ART, 22 LITTLE KNOWN DIPTEEA ALDEICH 5 



tip of the wiiig, separated by its own length from the anterior cross 

 vein. The stigma is long and reddish brown in color, the rest of the 

 wing being yellow and shining without any brown pattern whatever. 



The whole form of the insect is much more slender than that of 

 Achias. 



Length, 16 mm., without eyestalks. 



Redescribed from a single female collected near Chengtu, Szechuen 

 Province, China, by Rev. D. C. Graham. The locality is decidedly 

 palaearctic, but contains, of course, some East Indian elements. 



Family ANTHOMYIIDAE 



Genus HYDROTAEA Robineau-Desvoidy 



Hydrotaea Robineau-Desvoidy, Myodaires, 1830, p. 509. — Stein, Verh. ZooL- 

 Bot. Ges. Wien, 1903, pp. 285-337. — Grimshaw, Ent. Mo. Mag., sec. ser., 

 voL 16, 1905, pp. 239-246; vol. 17, 1906, pp. 8-11 and 72-77.— Malloch, 

 Bull. Brooklyn Ent. Soc, vol. 11, 1916, p. 109; vol. 13, 1918, p. 30. 



HYDROTAEA DISSIMILIS, new species 



Male. — Eyes bare; front black, narrower than ocellar triangle ; para- 

 frontals on their lower third widening and silvery, Unear above; para- 

 facials silvery, narrow ; antennae and palpi black, a silver dot in lu- 

 nule; cheek narrow, hardly one-tenth the eye height. 



Thorax black, with faint brownish pruinosity. Anterior acros- 

 tichal with two outer rows larger; between are minute hairs in two 

 irregular rows. Intraalar bristles 2. Halteres yellow; calypters 

 ivory-white with yellowish rim and fringe, the hind calypter rounded, 

 not very strongly projecting beyond front one; no hairs on the 

 sclerite anterior to the posterior thoracic spiracle. 



Abdomen black, dorsum rather densely covered with pollen; that 

 of the first segment is brown; the second and third have a large 

 triangle of brown with its apex at front edge, its base stretching 

 nearly the whole width of the hind edge; remainder of dorsum of 

 second and third segments and whole dorsum of fourth subsilvery 

 pollinose. 



Legs a little slender; front femur with the usual thorns below; 

 middle tibia with several irregular rows of long hairs on the flexor 

 side from before the middle, which spread broadly to the front and 

 hind sides. Hind tibia with a dense row of long, bristly cilia on out- 

 er hind side, longest near base; on the inner side it has, except at 

 base and tip, another row of very sloping long hairs. 



Wing sub hyaline, fourth vein straight, third bent a little back at 

 tip, ending in exact apex. 



Female. — Front 0.34 of head width near vertex; ocellar triangle 

 entirely shining, short and wide; parafrontals anteriorly becoming 

 wide and pohshed black, which continues down to about the level of 



