854 Charles Paul Alexander 



Coloration blackish; 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 wodzickii (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, Liancahis virens (Scop.) and 

 Clinocera fontinalis Hal., as well as Tricyphona schineri (Kol.). The 

 degenerate wings of the insects prevent their flying, and they proljably 

 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. — I;ength, 12.5 mm. 

 Width, 2.4 mm. 



Dorsum of body dark greenish brown, with dark longitudinal browTi 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, t-he 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 (0. S.) 



1869 Limnophila cubitalis 0. 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 



