456 SUPPLEMENT. 
ANCYLOGASTER. 
Ancylogaster, Bigot, Bull. Soc. Ent. Fr. 1884, p. lxix. 
Head slightly broader than the thorax, seen from in front somewhat higher than broad ; front as broad as the 
transverse diameter of the eyes, with erect hairs (no bristles), which diminish in length towards the vertex 
and descend to a little beneath the root of the antenne; face nearly perpendicular; oral margin not 
prominent, without vibrisse ; cheeks narrow. Eyes bare, reaching to the underside of the head, slightly 
excavated behind. Antenne obliquely exserted, rather long and slender; basal joints short; third joint 
five times as long as the second; arista bare. Proboscis and palpi small, the palpi slightly thickened 
towards the tip. Thorax nearly as long as broad, at the sides and behind with some bristles; scutellum 
with four bristles, two lateral and two posterior, the latter crossed. Abdomen cylindrical, composed of 
six segments, the last segments curved towards the venter ; genitalia well-developed ; macrochetz few in 
number, very short, and only at the hind margins of the segments. Legs moderately long; tibiz rather 
broad, attenuated towards the base and bearing some short bristles ; tarsi shorter than the tibia. Tegule 
large, rounded. Wings narrow at the base, rounded at the apex; curvature of the fourth vein angular ; 
apical cell narrowly opened a little in front of the wing’s tip; posterior cross-vein inserted much nearer 
to the curvature of the fourth vein than to the small cross-vein. 
On account of the curved abdomen, this genus must apparently be included in the 
group Phanine, from all the existing genera of which it differs in the elongate antenne, 
the absence of vibrissee, and the feebly-developed bristles. 
1. Ancylogaster armata. (Tab. XIII. figg. 16, ¢; 164, profile; 164, head.) 
Ancylogaster armatus, Bigot, Bull. Soc. Ent. Fr. 1884, p. Ixx’. 
Black ; face whitish; sides of the front, some markings on the thorax, second abdominal segment, and incisions 
of the following segments yellow; legs rufous, with black tarsi; wings brownish along the costa. 
Length 11 millim. 
Frontal band shining black, much broader than the sides; antenne black, the second joint somewhat reddish 
at the tip; arista rufous. Thoracic dorsum anteriorly with four yellow spots; the transverse suture of 
the same colour; on the pleure a perpendicular stripe appearing white in certain lights; scutellum 
rufous, with the base blackish. The first abdominal segment black; the second yellow, transparent, 
with a dorsal stripe and the hind margin black ; the following segments black, with a narrow yellow 
front-border ; the fourth and fifth segments with some light grey reflections ; the sixth segment, turned 
towards the venter, bears a cylindrical appendage, and ends in a pair of forceps with parallel branches ; 
on the hind margins of the first three segments are lateral macrochetw, and on that of the third there is 
also a pair of dorsal ones ; all the macrochete very minute. Legs almost bare; coxe black, with white 
reflections ; femora and tibiz rufous, the front femora on the upper and inner sides black, the other 
femora with a black stripe; tarsi black, except the terminal joint, which is yellow, like the foot-claws 
and pulvilli; femora with some minute bristles, the bristles of the tibie alittle longer. Tegule yellowish. 
Wings greyish, with the costa yellowish-brown ; small cross-vein slightly before the middle of the discal 
cell; curvature of the fourth vein with a very short appendage; apical cross-vein nearly straight ; 
posterior cross-vein slightly curved. 
Hab. Mexico} (coll. Bigot), Orizaba (coll. Bellardi). 
There is a single male of this species in Bigot’s collection and another in that of 
the late Professor Bellardi, in Turin. The female is unknown. At first sight this 
insect has the aspect of a Conops. | 
