RHYNCHODEXIA. 233 
13. Rhynchodexia punctipennis, sp. n., ¢ 2. 
Blackish ; abdomen with lateral whitish or yellowish spots; basal joints of the antenne and the palpi rufous ; 
base of the wings and small cross-vein fuscous. 
Length 9-11°5 millim. 
Blackish or piceous, somewhat shining. Head whitish-grey, the front with blackish, the oral margin and 
cheeks with brownish-rufous, reflections ; front of the male much narrowed behind, the eyes being nearly 
contiguous on the vertex, that of the female broader than the eyes; frontal band fuscous ; vibrissal 
swellings parallel. Antenne with the first two joints and the base of the third rufous, the latter for the 
rest blackish ; second joint prominent, with a long and some short bristles ; third joint twice as long as 
the second; arista thickened in its proximal half, and in the middle delicately plumose. Proboscis black, 
a little longer than the head ; palpi rufous, slightly thickened towards the tip, and with long hairs. Thorax 
black, in some specimens (especially in the females) anteriorly with whitish tomentum, which is inter- 
rupted by the beginning of three black bands, the middle band showing more or less three lines; scutellum 
piceous or even dark rufous. Abdomen piceous, short-conical in the male, broadly ovate in the female ; 
second and third segments with yellowish-white lateral spots; in the female these spots are larger and 
also present on the anal segment. The thorax and abdomen of the male are very hairy and beset with 
many macrochete; in the female the macrocheete of the abdomen are less numerous and the discal. ones 
shorter than the marginal. Legs black or piceous; hind tibia of the male slightly curved ; underside of 
the femora and the outer side of the tibize with many long bristles ; foot-claws and pulvilli elongate im the 
male, the pulvilli obscure. Tegule grevish, with a yellow margin. Wings cinereous, the basal cells and 
a spot on the small cross-vein brown ; this cross-vein on the middle of the discal cell; curvature of" the 
fourth vein forming a rounded angle ; apical cross-vein concave ; posterior cross-vein curved. 
Hab. Mexico, Ciudad in Durango 8100 feet (Forrer), Omilteme 8000 feet, and Sierra 
de las Aguas Escondidas 9500 feet, both in Guerrero (H. H. Smith). 
Four male and six female specimens. 
14. Rhynchodexia angulata, sp.n., ¢ 2. 
Blackish or dark cinereous; thoracic dorsum with black stripes; abdomen with black and whitish reflecting 
spots; palpi and base of the antenne rufous ; curvature of the fourth vein angular. 
Length 9-10°5 millim. 
Head whitish, with dark grey reflections; oral margin slightly rufous; front of the male narrowed behind, 
that of the female broader than the eyes; frontal band black or dark brown ( ¢) or rufous-brown ( @ ) ; 
vibrissal swellings parallel. Antenne black, the two basal joints and the base of the third usually rufous ; 
second joint with long bristles; third joint nearly twice as long as the second ; arista black, thickened at 
the base. Proboscis black; palpi rufous, slightly thickened towards the tip. Thorax obscure cinereous, 
with five black stripes, the three median close together ; in some specimens the thoracic dorsum blackish, 
only before the transverse suture with cinereous tomentum and stripes; scutellum black, with some 
reddish tint. Abdomen of the male conical, that of the female ovate, convex, pointed towards the anus; 
in both sexes cinereous, with blackish-brown and whitish reflecting spots, in the male with many discal 
and marginal macrochete, in the female with macrochete on the hind margins of the segments and also 
a pair on the disc of the third. Legs black, the tibie piceous (sometimes rufous); front femora with 
regularly arranged bristles ; middle and hind tibize with scattered bristles ; foot-claws and pulvilli elongate 
in the male, the pulvilli yellowish-grey. Tegule yellowish. Wings grey; curvature of the fourth vein 
with an acute angle and in some specimens with a very short appendage; small cross-vein on or a little 
before the middle of the discal cell; apical and posterior cross-veins curved. 
Hab. Muxtco, Ciudad in Durango (Forrer), Jalisco (Schumann), Acapulco, Xucu- 
manatlan 7000 feet, Omilteme 8000 feet, Sierra de las Aguas Escondidas 9500 feet, 
all in Guerrero (H. H. Smith). 
bo 
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BIOL. CENTR.-AMER., Dipt., Vol. II., May 1891. 
