TRICHOPHTHICUS.—HOMALOMYIA. 331 
slightly pubescent ; abdomen elongate, the first segment longer than the following ; 
tegule unequal; anal vein not reaching the border of the wing. 
1. Trichophthicus crenatus. (Tab. VIII. figg. 10, ¢ ; 10a, head in profile, ¢ .) 
._Trichophthicus crenatus, Bigot, Ann. Soc. Ent. Fr. 1885, p. 282°. 
? Lasiops mexicana, Gigl.-Tos, Boll. Mus. Comp. Anat. di Torino, viii. no. 147, p. 107; Mem. 
R. Accad. Scienze di Torino, ser. 2, xlv. (sep.) p. 28°. 
Hab. Mexico 123, Amula 6000 feet and Omilteme 8000 feet, both in Guerrero, Mexico 
city (Hl. H. Smith). 
Nine specimens—eight males and one female. 
To Bigot’s description, which is taken from the male only, may be added :—In well- 
preserved specimens the grey markings on the thorax are always conspicuous; they 
consist of a trigonal spot on each of the posterior angles, and a lateral spot, which is 
posteriorly prolonged in a line reaching the root of the wings. The metanotum is grey. 
The abdomen is elliptical, long-haired ; the first segment is black; the other segments 
are grey, with a handsome black marking, as indicated by Bigot. The underside of the 
wings is very iridescent; the small cross-vein is distinctly beyond the middle of the 
discal cell; the terminal section of the fourth vein is twice as long as the penultimate 
section ; the posterior cross-vein is straight. The length of the males is 4 millim. 
(Bigot gives 4°5 millim.). 
The female specimen before me is in less perfect condition: it is a little smaller 
(3°5 millim.); the pilosity of the eyes is inconspicuous; the thorax is cinereous, with 
indistinct black stripes; the black marking on the abdomen is similar to that of the 
male, but not so well defined, more in the form of detached spots; the wings are 
clearer; the posterior cross-vein is more perpendicular. 
HOMALOMYIA. 
Homalomyia, Bouché, Naturgesch. der Insecten, i. p. 88 (1834). 
In this well-defined genus the eyes are naked, contiguous or closely approximated in 
the males; the arista is bare; the abdomen is more or less depressed, in the male 
elliptical, with the first segment elongate and apparently divided into two; and the 
under scale of the tegula extends beyond the upper. The wings have the anal (sixth) 
vein abbreviated and the axillary (seventh) vein roundly curved towards the anal vein. 
1. Homalomyia canicularis. 
-Musca canicularis, Linn. Faun. Suec. p. 454 (1761)*; Fabr. Syst. Antl. p. 3037. 
Anthomyia canicularis, Meig. Syst. Beschr. v. p. 143°. 
Aricia canicularis, Zett. Dipt. Scand. iv. p. 1573 *. 
Homalomyia canicularis, Schiner, Faun. Austr., Dipt. i. p. 654°; Reise der Novara, Dipt. p. 298°; 
Bigot, Ann. Soc. Ent. Fr. 1885, p. 284". 
2u2 
