269 



Denning: Trichoptera 



Fig. 10:36. Male genitalia of Rhyacophila. a, chandleri, lateral; 

 b, lineaia, lateral (Denning, 1955). 



deposition, and immature stages of a closely related 

 species, fuliginosus, are described by Denning (1937). 



Family SERICOSTOMATIDAE 



In North America the family consists of but one genus, 

 Serico stoma, containing six species. One species, 

 S. ariseolum (McLachlan), is quite abundant in certain 

 streams in the arid parts of Arizona and California. 

 The larvae have not been described. 



Genus Sericostoma Berthold 1827 



There are six described species in this genus in the 

 United States. Only one, S. griseolum (McLachlan) 

 1871 (fig. 10:34a) (widespread), is known to occur 

 in California. 



Family HELICOPSYCHIDAE 



There is but one genus in this family, and only four 

 species in the genus. The larvae have distinctive 

 cases that resemble snail shells (fig. 10:3e). At times 

 they are very abundant in the slower waters of clear, 

 cool streams. 



Fig. 10:37. Mole genitalia of Wormaldia pachita, 

 lateral (Denning, 1955). 



Genus Helicopsyche Hagen 1866 



Only a single species, H. borealis (Hagen) 1861 (fig. 

 10:34(7) (widespread), is known from California. 

 Another closely related species, H. mexicana Banks, 

 should eventually be collected in southern California. 



REFERENCES 



(A bibliography to 1944 is given in "The Caddis Flies, 

 or Trichoptera of Illinois". 111. Nat. Hist. Sur. Bull. 23: 

 1-326, 961 figs., by Herbert H. Ross, 1944. References since 

 that time and additional references are given below.) 

 BLICKLE, R. L., and MORSE, W. J. 



1955. New and Little known Polvcentropus (Trichoptera). 



Bull. Brooklyn Ent. Soc, 50:95-98. 

 DAVIS, JARED J. 



1949. Two new species of caddis flies (Trichoptera) 



from Washington State. Ann. Ent. Soc. Amer., 42:448-450, 



2 figs. 

 DENNING, DONALD G. 



1947a. New species and records of North American 

 Hydroptilidae (Trichoptera). Psyche, 54:170-177, 



3 figs. 



19476. New species and records of Nearctic Hydroptili- 

 dae (Trichoptera). Bull. Brooklyn Ent. Soc, 42: 145-158, 

 11 figs. 



1948a. New and little known species of Nearctic Tri- 

 choptera. Psyche, 55:16-27, 7 figs. 



19486. Review of the Rhyacophilidae (Trichoptera). 

 Canad. Ent., 80:97-117, 28 figs. 



1948c. Descriptions of eight new species of Trichoptera. 

 Bull. Brooklyn Ent. Soc, 43:119-129, II figs. 



1948d. New species of Trichoptera. Ann. Ent. Soc. 

 Amer., 41:397-401, 6 figs. 



1949a. New species of Nearctic caddis flies. Bull. 

 Brooklyn Ent. Soc, 44:37-48, 10 figs. 



19496. A new genus and five new species of Trichoptera. 

 Jour. Kansas Ent. Soc, 22:88-93, 5 figs. 



1949c. New and little known species of caddis flies. 

 Amer. Midi. Nat., 42:112-122, 11 figs. 



1950a. Records and descriptions of Nearctic caddis 

 flies. Part I. Bull. Brooklyn Ent. Soc, 45:97-104, 

 7 figs. 



