CORDYLURA. 349 
They are rufous in colour, thus differing from the majority of the European and 
North-American forms, which are usually black or brown. 
The three Mexican species may be distinguished as follows :— 
1. Third antennal joint short, not longer than the second; scutellum with two 
bristles. 2 ew we ee ee ee ee ee ee Sr evicornis. 
Third antennal joint elongate, much longer than the second; scutellum with 
four bristles 2... 1... ee ee ee ee 
2. Thoracic dorsum rufo-testaceous (larger species) . . . . . . . «ss. rufina. 
Thoracic dorsum brownish (smaller species). . . . 2. 1. 1 6 ee eee (BiCina. 
1. Cordylura brevicornis, sp.n., ¢. (Tab. IX. fig. 1, head in profile, .) 
Rufous; ocellar point, two lines on the thorax, incisions of the abdomen, and tips of the hind femora, black ; 
. third antennal joint short; scutellum with two bristles. 
Length 6°5 millim. 
Head, including antenn, proboscis, and palpi, pale rufous; front as broad as the eyes, slightly enlarged 
towards the vertex; ocellar point blackish; face somewhat whitish ; oral margin with a pair of vibrisse, 
laterally with a short bristle. Eyes reniform. Antenne short; second joint slightly prominent, with 
a bristle; third joint ovate, not longer than the second; arista black, distinctly plumose. Proboscis 
short, with broad terminal lips; palpi bristly at the tip. Thoracic dorsum with two blackish lines, 
laterally with some bristles ; a single sterno-pleural bristle *. Scutellum with two long bristles only at 
the hind border. Abdomen slender, cylindrical, slightly enlarged towards the end, shining, rufous, the 
base brownish, the segments with black incisions; fifth segment with a pair of scaly organs beneath; 
hind margins of the segments laterally with some long and fine bristles. Legs slender, pale rufous ; tips 
of the hind femora blackish ; tarsi brownish ; femora and tibize with a short pilosity and several bristles. 
Halteres pale rufous. Wings greyish-hyaline, yellow along the costa; small cross-vein distinetly beyond 
the end of the first vein and a little beyond the middle of the discal cell; third and fourth veins very 
slightly curved and parallel; posterior cross-vein straight and perpendicular. 
Hab. Mexico, Xucumanatlan in Guerrero 7000 feet (H. H. Smith). 
A single male specimen. 
This species seems to be closely allied to Cordylura lutea, Loew (Dipt. Amer. Sept., 
Cent. x. 75), of which the female only is known; the latter, however, has the third 
antennal joint black and the thorax without stripes. 
2. Cordylura rufina, sp.n., ¢. (Tab. IX. figg. 2, ¢; 2a, head in profile.) 
? Scatophaga reses, Gigl.-Tos, Mem. R. Accad. Scienze di Torino, ser. 2, xlv. (sep.) p. 34. 
Rufous ; abdomen and legs densely haired ; middle and hind femora with black tips ; scutellum with four bristles. 
Length 8 millim. 
Head rounded ; front deep rufous, broader than the eyes, with parallel sides ; face and cheeks pale rufous ; 
oral margin with a pair of vibrissee ; eyes rounded ; occiput blackish in the middle. Antenne rufous ; 
second joint bristly; third joint four times as long as the second; arista brownish-rufous, distinctly 
plumose. Proboscis and palpi pale rufous. Thorax, scutellum, and abdomen rufous; thoracic dorsum 
testaceous, with indistinct stripes, laterally with some bristles ; a single sterno-pleural bristle. Scutellum 
with four bristles—one on each side and two at the hind margin. Abdomen slender, cylindrical, densely 
* Sterno-pleural bristles, one or more, are found on the triangular inferior part of the pleuree between the 
fore and middle cox (see Osten Sacken, Essay on Comparative Cheetotaxy, in Trans. Ent. Soc. Lond. 1884). 
