900 Charles Paul Alexander 



Both larvae and pupae live in cases on rocks, often in very rapid water, 

 and the larvae are very pediciine in appearance. Mating takes place 

 on the stones along the streams in which the larvae live. 



Antocha saxicola O. S. 



1859 Antocha saxicola O. S. Proc. Acad. Nat. Pci. Phila., p. 219. 

 1859 Antocha opalizans O. S. Proc. Acad. Nat. Sci. Phila., p. 220. 



Antocha saxicola is a common fly, which may be mistaken only for 

 a Dicranomyia but is readily distinguished by the very prominent anal 

 angle of the wings (Plate XXXIII, 48), an uncommon feature in crane-flies. 

 The milky-white color of the wings, and the very long, straight sector, 

 are noteworthy characters. There are two distinct color phases which 

 may represent distinct species when better known. The gray form has 

 been described as A. saxicola, the red form as A. opalizans. 



Genus Dicranoptycha Osten Sacken 



1818 Marqinomijia ]\Ieig. Syst. Beschr., vol. 1, p. 147. 



1859 Dicranoptjicha 0. S. Proc. Acad. Nat. Sci. Phila., p. 217. 



There are about nine described species of Dicranoptycha, six from 

 North America, two from Europe, and one from Africa. D. signaticollis 

 V. d. W. (of Java) is a Libnotes. The immature stages are spent in 

 rather dry soil in open woods. 



The following key separates the local species of Dicranoptycha; 



1. Large, wing over 10 mm.; wings deep reddish brown, the veins with short golden hairs; 

 Rs elongate, nearly twice the length of cell 1st M2. [Proc. Acad. Nat. Sci. Phila., 



p. 217. 1859.] (Plate XXXIII, 49.) D. germana O. S. 



Smaller, wing under 9 mm.; wings light gray or yellowish subhyaline; Rs shorter, about 



as long as or only slightly longer than cell 1st Mi 2 



") Bodv coloration brownish gray; wings suffused with gray. [Proc. Acad. Nat. Sci. Phila., 



p.' 21s, pi. 4, fig. 1.3. 1S.59.J (Plate XXXIII, 51.) D. sobrina O. S. 



Body coloration pale yellow; wings pale yellow. [Proc. Acad. Nat. Sci. Phila., p. 500-501, 

 pi. 25, fig. 12. 1916.] (Plate XXXIII, 50.) D. winnemana Alex. 



There are three additional Austral species that may occur within the 

 faunal limits considered by this paper. Of these, Dicranoptycha nigripes 

 O. S. and D. minima Alex, have the tips of the femora blackened; 

 D. tigrina Alex, resembles D. sobrina, but has the abdomen conspic- 

 uously cross-banded with brown and yellow, not uniformly brown as in 

 sobrina. 



