MYDAA. 317 
verse suture; before the suture the ground-colour is somewhat whitish, at the sides and near the hind 
border of the thorax more or less rufous ; sometimes the two median stripes have also a reddish tinge ; 
in the female the thorax is fulyous, with brown stripes; there are two dorso-central bristles before, and 
four behind, the suture. Scutellum rufous, with a more or less distinct blackish basal spot. Abdomen 
of the male ovate, yellowish-rufous, with a blackish dorsal stripe and narrow hind margin to the second 
and third segments; anal segment brown. Abdomen of the female pointed towards the tip, without 
dorsal stripe, but with the black hind margins to the second and third segments broader, and sometimes 
having a triangular projection in the middle. In both sexes the third segment has a row of weak 
marginal macrochete, and there are several, also discal, macrochete on the anal segment. Legs rufous, 
the tarsi blackish ; hind tibie slightly curved; foot-claws and pulvilli of the male rather elongate, the 
pulvilli yellow. Tegule yellow. Wings yellowish-grey; small cross-vein nearly under the end of the 
first vein and a little beyond the middle of the discal cell; third and fourth veins divergent towards the 
tip of the wing; terminal and penultimate sections of the fourth vein equal in length; posterior cross- 
vein slightly undulate. 
Hab. Mexico1, Sierra de las Aguas Escondidas in Guerrero 7000 to 9500 feet 
(H. H. Smith), Northern Yucatan (Gaumer). 
A single male from Yucatan, and six females from Guerrero are before me. The 
description given by Giglio-Tos is perfectly applicable to the female specimens. As 
the male agrees with them in its principal characters, I have no doubt that it belongs 
here. 
2. Mydea obscura, sp.n., ¢. (Tab. VIII. figg. 3; 3a, head in profile.) 
Cinereous ; four stripes on the thorax and two dorsal spots on the abdomen blackish ; antennz, palpi, and legs 
rufous. 
Length 10°5 millim. 
Head whitish-cinereous ; front very narrow, but separating the eyes; frontal band black, linear; face perpen- 
dicular; vibrisse at the oral margin, which is not prominent; cheeks narrow; inferior part of the head 
with several bristles. Antenne rufous, inserted beneath the median line of the eyes; second joint a 
little projecting, with some bristles; third joint nearly three times as long as the second; arista thickened 
at the base, with long and fine hairs. Proboscis brown; palpi cylindrical, dark rufous. Thorax and 
scutellum cinereous; thoracic dorsum with four distinct blackish stripes, the external stripes interrupted 
at the transverse suture; humeral cicatrix rufous; four dorso-central bristles behind the suture. 
Abdomen broadly ovate, cinereous, with blackish dorsal spots on the second and third segments ; under- 
side somewhat rufous at the base; anal segment with several irregular macrochete. Legs, including 
the coxe, rufous, the tarsi dark brown or black; foot-claws and pulvilli elongate, the pulvilli yellow. 
Tegule yellowish. Wings brownish-grey; small cross-vein before the end of the first vein and beyond 
the middle of the discal cell; third and fourth veins distinctly divergent and slightly curved towards the 
end; terminal and penultimate sections of the fourth vein nearly equal in length ; posterior cross-vein 
oblique and curved. 
Hab. Mexico, Northern Yucatan (Gaumer). 
Four male specimens. 
8. Mydza concinna, sp.n., 3 2. 
Cinereous; four black stripes on the thorax; antenne, palpi, and legs rufous; basal segments of the abdomen 
in the male yellow and transparent. 
Length 6 millim. 
Head grey, with white reflections ; eyes nearly cuntiguous in the male; front of the female as broad as the 
