38 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



Caloparyphus tetraspilus (Loew), 1866 

 Figures 110, 113, 116 



Description. — Mature larva: length 9.5-11.0 mm, mean 10.25 mm; 

 width 1.8-2.3 mm, mean 2.05 mm; other characters as given in key- 

 to species 



Biology. — Larvae of this species were collected on a sandy lake 

 beach under decaying vegetation and other debris at the water's edge. 



Material examined. — Alberta: Dilberry Lake, 54°34'30" N lat., 

 110°60'45" W long., June 5, 1960, Ball, Madge and McFadden, 2 lar- 

 vae, MWM. 



Caloparyphus crotchi (Osten Sacken), 1877 



Figures 125, 129, 132 



Description. — Puparium : length (specimen broken, impossible to 

 measure accurately but close to 15 mm); width 3.4 mm; other charac- 

 ters as given in key to species. 



Biology. ^ — No data are available for this species. 



Material examined. ^ — Colorado: Fort Collins, Aug. 4, 1910, 1 

 puparium, WSU. 



Genus Hedriodiscus Enderlein, 1914 



James (pers. comm.) lists 7 species for this genus in North America. 

 Only the larva of H. vertehratus (Say) is known. 



Hedriodiscus vertebratus (Say), 1824 



Figures 87, 91 



Description. — Puparium: length 19 mm, width 2.7 mm; other 

 characters as given in key to genera 



Biology. — James (pers. comm.) reported that larvae of this species 

 live among floating vegetation in small streams. They feed on micro- 

 organisms, algae, and the soft parts of plants. 



Material examined. — Locality (?) ; Jidy 1, 1938, larva from weedy 

 lake, 1 puparium, WSU. 



Genus Odontomyia Meigen, 1803 



James (pers. comm.) has divided this taxon into 3 subgenera as fol- 

 lows: Catasina (9 species), Odontomyiina (7 species) and Odontomyia 

 (14 species). The character combinations of the immature stages 

 seem to support this classification. 



