292 SUPPLEMENT. 



joints of the antennae light yellow (the third wanting). Proboscis black, about twice the length of the 

 head ; palpi very slender and short. Cheeks with some black hairs below. Occiput light yellow, black 

 in the middle. Mesonotum light yellow on the sides, with three broad brownish-red vittse, separated 

 by two slender opaque light yellow stripes. Pleurae light yellow, with reddish spots. Scutellum light 

 yellow, the disk for the most part reddish. Abdomen brownish-red, each segment with the posterior 

 part yellow or yellowish. Halteres with a brown knob. Legs yellow, the tarsi blackish at the tip. 

 Wings hyaline, the anterior part, and the distal border broadly, infuscated ; all the cross-veins with brown 

 clouds, as also on the origin of the second vein and the anterior branch of the third ; a long stump of a 

 vein in the discal cell from the vein at the base of the third posterior cell. Length 9 millim. 



Hab. Mexico, Sierra de las Aguas Escondidas in Guerrero 9000 feet (H. H. Smith). 



A single specimen. P. scolopax, O. S., examples of which I have seen from Southern 

 New Mexico, is an allied species : it is smaller, the proboscis much longer, the front 

 narrower below, &c. P. punctipennis, Walk., is also very much smaller. 



GERON (p. 156). 



No species was definitely referred by Osten Sacken to this genus in the earlier part 

 of this work. 



1. G-eron rufipes. 



Geron rufipes, Macq. Dipt. Exot., Suppl. i. p. 119 1 . 



Hab. Mexico, Chilpancingo, Tepetlapa, and Amula in Guerrero (H. H. Smith), 

 Jalisco (Schumann), Yucatan 1 (Gaunter). 



Numerous specimens. 



2. Geron trochilides, sp. n. 



3 . Prontal triangle and face greyish-yellow-pollinose, black in some reflections. Antennae black ; third joint 

 more than twice the length of the first two joints together, dilated distally, with an excision on the upper 

 anterior angle, in which is placed a minute style. Proboscis as long as the head and thorax together, black. 

 Palpi rudimentary. Mesonotum densely yellowish-grey-pollinose, with a pair of median slender stripes 

 and a series of three spots on each side, the one behind the suture dilated outwardly in front, all opaque 

 T)lack ; pile for the most part blackish, erect, rather abundant. Pleura? yellowish-grey-pollinose ; knob 

 of the halteres yellow. IScutellum shining black, grey on the margins, with black pile. Abdomen opaque 

 greyish-yellow, with long dusky yellowish pile. Legs yellow, the tip of the femora and tibia;, aud all 

 the tarsi, black or blackish. Wings brownish, more distinctly so at the base ; ultimate and penultimate 

 sections of the third vein of equal length ; anterior branch of the third vein terminating a little before 

 the tip of the wing ; anterior cross-vein situated before the middle of the discal cell. Length 5 millim. 



Hob. Mexico, Acaguizotla in Guerrero (H. H. Smith). 

 One specimen. 



SYSTROPUS (p. 157). 



Table of Species examined in the supplementary collections received from Mexico. 



1. Legs black throughout dolor osus, sp. n. 



Four anterior legs yellow 2. 



