AMERICAN DIl'TKRA. 19 



2«. ? Nicocles scitulns n. sp. Plate II, figs. I, la. 



9.— Wings liyaline with small brown spots; abdomen shining black with a 

 poUinose spot on the posterior angles of segments 1-5: posterior tibiae scarcely 

 thickened at the tip. Length 5i mm. 



Black. Head and antennae black ; face rather thickly whitish pubescent with 

 sparse, obscure, yellowish pile, black on the oral margin. Third joint of antennae 

 a little l)roader at its base. Front more shining, a little yellowish poUinose. Lat- 

 eral orl)its white poUinose; beard white. Dorsum of thorax and scutellum but 

 little shining, rather thickly brownish poUinose, with two linear median indistinct 

 stripes; on each in front a whitish poUinose spot, and more exteriorly in front of 

 the wings a larger, more yellowish spot. Pleurae, coxae and sides of metanotum 

 thickly whitisli poUinose; disk of metanotum shining. Abdomen bare, smooth, 

 shining, bluish black, in structure and markings like Nicocles; broadest at tip of 

 fourth segment; on the posterior angles of the first segment with a small whitish 

 poUinose spot, which becomes successively a little larger on the second, third and 

 fourth segments, but smaller on the fifth. Legs black ; thinly whitish pilose and 

 with light colored bristles; hind legs only a little elongate, of epual thickness 

 throughout: the tibiae not thickened at the tip, but gradually, and only moder- 

 ately so, from the base; the tarsi only slightly thickened. Wings not elongate, 

 fourth posterior cell wide open; hyaline, at distal ends of the first and second 

 basal and discal cells, and base of the suhmarginal cells with small brownish 

 clouds. 



One specimen, Wasliinjiton Territory (II. K. Morrison). 



This species will require the male to determine its correct place. I 

 doubt that it is a Nicocles. The wings are like Tnractlcnu. tlie hind legs 

 are shorter, stouter and not clubbed, the tarsi but slightly thickened ; the 

 abdomen is <[uite smooth, as in Nicoc/cs. With T. hrericoniia it forms a 

 connection between Tanicticiis, Blacodcs and Nicocles^ and they both 

 might perhaps be better placed under Blacodes, which then would be 

 distinguished from Tinactlcii)^ by the presence of a terminal style, and 

 from XicocIcK by the structure of the mule abdomen, should this species 

 be found not to posses the silvery nuirkings as I suspect. 



I>KSTOMl'IA. 



In his Western Diptera. [)age 21)1. IJaron Osten Sacken referred a new 

 species to the genus CUtvator Phillipi. described from Chili, but with a 

 doubt inasmuch as Phillii)i does not mention in his description the pres- 

 ence of tibial sjiurs. The type species ( i\ plmctlpcnuia Ph.). however, 

 has been since siiown tiot to possess this spur l>y tiie able dipterologist ol" 

 South America, Dr. K. Lynch Arribalzaga. who confirms the view pre- 

 viously taken of it by Uerstaecker (Entom. Ber. 1S(I5, !>'J and 113) and 

 Schiner. that it is synonymous with Hijixitctrs Lw.* The present genus, 

 lience, appears to be new, and I would propose for it the name Lestomi/id. 



*Catalogo de los Dipteros hasta ahora descrilns quo se eiicui'iitrenen las Repub- 

 licas del Hii. de la Plata, f^eparata. 29—1882. 



