elliptical, over 

 twice as high as long, face considerably retreating below, a low carina in the middle 

 of the depression, eyes bare, proboscis rather slender, the portion beyond the basal 



