138 DIPTERA. 
a large series of examples, including both sexes. Some of them differ a little from 
the others, and I have given here a renewed description to include these. Amongst 
the numerous specimens, there are some which might be regarded as belonging to a 
distinct species; but as many transitions are to be found, I think we have here to do 
with varieties of the same specific form. | 
The following two species are closely allied to M. diadema ; the characters separating 
them from it are, however, of such a nature as to indicate that they are really distinct. 
10. Myobia longipalpis, sp. n., ¢. 
Pale rufous; face and cheeks white; abdomen with black dorsal spots and lateral points; palpi long and 
exserted ; third vein with a row of bristles. 
Length 6 millim. 
Front broader than the eyes, pale rufous, the frontal band inconspicuous ; frontal bristles on each side in a 
single row, scarcely descending beneath the root of the antenne ; eyes not reaching to the vibrisse ; 
cheeks broad. Antenne rufous; second joint with a short bristle ; third joint three times as long as the 
second, infuscated towards the tip; arista thickened in its proximal half, microscopically pubescent. 
Proboscis long and slender, pale rufous, more obscure towards the tip, the terminal lips black; palpi 
rufous, cylindrical, long, and stretched out beyond the oral margin, the tip with short black hairs. Thorax 
and scutellum ochraceous, the usual thoracic stripes almost obsolete; pleurse whitish. Abdomen ellip- 
tical; the first two segments yellowish and transparent, the third and anal segments of a more rufous 
colour ; on the hind margin of the second and third segments a black dorsal spot and a lateral point ; 
macrocheete few in number, only at the hind margins of the segments and inserted in the black spots and 
points ; anal segment with a black point on each side beneath. Legs pale rufous, the tarsi black ; tibie 
with rather short and weak bristles. Tegule yellowish. Wings greyish-hyaline; third vein with a row 
of short bristles extending from the base to the small cross-vein, the latter on the middle of the discal 
cell; curvation of the fourth vein rounded ; apical cross-vein concave before its end ; posterior cross-vein 
straight. 
Hab. Mexico, Chilpancingo in Guerrero 4600 feet (H. H. Smith). 
Two female specimens. 
11. Myobia flavipennis. 
Dexia flavipennis, Wiedem. Aussereur. zweifl. Ins. ii. p. 380. no. 19°. 
In general coloration and markings similar to M. diadema, but differing from it in the rufous frontal band and 
the more convex shape of the abdomen. The front is broader, especially in the male; the frontal band 
is at least as broad as the lateral portions; the antenne are longer, the third joint less infuscated and 
nearly four times as long as the second; the arista is still more distinctly pubescent or shortly plumose. 
The abdomen is convex, ovate in both sexes, and of a more opaque rufous colour, with black dorsal spots ; 
laterally it has some white or yellowish reflections ; the anal segment is sometimes infuscated. The front 
tibie of the male are longer and the tarsi proportionately shorter. The third vein (which is not bristly) 
is curved at its end, the apical cross-vein a little concave, the posterior cross-vein nearly straight. 
Length 7-9 millim. . | 
Hab. Mexico, Amula in Guerrero 6000 feet (H. H. Smith).—Braziu }. 
A male and several female specimens were captured by Mr. Smith at Amula. 
The description given by Wiedemann (J. c.) seems to be sufficiently applicable to the 
Mexican examples before me. 
