THELAIRODES. 259 
all in Guerrero, 1000 to 6000 feet, Atoyac in Vera Cruz, Teapa in Tabasco (H. H. 
Smith). 
Several specimens of both sexes. 
The identity with Homodesxia vittigera, Big., is established by an examination of the 
typical Mexican example, kindly sent by M. Bigot for examination. 
2. Thelairodes cinereicollis, sp. n., ¢ ¢. 
Cinereous ; face and cheeks white; abdomen yellow, the first and second segments with a black dorsal band, 
the following segments with black hind borders ( ¢), or black with whitish front borders to the segments 
(2); legs piceous ; palpi and terminal lips of the proboscis yellow. 
Length 6°5 millim. 
Front yellowish or somewhat ochraceous, nearly as broad as the eyes, slightly narrowed behind in the male; 
frontal band black ; frontal bristles descending a little beneath the root of the antenne ; face, cheeks, and 
posterior orbits white, the latter with a row of hairs; beard white; eyes of the male microscopically 
pubescent. Antenne black, the third joint rufous at the extreme base; second joint with bristly hairs ; 
third joint four times as long as the second, rounded at the tip; arista thickened at the base, its plumosity 
shorter than in 7’. vettigera. Proboscis black, with the terminal lips yellowish-rufous ; palpi yellowish- 
rufous, filiform in the male, thickened towards the tip in the female. Thorax and scutellum cinereous ; 
thoracic dorsum ochraceous in the male, yellowish in the female, with very faint traces of darker stripes ; 
pleuree whitish-grey. Abdomen conical in tke male; the first two segments yellow and somewhat trans- 
parent, with a broad black dorsal band, which has concave sides; third segment shining black, with a 
whitish front border, the lateral portion of which is more extended and of the same yellow coloration as 
the preceding segments; the anal segment is whitish, with the hind border shining black; on the ventral 
surface is a yellowish or whitish pilosity. The abdomen of the female is black, the second and following 
segments with well-defined whitish front borders. In both sexes there are stout macrochetz at the hind 
margins of the segments. Coxe whitish ; femora black, the front pair greyish on the outer side and with 
whitish hairs beneath ; the front tibia and the middle and hind tibie in part rufous in tint in the male; 
the two hinder pairs with scattered bristles; in the male some bristles at the base of the middle and hind 
femora beneath are whitish ; foot-claws and pulvilli elongate in the male, the pulvilli yellowish, infuscated 
at the base. Tegule yellowish-white. Wings greyish, without a costal spine; third vein bristly from the 
base to the small cross-vein, the latter on the middle of the discal cell ; apical cross-vein a little concave ; 
posterior cross-vein slightly convex (¢ ) or nearly straight ( 9 ). 
Hab. Mexico, Amula 6000 feet, and Sierra de las Aguas Escondidas 9500 feet, both 
in Guerrero (H. H. Smith). 
A male from the latter, a female from the former locality. 
3. Thelairodes pallida, sp.n., 9. (Tab. VI. figg. 10; 10a, head.) 
‘Thorax and scutellum cinereous; abdomen yellow, a dorsal stripe and the third and anal segments black, the 
segments with white front borders; antenne rufous, infuscated towards the tip; proboscis, palpi, and 
legs yellow. 
Length 6°5 millim. 
Head white, somewhat silvery ; front broader than the eyes; frontal band black, narrower than the lateral 
portions; occiput grey; beard white. Antenne a little shorter than the face, rufous; the third joint 
brown towards the tip; arista thickened in its proximal half. Thorax and scutellum covered by a whitish- 
-grey tomentum, through which the black ground-colour is partly visible. The first and second segments 
and the front portion of the third segment of the abdomen are yellow and transparent; the rest of the 
third segment, the anal segment, and a dorsal band on the first and second segments are shining black ; 
the dorsal band is laterally concave; the second and following segments have white front borders and 
