CHARADRELLA. 341 
CHARADRELLA, gen. nov.* 
> to Dad 
Head broader than the thorax; front of the female as broad as the eyes, that of the male a little narrower ; 
face perpendicular, longer than the front, in the middle deeply excavated; facial ridges sharply projecting, 
inferiorly slightly curved inwards ; vibrisse just at the oral margin, which is not at all prominent ; some 
very short bristles above them on the ridges. Eyes bare, elliptical. Inferior part of the cheeks equalling 
one-fourth of the longitudinal diameter of the eyes. Antenne inserted above the median line of the 
eyes; basal joints short; third joint very long, lying down in the facial groove ; arista finely and long- 
plumose over its whole length. Proboscis with distinct terminal lips; palpi slightly enlarged towards the 
tip. Thorax quadrate ; scutellum semicircular. Abdomen elliptical (¢ ) or ovate (2); third and anal 
segments with marginal macrochexte. Legs long, proportionally strong, with some weak bristles; foot- 
claws and pulvilli elongate in the male, Tegule large, the upper scale much shorter than the under. Wings 
broad, longer than the abdomen, without costal spine ; third and fourth veins divergent towards the tip 
of the wing, the third slightly curved ; small cross-vein before the end of the first vein, and nearly on, or a 
little beyond, the middle of the discal cell ; anal vein long, but not fully reaching the border of the wing. 
As the fourth vein is not curved, but runs directly to the tip of the wing, this genus 
is included here among the Anthomyine; on account, however, of the presence of a 
perpendicular row of macrochete on the hypopleure, before the halteres, it would not 
belong to the Anthomyine in the sense of Girschner’s system of the Muscide Calyptere 
(Berl. entom. Zeitschr. xxxviil. p. 297). 
Charadrella seems to be nearly allied to the Australian genus Pygophora, Schiner 
(Reise der Novara, Dipt. p. 295), which likewise is distinguished by a deep facial 
groove; the latter, however, has the arista bare at the tip, the tegule small, and the 
third and fourth veins parallel. 
1. Charadrella macrosoma, sp. n.,¢ 2. (Tab. VIII. figg. 16, ¢; 16a, head 
in profile, ¢; 164, head seen from in front, 3 .) 
Yellow or testaceous; thoracic dorsum infuscated with grey tomentum and four blackish stripes ; abdomen 
posteriorly black; antenna, palpi, and legs brown (¢ ) or rufous ( @ ). 
Length 9-10 millim. 
Male. Head pale ochraceous ; frontal band with a yellowish-white reflection; hind orbits white. Antenne 
and palpi rufous-brown ; arista yellow ; proboscis ochraceous. ‘Thoracic dorsum brown, whitish-grey- 
pollinose ; before the transverse suture with four distinct brown stripes; scutellum rufous, at the sides 
blackish-brown. Abdomen with the first two segments yellow and somewhat transparent; second 
segment with a black dorsal stripe, which is enlarged posteriorly and extended laterally into a narrow 
margin along the hind border of the segment ; third and anal segments shining black; the incisions of 
the segments silvery-white. Legs blackish-brown, the base of the femora and the knees rufous, the tarsi 
black; foot-claws pale yellow, with black tips; pulvilli whitish. Tegule yellowish-white. Wings 
greyish- or brownish-hyaline ; second, third, and fourth veins clouded with brown at the tip. 
In the female the head is of a brighter ochraceous colour; the antenne, palpi, and legs are rufous, the tibia, 
especially of the hind pair, sometimes infuscate, the tarsi, however, always black. The abdomen is not 
transparent at the base and of a more rufous colour; the black marking is less constant, the third and 
anal segments being seldom wholly black, but usually with rufous portions, either laterally or at the 
front borders; the black dorsal stripe on the second segment is usually absent, but the black hind border 
is often broader ; in some specimens, on the contrary, the black portion is reduced to narrow hind borders 
to the segments ; the silvery incisions are seldom absent. 
Hab. Mexico, Northern Yucatan (Gaumer). 
A very large series of specimens 
* yapacpa, groove. 
