24 . DIPTERA. 
stout; foot-claws and pulvilli elongate, yellow, the tip of the claws black. Tegule and wings greyish- 
brown ; small cross-vein nearly on the middle of the discal cell ; apical and posterior cross-veins oblique 
and a little curved. 
Hab. Mexico, Orizaba (H. H. Smith & PF. D. Godman). 
A single male specimen, captured in December 1887. 
8. Saundersia rufitibia, sp. n., 2. 
Black ; head yellowish ; thorax with cinereous tomentum and four black lines; abdomen densely beset with 
spines ; antenne and legs black, the tibiee dark rufous; tegule and wings greyish-brown. 
Length 11 millim. 
Front yellowish-grey, on the vertex as broad as the diameter of the eyes; frontal bristles descending to the 
number of three beneath the root of the antenne ; thorax with a dark cinereous tomentum, which covers 
the ground-colour, and with four longitudinal black dorsal lines, interrupted at the transverse suture ; 
scutellum black; antenne, abdomen, legs, tegule, and wings as in S. unicolor, the knees and tibia, 
however, dark rufous ; foot-claws and pulvilli, as usual in the females, short ; the front tarsi, except the 
basal joint, a little dilated. 
Hab. Mexico, Orizaba (H. H. Smith & F. D. Godman). 
A single female specimen, captured in December 1887. I should have identified this 
insect with S. nigriventris, Macq. (Dipt. Exot. ii. 3, p. 44), from Bogota, if the scutellum 
of the latter had not been described as testaceous. Macquart originally included this 
species in the genus Hystricia (with hairy eyes and fully developed palpi), and his 
figure (t. 4. fig. 3a) indeed shows distinct palpi. In Supplement I. of his work, 
p- 150, this author, however, transfers the species, on account of its very small palpi, 
into the genus Micropalpus (which included at that time also the present genus 
Saundersia). Schiner (Reise d. Novara, Zool. iii., Dipt. p. 334. 180) refers it to 
Saundersia. 
S. rufitibia is nearly allied to S. unicolor, and in most of its characters agrees with 
that insect; it is possible that they are the sexes of one and the same species. For the 
present, however, I abstain from uniting them, more especially on account of the 
striking difference in the colour and development of the thoracic tomentum. 
9. Saundersia testacea, sp.n. ¢ (9%). (Tab. II. figg. 1; 1a, the insect from 
the side, in order to show the arrangement of the spines.) 
Thorax dark cinereous ; scutellum and abdomen testaceous, the latter broad; anus shining black; antenne 
and legs black; wings brown. 
Length 14-17 millim. 
Face a little retreating, notably prominent near the ora. margin, sericeous-white, with grey reflections ; cheeks 
similarly coloured and with weak darker hairs ; vibrissee at some distance above the oral margin, accom- 
panied by a few shorter bristles ; beard white; front blackish-grey, narrowed behind, with a velvety- 
black median band, black hairs, and moderately strong bristles, the bristles descending on both sides in a 
single curved row to a little beneath the base of the antenne. Antenne black; the upper part of the 
second joint with short bristles; the third joint once and a half as long as the second, elongate-oval ; 
arista thickened in its basal half. Thorax blackish, with dark cinereous tomentum and longitudinal 
rows of bristles. Scutellum and abdomen yellowish-testaceous ; scutellum with two rows of spines, those 
of the posterior row the longest. Abdomen broader than the thorax, with black pile; the sides of the 
