DIDYMA. 163 
hind tibiz outwardly with several bristles of unequal length ; foot-claws and pulvilli short in both sexes. 
Tegule and wings greyish-hyaline ; small cross-vein a little before the middle of the discal cell; apical 
cross-vein nearly straight; posterior cross-vein slightly curved inwards. 
Hab. Mexico, Xucumanatlan 7000 feet, Omilteme 8000 feet, and Sierra de las 
Aguas Escondidas 9500 feet, all in Guerrero (H. H. Smith), Orizaba (F. D. G. & 
H. H. Smith). 
A male and several female specimens. 
13. Didyma inconspicua, sp. n., 2. 
Yellowish-cinereous ; four thoracic stripes, reflecting spots and a dorsal stripe on the abdomen, antennx, and 
Length 4°5 millim. 
Front yellowish-cinereous, broader than the eyes; frontal band brown, narrower than the lateral portions, but 
not always conspicuous ; frontal bristles few in number, descending beneath the second antennal joint; 
face and cheeks greyish-white ; eyes thinly pilose. Antenne a little shorter than the face; second joint 
bristly ; third joint four times as long as the second; arista thickened to its proximal half. Proboscis 
black ; palpi rufous. Thoracic dorsum yellowish-cinereous, with four black stripes—the median stripes 
distant from each other and much narrower than the outer ones; behind the transverse suture the stripes 
disappear in a more general black coloration, which, however, is not extended to the hind margin of the 
thorax ; pleurs grey ; scutellum black, with a cinereous hind border. Abdomen ovate, flattened ; first 
segment black ; the following segments cinereous, with black reflecting spots, chiefly on the hind borders 
of the segments ; on the second segment the black colour has a larger extension and the light colour is 
reduced to a narrow whitish front margin ; the two intermediate segments have a black dorsal stripe and 
short marginal macrochete ; on the posterior half of the anal segment several short macrochete are 
irregularly placed. Front tibie outwardly with a row of short bristles; middle tibie with some long 
bristles ; hind tibie with several bristles of unequal length; foot-claws and pulvilli short. Tegule 
white. Wings nearly hyaline; small cross-vein on the middle or just before the middle of the discal 
cell; apical cell narrowly opened a little before the wing’s tip ; apical cross-vein nearly straight ; posterior 
cross-vein slightly curved. 
Hab. Mexico, Amula in Guerrero 6000 feet (H. H. Smith). 
A single female specimen. 
14. Didyma commixta, sp. n. ( 2 2). 
Shining black; thorax anteriorly grey, with four black stripes; abdomen with whitish front borders to the 
segments ; no discal macrochete ; palpi black. 
Length 5:5 millim. 
Nearly allied to D. nagricolor and D. albomicans, and having some of the characters in common with the one or 
the other. Asin D. albomicans, the front is as broad as the eyes, the thorax has before the transverse 
suture some grey tomentum and four black stripes (which, however, are not very distinct), and the 
posterior cross-vein is slightly curved. Resembling D. nigricolor in having the head very obscure, the 
palpi black, and the abdomen densely pilose and without discal macrochete ; but differing from it in the 
marginal macrochete being longer, and, therefore, more conspicuous. The bristles on the outside of the 
hind tibie are nearly fringe-like. 
Hab. Mexico, Teapa in Tabasco (H. H. Smith). 
A single specimen, apparently a female. 
Another example, from Vera Cruz (H. H. Smith), may be considered as a variety of 
— D. commixta. It is smaller in size (3°5 millim.), and differs in having a grey head and 
y 2 
legs black; palpi rufous ; abdomen with short marginal and no discal macrochete. Yd vce lore. 9 ? 
