316 SUPPLEMENT. 



3. Atomosia macquarti. 



Atomosia macquarti, Bellardi, Saggio etc. ii. p. 20 \ 



Hab. Mexico 1 , Amula in Guerrero, Atoyac in Vera Cruz, Teapa in Tabasco 

 (H. H. Smith), N. Yucatan (Gaumer). 



Numerous specimens, perhaps belonging to this species. None of them have the 

 first posterior cell quite closed. The dust of the face is white, that of the mesonotum 

 only rarely yellowish. The male hind tarsi are rather densely clothed with silvery, 

 white hairs. In some examples the tibiae are largely yellow ; such agree pretty well 

 with the description of A. tibialis, Macq. A. macquarti was not identified by Osten 

 Sacken. 



4. Atomosia anonyma, sp. n. 



2 . Antennae elongate, the first joint about three times the length of the second, the two together two-thirds 

 the length of the third. Pace with white hair and dust. Mesonotum and abdomen shining, somewhat 

 metallic black. Legs yellow ; distal half of the hind femora, the hind tibia, except the base, and the 

 hind tarsi, except the base of the metatarsi and the distal joints of the other tarsi, black ; sometimes the 

 four anterior tarsi for the most part, or the distal joints only of the hind tarsi, are black. Win^s 

 hyaline ; first posterior cell closed. Length 8 millim. ° 



Hab. Mexico, Chilpancingo in Guerrero (H. H. Smith). 



Six specimens. There are many descriptions of South-American species that will 

 nearly apply to this one, but none sufficiently well to remove doubt. 



ATONIA. 



Atonia, Williston, Psyche, 1889, p. 257. 



I. Atonia brevistylata, sp. n. (Tab. VI. fig. l, $ .) 



$ . Black, shining. Pront, face, and occiput clothed with whitish-grey dust, with a silvery reflection below 

 Beard and thin pile of the face silky-white; mystax not abundant, white. Antenna black; first two 

 joints of equal length, short, with black bristles ; third joint scarcely twice the length of the' first two 

 together, the lower border convex, the upper nearly straight, truncate at the tip ; style small, short, 

 conical, divaricate. Mesonotum with sparse, rather long, silvery pubescence,' and sparse,' erect' 

 short, black hair. Pleura densely white-pollinose ; a shining black spot on the mesopleura ; trichostieal 

 bristles white. Tegula yellow. Abdomen black, shining, finely punctulate, the pubescence or short pile 

 on the posterior angles and borders of the segments white. Legs black ; all the tibise and tarsi with 

 long, chiefly black, bristles and white hairs, which on the middle tibia are regularly arranged • hind 

 tibiae on the inner side with short white pile. Wings nearly hyaline; second posterior cell coarctate, 

 the first widened in the margin. Length 6 millim. 



Hab. Mexico, Teapa in Tabasco (H. H. Smith). 



A single specimen. This insect is very closely allied to the type of the genus, 

 A. miki, Will., from San Domingo (Trans. Am. Ent. Soc. xiii. p. 290), and it is possible 

 that it may be the other sex of that species. The middle tibia? do not have the 

 peculiar dilatation described, but that would not be expected in the female. The 

 Mexican insect chiefly differs from the Antillean form in the length of the antennal 

 style and the shape of the third joint. 



