904 CHARLES PAUL ALEXANDER 



occur along running streams (T. vernalis [0. S.]) or near cliffs ( T. auripennis 

 [O. S.]). 



The immature stages of the known species are usually spent in moist 

 earth. In Europe, T. immaculata (Meig.) was reared by Beling (1879:47) 

 from larvae taken beneath decaying vegetable mold in the bed of a 

 dried-up woodland stream. Other specimens were found in old horse 

 manure in beech woods. De Meijere (1916:195-196) found the same 

 species in decaying leaves and other vegetable matter in wet spots near 

 the banks of streams. T. schineri (Kol.) was found on August 19 in a 

 wet spot in beech woods, where the larvae were associated with pupae 

 of Pedicia rivosa in damp earth beneath 'debris, adults emerging on 

 September 6 and 12 (Beling, 1879:47). The only American species 

 whose immature stages have been found is T. inconstans, described 

 herein. 



Tricyphona immaculata (Meig.), the genotype, as described by De 

 Meijere in the paper cited above, differs from T. inconstans as herein 

 described in the following points: The antenna bears a very short terminal 

 papilla instead of the two very long ones in the local species. The small 

 lateral tooth on the mentum is not mentioned nor figured as appearing 

 in T. immaculata. The anal gills are short and with but a single con- 

 striction. The pupa has the pronotal breathing horns small, kidney- 

 shaped, the outer margin rounded. The fore legs are a little shorter than 

 the middle legs, and these in turn are somewhat shorter than the posterior 

 legs. The skin of the abdomen is very delicate, with crossrows of very 

 small spicules, arranged in numerous irregular transverse rows, at the 

 posterior margins of the segments, about seven such crossrows being 

 present. 



Tricyphona inconstans (O. S.) 



1859 Amalopis inconstans 0. S. Proc. Acad. Nat. Sci. Phila., p. 247. 



Tricyphona inconstans is an abundant species thruout eastern North 

 America. It has been recorded also from Europe, but the latter records 

 are almost certainly erroneous. The writer found larvae of this species 

 in rich mud at Larch Meadows, near Ithaca, New York, on May 15, 

 1917, in association with larvae of Rhamphidia mainensis, Pseudolimnophila 

 luteipennis, and P. inornata. Adults emerged on May 27, 1917 (No. 

 52-1917). An account of the association in which these larvae occurred 



