FLIES OF GENUS CONOPS — CAMRAS 165 



The paratype female lacks the black on the cheeks and, in my opin- 

 ion, does not belong to this species. Rather, I believe it belongs to 

 the subgenus Aconops, and it is provisionally referred to longistylus, 

 although it may represent a new species. 



Range: Mexico, Nicaragua. 



Material examined: Nicaragua: Chinandega (USNM), 1 male 

 type). Mexico: San Rafael, Vera Cruz, July 3, Townsend, 1 male 

 (paratype, USNM); Cuernavaca, Sept. 4, 1922, E. G. Smyth, 1 

 (abdomen off) (USNM). 



Physoconops (Pachyconops) gracilianus, new species 



Description: Male: Length 15 mm. Front dark yellowish with 

 an indistinct narrow blackish brown stripe in front of the vertex con- 

 nected with a narrow line that extends downward past the base of the 

 antemiae. Vertex dark yellow, the ocellar swelling black. Face and 

 cheeks entirely yellow, the facial grooves and anterior orbitals whitish 

 pollinose. Antennal segment 1 light brownish, segments 2 and 3 

 black, reddish below and on arista. Segment 2 about twice length of 

 segment 1, segment 3 equal to segment 2. Proboscis black, brownish 

 in the middle, 1 % times head height. Occiput blackish above, yellowish 

 below. Posterior orbitals white pollinose. Thorax black, the humeri 

 and scutellum reddish. Pale yellow pollinose medial to the humeri, 

 on the scutellum, and a vertical stripe on the pleurae. Anterior and 

 middle coxae dark reddish covered with whitish pollen. Femora 

 reddish, posterior one darkened. Tibiae yellowish at base, dark 

 reddish distall}^. Tarsi blackish, the first reddish. Pulvilli and claws, 

 except the black tip, yellow. Wings with dark pattern extending to 

 the thu'd vein and the vena spuria, paler in the costal and subcostal 

 cells and apex of the wing. Remainder of the wing hyaline except 

 along fifth vein. Calypters and halters yellow. Segments 1 and 2 

 of the abdomen black, the remainder dark reddish. Junction 

 of segments 2 and 3 with a moderately wide yellow pollinose band. 

 Narrower distal margins of segments 3 and 4 gold pollinose. Segments 

 5 and 6 nearly covered with golden pollen. Genitalia dark reddish. 



Female: Length 12 mm. Similar to the male. The theca moderate 

 in length and rather robust, yellow anteriorly. 



Variation (in paratype): Length 14 mm., otherwise similar to the 

 male. 



Types: Holotype, male (USNM 62425). Allotype, Cuernavaca, 

 Morelos, Mexico, September 1923, E. G. Smyth. Paratype: Imale, 

 same data (author's collection). 



Remarks: This species is related to brachyrhynchus and gracilis, 

 but the distal abdomen is reddish with segments 1 and 2 black. In 

 gracilis if there is black on the abdomen it is on the distal segments; 



