ENSINA. ALT 
1. Ensina humilis. (Tab. XII. fig. 15, wing.) 
Trypeta humilis, Low, Monogr. Dipt. N. Amer. i. p. 81, t. 2. fig. 171; ill. p. 291, t. 10. fig. 17°. 
Acinia picciola, Bigot, in Ramon de la Sagra’s Hist. fis. polit. y nat. de Cuba, Ins. p. 347, t. 20. 
figg. 10, 10a’. 
Hab. Mexico, Orizaba (H. H. Smith & F. D. Godman), Chilpancingo in Guerrero, 
Teapa in Tabasco (7. H. Smith).—Cvusa 1-3, 
Three specimens (two males and one female). 
2. Ensina peregrina. (Tab. XII. fig. 16, wing.) 
Trypeta peregrina, Low, Monogr. Dipt. N. Amer. iii. p. 292, t. 10. fig. 30°. 
Hab. Mexico, Orizaba (H. H. Smith & F. D. Godman), Amula in Guerrero 6000 feet 
(H. H. Smith).—Brazit '. 
Six specimens, including both sexes. 
3. Ensina luculenta, sp.n., ¢. (Tab. XII. fig. 17, wing.) 
Cinereous; thorax with black stripes; abdomen with black spots; head and legs rufous, the femora blackish ; 
wings reticulated with brown, the fuscous border of the small cross-rein separated from that of the 
posterior cross-vein. 
Length 3 millim. 
Front rufous, anteriorly as broad as the eyes, slightly enlarged behind; the orbits white; frontal bristles 
black ; on the vertex behind the eyes a row of yellow bristles; face whitish-yellow, perpendicular ; oral 
margin not prominent; cheeks narrow. Antenne yellowish-rufous, reaching to beneath the middle of 
the face. Proboscis rufous, projecting and geniculated. Thorax and abdomen cinereous ; thoracic dorsum 
with three blackish stripes; abdomen with two rows of black dots. Legs rufous, the femora blackish to 
near the tip. Halteres rufous. Wings elongate, hyaline, with brownish reticulation ; stigma brown, 
with a white dot; three less distinct dark spots are also visible: the first adherent to the stigma, between 
the first and third veins and at its end bordering the small cross-vein; the second at the end of 
the second vein ; the third being a border of the posterior cross-vein. The basal portion and nearly the 
whole posterior region of the wings, including the discal cell, are hyaline ; inthe discal cell there are a tew 
greyish-brown cross-lines. As in all the other species of the genus, the cross-veins are approximated. 
| Hab. Mexico, Omilteme in Guerrero 8000 feet (f/f. H. Smith). 
A single male specimen. 
4, Ensina conspersa, sp.n., ¢. (Tab. XII. fig. 18, wing.) 
Cinereous ; head and legs rufous; abdomen with black spots; wings reticulated with brown, the brown 
colour largely extended; the fuscous border of the small cross-vein connected with that of the posterior 
cross-vein ; no hyaline spot in the first posterior cell above the posterior cross-vein. 
Length 2°5 millim. | . 
Closely allied to the preceding (Z. luculenta). The front is a little broader and also the cheeks; the stripes 
on the thorax are absent and the femora are not blackish. The most striking difference is in the pattern 
of the wings: the brown colour is more extended and covers a large portion of the central region; the 
infuscation of the small cross-vein is connected with that of the posterior cross-vein ; beyond the stigma, 
which has a clear dot, there are three hyaline rounded costal spots, and beneath these, between the second 
and third veins, a similar spot; in the basal part of the cubital and the first posterior cells the hyaline 
BIOL. CENTR.-AMER., Dipt., Vol. I1., February 1900. 3h 
