904 CHARLES Pau ALEXANDER 
frequent open woodlands and shrubbery often remote from running water. 
C. delicatula is apparently a more local species than C. flavoferruginea, 
being more frequently found in mountainous localities. 
It should be noted that C. cndivisa is a synonym of C. flavoferruginea 
O.S. The remarkable variation in the venation of this species has been 
discussed by Alexander and Leonard (i912). 
Genus Rhabdomastix Skuse 
1889 Rhabdomastix Skuse. Proc. Linn. Soc. N. S. Wales, ser. 2, vol. 4, p. 829, pl. 22, 
fig. 15 ; 
(Subgenus Sacandaga Alexander) 
1911 Sacandaga Alex. Ent. News, vol. 22, p. 349-351. 
Rhabdomastix is a small genus, including seven described species. 
The group is close to Gonomyia, but the male hypopygium has a very 
different structure and is of a distinctly primitive type. The subgenus 
Rhabdomastix, sens. str., which occurs in Australia and South America, 
has greatly elongated antennae in the male sex; the subgenus Sacandaga, 
with four species and a race, has the antennae short in both sexes. 
A key to the local species of Rhabdomastix follows: 
Cross-vein r present tho weak; veins issuing from the small pentagonal cell ist M2 sub- 
parallel; basal deflection of Cu: at the fork of M; body coloration grayish; arctic species. 
[Goniomyia (Empeda) caudata Lundb. Vidensk. Meddel. fra den naturh. Foren., p. 267, 
pl: 6, figs Ss 18982)" (Plate sxexXcXaVil 963) 2 er aie ne one R. caudata (Lundb.) 
Cross-vein r lacking; veins issuing from the hexagonal cell /st M2 arcuated; basal deflection 
of Cu under the middle of cell /st M2; body coloration yellowish. [Sacandaga flava Alex. 
Ent. News, vol. 22, p. 351-352, figs. 1-3. 1911.] (Plate XXXVI, 97.)...R. flava (Alex.). 
Genus Gonomyia Meigen 
1818 Gonomyia Meig. Syst. Beschr., vol. 1, p. 146. 
1869 Goniomyia O. S. Mon. Dipt. N. Amer., part 4, p. 176. 
In the genus Gonomyia there are about seventy-five described species, 
which are well distributed thruout the world, being found on all the conti- 
nents and on many of the oceanic islands. The writer places the species 
in four subgenera — Gonomyella Alex., Gonomyia Meig., Ptilostena Bergr., 
and Leiponeura Skuse, the second and the fourth occurring within the 
limits considered in this paper. The coloration of many of the species 
is often contrasted brown and yellow, the pleura of the thorax being 
striped longitudinally. The immature stages of the species so far as 
