854 CHARLES PAuL ALEXANDER 
Coloration biackish; abdomen dark greenish gray. 
Pupa (Plate XLI, 181) attached to old larval skin, which in turn remains attached to 
rock surface. (Just before pupating, the larva sticks itself to the surface by means of its 
saliva.) Pronotal breathing horns cylindrical, a little swollen at ends. Sheaths of append- 
ages dull and black in color. Leg sheaths attaining end°of fourth abdominal segment. 
Dactylolabis wodzickit (Now.) 
"1867 Rhicnoptila wodzickii Now. Verh. Zool.-Bot. Ges. Wien, vol. 17, p. 337-354. 
The species Dactylolabis wodzickii was first found in the high Alpine 
region of the Hungarian Tatras, at an altitude of from 6000 to 8000 feet, 
in a region frequented by the wall creeper (Tichodroma). Here the 
adults and the immature stages were found together on the granite cliffs 
where water dripped continuously, supporting a considerable algal flora. 
Associated with the species were other flies, Izancalus virens (Scop.) and 
Clinocera fontinalis Hal., as well as Tvricyphona schinerz (Kol.). The 
degenerate wings of the insects prevent their flying, and they probably 
live and die close to the place where the eggs are deposited. One fly was 
observed laying her eggs in the masses of algae in this situation. The 
larvae live in these masses and pupate in them. 
Larva.— Length, 12.5 mm. 
Width, 2.4 mm. 
Dorsum of body dark greenish brown, with dark longitudinal brown stripes producing a 
- curious pattern of straight and convergent lines; ventral surface almost white, unmarked. 
Body depressed, flattened, abdominal segments divided into a narrow basal and a much 
broader posterior annulus. Head capsule (Plate XLI, 185) compact, massive. Mandible 
showing but a single inner tooth. Posterior abdominal annuli with two long setae on lateral 
margins. Spiracular disk (Plate XLI, 186) surrounded by four lobes, the ventral pair longer 
than the others; these lobes margined with darker chitinized lines and provided with fringes 
of moderately long hairs. Spiracles not described, and undoubtedly overlooked by the 
describer. 
Pupa.— Length, 12.5-13.5 mm. 
Width, 2.6 mm. 
Color brown. Pronotal breathing horns short, cylindrical. Wing sheaths ending opposite 
middle of second abdominal segment. Leg sheaths ending beyond middle of third segment. 
Abdomen armed with rows of spines (Plate XLI, 184). 
Dactylolabis cubitalis (O. 8.) 
1869 Limnophila cubitalis O.S. Mon. Dipt. N. Amer., part 4, p. 229. 
Dactylolabis cubitalis is a local species, often occurring in great numbers. 
In the gorge of Fall Creek near the Cornell University campus this species 
