308 SUPPLEMENT. 



yellowish-white, with a broad median stripe and a spot on each side brown. Pleurae thinly whitish- 

 poUinose. Abdomen shining black, the first segment whitish-pollinose, the pile along the sides of the 

 anterior segments whitish. Legs yellowish-red, the front and middle femora above, the hind femora, 

 except the base and tip, and the tarsi for the most part, black. Wings greyish-hyaline. Length 

 3| millim. 



Hah. United States, New Mexico (coll. Univ. of Kansas). — Mexico \ Teapa in 

 Tabasco (H. H. Smith). 



Two specimens. This species is the smallest member of the family known to me. 



PSILOCUEUS. 



Psilocurus, Loew, Berl. ent. Zeitschr. xviii. p. 371 (1874). 

 Orthoneuromyia, Williston, Kans. Univ. Quart, ii. p. 67 (1893). 



1. Psilocurus caudatus, sp. n. (Tab. V. fig. 20, e .) 



c? ? . Black. Front brownish-yellow-pollinose, with a shining spot in the middle. Pace moderately gibbose 

 on the lower half, the convex portion covered with yellow hair ; clothed throughout with yellow dust and 

 pubescence. Occiput with a transverse row of black bristles above. Antennae black, the third joint 

 shorter than the first two together ; ovate, with a minute style. Ground-colour of the mesonotum in 

 some reflections wholly concealed beneath the appressed yellow pubescence or short pile. Pleurae grey- 

 pollinose ; with a median, vertical, oval black spot. Scutellum clothed with yellow pubescence, its border 

 with two stout, erect, black bristles. Abdomen, when seen from the side, concealed beneath pubescence 

 like that of the mesonotum, appearing, however, variable, the pubescence in a direct view only slightly 

 modifying the shining, somewhat metallic, black colour ; posterior angles of all the segments with a 

 triangular spot of opaque, greyish-yellow dust ; near the middle of the lateral border of each segment are 

 two erect yellowish bristles ; sixth segment in both sexes with its posterior border fringed with long 

 black bristles, which are longer and more abundant in the male. Legs throughout with appressed 

 yellow pubescence, varying in appearance in different reflections; all the metatarsi emarginate below.' 

 Wings greyish-hyaline, the veins closing the outer end of the discal and fourth posterior cells sometimes 

 continuous, but usually separated by a short segment of a vein, and sometimes not quite parallel. Length 

 9 millim. 



Hal. Mexico, Chilpancingo, Amu] a, and Tepetlapa in Guerrero (H. H. Smith). 



Six males and eistfit females. This species, while apparently very closely allied 

 structurally to P. nudiusculus, Loew, the type of the genus, differs very materially in 

 the coloration, especially in the female. P. modestus, Willist., from Mah«, has the 

 antennse longer and two additional bristles on the scutellum. $$ 



HOLCOCEPHALA (p. 171). 



2. Holcocephala nitida. 



Dasypogon nitidus, Wiedem. Aussereur. zweifl. Ins. ii. p. 643 1 ; Walk. List &c. vi. p. 503 2 . 

 Discocephala nitida, Walk. List &c. vi. p. 496 3 ; Bellardi, Saggio etc. ii. p. 82 \ 

 Discocephala minuta, JBellardi, loc. cit. p. 83 5 . 



Hah. Mexico 123 , Fortin near Vera Cruz, Teapa in Tabasco (H. H. Smith), 

 Tuxpango near Orizaba 4 , Jalapa 5 . 



Twenty-five specimens. Notwithstanding Bellardi's observations, I believe that the 



