MESEMBRINELLA.—MORELLIA. 301 
1. Mesembrinella bicolor. (Tab. VII. fig. 18.) 
Mesembrinella bicolor, Gigl.-Tos, Mem. R. Accad. Scienze di Torino, ser. 2, xlv. (sep.) p. 11, 
figg. 1, 1 bis. 
Hab. Mexico!; Costa Rica, Caché (Rogers). 
Two female specimens. They agree perfectly with the ample description of Giglio- 
Tos, except that the posterior cross-vein is not distinctly bisinuate, but nearly straight, 
a difference which does not seem of sufficient importance to consider them as belonging 
to another species. 
2. Mesembrinella eneiventris, s ¢. (Tab. VII. figg. 19, 19a, head in 
profile.) 
Dexia eneiventris, Wiedem. Aussereur. Zweifl. Ins. ii. p. 376°. 
Hab. Mexico, Northern Yucatan (Gawmer).—Braziu}. 
A long series of specimens of both sexes. This insect is very closely allied to 
M. bicolor, the two species resembling one another in their general habitus and 
coloration (yellowish-testaceous, with the abdomen, except its base, metallic-blue). In 
M. bicolor the first vein reaches further on the costa, on account of which the medi- 
astinal cell is more elongate; besides this, MW. bicolor is of a somewhat larger size 
(length 10-11 millim.) than V. eneiventris (9 millim.). 
To Wiedemann’s description of the latter! may be added :—The front of the male 
is triangular, extended upwards in a white linear prolongation, scarcely separating the 
eyes, that of the female as broad as the eyes and with parallel sides; inferior part 
of the cheeks narrow (equalling about one-sixth of the longitudinal diameter of the 
eyes); vibrissee nearly at the oral margin; beard yellow; antennz inserted on the 
median line of the eyes, the third joint more than twice as long as the second. In the 
female the metallic coloration on the abdomen usually occupies nearly the whole of 
the second and following segments. The tarsi are brownish towards the tip, the 
foot-claws and pulvilli slightly elongate in the male. The apical cross-vein is close 
to, and parallel with, the margin of the wing; the posterior cross-vein is somewhat 
undulate. 
MORELLIA. 
Morellia, Robineau-Desvoidy, Essai sur les Myodaires, p. 405 (1830). 
This genus agrees with the two preceding in having the rounded curvature of the 
fourth vein forming a distinct apical cross-vein, and the apical cell moderately opened 
a little before the tip of the wing. From Graphomyia it may be known by the absence 
of the carina separating the antenne at their base; and from Mesembrina and Mesem- 
brinella by the middle tibiz being without a bristle on the inner side. 
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